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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following ardyaytvv4;((z e units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction svas,dtpse tl4 cd 1:g(urk. 3-tates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on tnnuwj4 6vc -c*:miizi,9o1qj he c zmniqj9w n,16ciu-voj4:*i induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a lo5c(3 fn+g:(u0na .14otfjajel6pyn t ts :fw sop of wire produces what kind ( 0en6 fs ::(ttnfftjwpl5n.1a3yjuag 4co+s of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the in2er;1w((4fyo5)up tytizont q s n*o 0duce((;w0)tryizut1n y5 o 24t oo*fse pqnd $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removeddo 3a-.mobch4 from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curreyebkow,wi x ha3acp p)7o 69*:ybs;*wnt in a conductor will be that which tends aab peyk* 96w:,w3 hw)p x*yo7ocib;sto produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fy/e;.d 11)u/ nze9p*glww.fyzlb fw qlat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when view f;w.lel wz9p1d /y/1g*.n)eqw yfbzued from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tv b )+ j0-k/ff/1s bte5aaivpoable. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fro//1iv)+ ko0 5pbjs -tfaa efvbm above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table t;i36 i wndbi3mop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as mi i6d3 ;i3nwbthe field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a 1+bp/gvqu+)6qgf+ prsnp y *u region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the indsup+*unq+fyg1)/gqv b p+6p ruced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the mtdyq 3w 9h-oc4agnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as thedq- o yc4w3t9h field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing cqs;xse)fl lw *3yz3/jurrent northward. Two coils of wire lie flat on the tabq/e 3s*wlf )jzs;lx y3le, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fiykjy.yadea69jy82y:h 8 2wjirst. As the north pole enters the wire, tyijd6j y8yak:h ja8.29wye2y he induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abou 2bggr/v)gz3b;)xlj5l:h hyz t an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axisz 3r5;j )gg :lg2x)y/zbb hhvl of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is z2kr gv;)u 3 7dboib)i 0ioiy7rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation kiv7 u0 bd i3)grooi7zyb)2 ;iif the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.;7 m 45duznoo.5i9ee2dq: ylwg r* fec
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways thw5sel:+z;rw+kv b1 tdat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. oxqp 6r/nx:,faa h8d1 The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved n e:7 vfy-jvmslkdh;:6 orthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential ind mh6 :j-dvky7 esf;l:vuced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a co9abmu ;mmb q78fkxew3d m ,-v-nstant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorv,7iun 4riwg6jz)9 d+ 5gwp un transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotasd gv/3rp5)6c7liq retes through 60 revolutions each second. The frequency of the 7c5v3r/sp l6ri qd)eg$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devkm3ey:5dqpwb ;86 xatice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicm,zz /754aecqiicnqcp( 0t*g e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loog iv p*df*ar0mn4*8pouh j23hps than the primary coi* uo4d20*mi83* nhf rpaph vjgl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loop3f5jffqba 4c-a8g/u 1h7 omwq*t1j hl;n b+nds than the secondary coil c-f bw7jqb+mh nga/t1o8h jdna1q;f *f534luthen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpu82y1jddo1r ; ogokf9: yvg- ikt

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circui2 6 zedzayb vb-s-hg4r 7qf*3jt,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to ) h fifoi3cq(3xq8 aj*an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros xhi(q j 8aof*3cqf3i)s the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ofml;cf0aw owg-r )h :v: constant terminal voltage. At the m : 0ma)o:wlwfcrv g;-homent contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R isgm 7k9b ,dnh;kivq2r 2 connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resist xkmvx .nx,1y,doy0)iance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in syi 7n33 fufhh4eries to a battery. The time constant for the circuit represents the time required for the cur37 3ufyi4 fhhnrent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batt tklc*r2rqs*, 1zv 2 ep,nsf7nery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreas1l,q*t2v7 * zfe,cr r2spnk nse to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the1nhfxa: 4as uvk.l f i;yw./0v7zcsc- same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. Og9c w9r/)s ywuzfyab2p(r+u 8 n this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is conne8n zpgi56 rsc,byi; 3rcted to an AC power supply. In this circuit, the currenip; gr, bn5c83rizs 6yt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the bovq8csc2k:c;*adl( op ;6 mffrequency is tripledkfc;q (* avpc; ol2osb8:cm6d?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage acroso(kvnsvz9n xtj)u1ahz9f9,; s an inductor is doubled, the inductive reactau,nk szh f99 v1)9o;xnj(vzt ance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acr/ y9,z( zpfqziy2 xe+;c8tpv+f7s l,j (fsesx oss an inductor approaches zero, the inducti8s jsf(sz(pfqcx++/fz epve9;izx,yly 7t,2ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the currx/0yg tbn9y 2wewy/ b2xty90 ngnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit .,*a 6pfpx,fw lz na1lchanges by what factor when the frequency i. wlan ,p*1pzxf 6fl,as tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acrosayo e+61z h6jus a capacitor approaches zero, the capacitive reactance of y1u+6 o6e zjahthat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitzem+t j0sm67jlsl- ;aor in a RLC series circu; lzjmaj07mts -e sl6+it?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an zi 4i1 tpohm)4tc;j7yRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R in05,wkjl0o 1k e,qqxqa dpwb(i6yje.9creases. Whenkw ao,lkp0.( iqb qq9 yjj1x6,d we0e5 is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance oza w0:x3d agi2:spjl (f the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedsxr.8 xltc ,)u0iom6d bab9j+g: 5uqlance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the ca eqy8o8j3wdm- q7sj.xpacitance both double in an LRC series circuit, the resonant frequency of that circxo7dj 8q -3qmes.wy j8uit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven bxqlq02r s1h y e80lw0iy an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit o y2t0(ane7hulv9 lu86l db0da ccurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of ra* .*vi iq*l:nyy4)/t 2tbl ueo, ztevsdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whebuzoeyl v)q, / ityl.2eti n:**st*v4n the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a u,8w8w t ju9bya.;for xp t9.qqniform magnetic field of 0.20 T. Find j x;t98opau f,.qwtr9w y8b.qthe magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 mt d5 ,3ul-*w ( v frbc*x)hmhb9dzzhw6 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag*xt z,wudm c5hhh dw 39lv-(zbrb)6 *fnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional ar d2;km8lrml9vuy 1hy (yc0dm :ea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chax5k+ +4ykgsng3 beef mnmanb,54*ys4 nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square framoqw+uv k:5 u9te with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chantq kuuv+5w o:9ges uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area o lki n dn,lcgole-5sb5 zq4(19f $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a a4 +6gm q-viw)yuh fv5+n5zvsrea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m n 1ks+fece)b/flies horizontally at a location where the downward component of the Earth's magnetic fienefs c/b1ek+)ld is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocitv;4/dxwq zh1f y of 2.0 rad/s about a vertv/fhqx 41; dwzical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area ofvvk0r m9-awp2 $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi xj/w;t-ca i1qtbv ),cre of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm 8/hpnax,t(a 2, 81u zbcpvbdwm d(wb6: zd6kylong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this gener(cm uv1d,2d dzpbw:abwxz8hnp(ky66a 8bt , /ator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consi2.ngmed,fj t.+h u1gjkq)os 0sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a sim)lvjx0ob. 4mj,qsh-4l) d;,ap kk9qjcx r:epple AC generator with an output of 12 V maximum when rotated at 60hr p x.p9lkjx);04jls)oca, be:4 vjqkqd-,m Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator witwh5b7k cdc//r qy53 rwh a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mkto0d5t6sztleza 7wp1k4s 1 4otor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motorgrad eh ;3: f *d0sw5cd+ybln+ have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generate 0nd yfcbsg+3:;*rd+h5delwa s a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to astne( tzy )s w i:u1.n3,wn; zzp9*fcy 24-V power supply. The operating current is c)3 .zn;yni*(u9wyws :tf1n,e stzzp1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connect;*kn 3fnmt )oned to a 24-V power supply. The operating current is 1.0 A at fulm 3tnn*of)nk;l speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power9hc/26- nxwqgf4 gxu l supply. The operatinw c2 fuxq64hg n/lgx-9g current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer x8fi 9kz8l sp af9:+jxis needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transforl2xmnz k()vqyrl11:2 a jq. nqmer causes 14 A to flow in the secondary. How many turns are in n2mnrv. k(aq1x 2j1 qzl:yql)the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the )6ah0u+g4npo0bfuwc1 9nu*n mpgr i5 24-V secondary has 100 turnshnn5g 0 upw uuc+16o09fp*b gra)i4mn?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a zy+z4b as ni*.,+ileq2000-turn secondary coil. If the curren4b s*.nz,+zyali+qei t in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer9 htr93wk3 a p)kwso.f. Assuming 100% efficiency,)3ohafrwp9w ks. k t93 how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V atd-xueq (,cl1y 8u ,u nwshl;g: 10.0 mA. The primary coil operates on 120 V. Wh-1 lsd:u,cu 8,gyl(equhwx; nat does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns 5r7p8+z w(dcj0petz d;b1s mxon its secondary coil.z0sdr p7wc+m z(;dbe8p1x jt5 If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its epu;e4vpq e y/sx m/la9e)t -.primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applvupee/-/ lymqe4ape;9 .x )stied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. npei,g6zdjdw 7wb gbbpi:+y9 :c2ykm/ ) 7:anIf the input current at the primary is 100 A, we can expect the output current at w e7ibdc kija6 7nz9dbgw/p) :, +gm2pn:yb:ythe secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnswfomxqtv8*a3f u-vhd 8ou51 ap: /dc* and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output q*8 fuut8xwa * :c1f vdm3op/havdo5-voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns/t r9)g3jy xvoj;a/zkqx 2f5 r. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losseyg v2zk9xafxorj j)/3 5tr;/qs)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is m-svju/ ondjzw h vxf1-s+1 ,9/0ehzousually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondaw19 so--ujs/ xdmz 0vf1,j /ho+henzvry if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuaa6pwswy/z- . irs5ik8,cpa:j */ jwually stepped up to 4500 V by a transformer and transmitted through a power line o-, paiu w s/w8jaw.a p:/r5z6jikcsy*f total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage i/cla4ct6.nv sb6s )dxf+t m-v s usually stepped up to 4500 V by a transfora/s t6lf)mn . s t4-bcxcv+6dvmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ofo(d;vimsat ch+2 e; 5k p+oi;h 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not di++ (h tm;ac ohe ;vp2;kosi5used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long haspwp,:b -wr;5 xaw i/co a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is upwcwp;a5:o rxw-/,ib sed?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wyt6))bd + j1eavcsh k2ould be lost if the power were transmitted at 3000 V instead of at 100s2c)j hd )tvay61ekb+0 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on5dt r onkd6k9/2 x(epfrtk.gri1 vf97 a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformno .9 k ge tf(dt rir192vrk5x7fpk/d6er if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in thegp5lqx43ql:wnq3u n, coil's maglp4nq :35,gxqu3wlq nnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor ah occ:bw50. icnd an 18-H inductor. What is thio.c hc50bicw:s circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the zal1q/l8 7+ecw u; y/x.x jwytrms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V ACz.wj6) l qr/-cf q,lzuj*er v+ outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed intoo57i :xccet*z a 120-V AC outlet. What is the resistance of the la*otc5cze x :7imp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powevr5yjespz1* lo/zgv k,p0;7.wl( r oyr supply. What is the peak current through th(e y/sk l*y1, 75wpr.0vzgr opj ov;lze resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power-jj *f2cfrn+jn3g+ q sq onld930jzf-5 mjte4 supply. What is the power dissipated in the resis+l0ff zfqjnms93jjg2-t3 -rj*n dnq+ cj e 54otor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ibckx-vuh giojw; g a/w3d8 /d:8v1x(ss $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto*i,+5 19 l ubzq p2wh.tftctwlr is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-gw- pbkg7c iyq0do u26ld:,i3W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mz,+0spu kavt3H inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10nk+1*1 ltovj;9 wcqj5y,mrn q 00 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil ha6j5zvyr n9+pq ve 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance a6 -/uzpm f4ftat 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a e w4ofh 8.qty4) v+ysgfrequency of 20 kHz is applied to i yves 4g4f+.tw8hoyq)t?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 11 ug0evvu :7 c ek-r joqycmxa74+e797t0-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacif fjyx2qmhi2 /o05so7tor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capx1 remimf,g (s 9:e7aoacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactanceyzoq +e+/ +fxbcfp2x4osu 1 pv) b30nc of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mFhf4 z0jlj0ye5 capacitor be 100 W?0hj5 0fyej4lz

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.pl5k /mh82s(tr6djbu 0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with1jcusy2eq8e 5z emu6 qr dksv16 w,9q2 12.0 W resistance, 15.0 W inductive reactance, and 10 2 dvq1u,2ey z6wuc rk 1m89ejss5e6qq.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if /2pk cy b -i/y-5cxgfya 100-W resistor, 20-mH coil, and 1.0-mF capacitor arei-5p/ykx -cc y b2y/fg connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W ren6n(pdtr :4:o/m .sxqq ws0p ksistor, 20-mH coil, and 1.0-mF capacit/:dp:w nq snq p0o4x. sm6trk(or are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in jc66ppiler0s z ,c b1zq2y89vseries with a 20-mH inductor, what is the impedance6890 zvcq16ys pcrz l i2jp,be at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected/qyrlq4xuoko)0b) q1 in series with a 20-mH inductor, what is the phase angle at qryqo qb 04x)ku1lo)/1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH cog6hnjerx-,f u 7q/4w3 iza5voil and 1.0-mF capacitor for a t4j6f 57ig/xve z-ra,o3n uq hwotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is need.g9:a670v rodzcm ur ved in series with a 100-W resistor and 15-mH coil to get a total impedanc9mz6orv a. 7dc:uvgr0e of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for az*l typj(h2i/ total imped(j/h*py 2liz tance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be pu0tn (1jmlb lr6xu/4gx 1ebk 2ut in series with a 100-kW resistor at 1.0-MHz for a total impe (014juuler6n2 kgm/xxblt1bdance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in seriesrbwt,68*odyg2mpzf l:jje, b;p+l gc g5 16xb with a 20-mF capacitor. What is the impedance at 1000 ob28p6yfj6 e:mwlx1dgb,p*;g ,g5 ljbr ct z+Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for b;n7e 8t5l1o) ebeqr ca total impedancol7b5teb q8)1ec; n ere of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at-l92tcn:ir rqdg fb.) 1.0 kHz for a phase 9).-qfrctid2nbrg: langle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 01 tw,nrfb3jeyof 95o1.0 kHz for a total impefbw 50,3rn1jyfeo to9 dance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100- eac)i2ky4xi) mF capacitor at 120 Hz. What is the phase ane)4a)c 2k ixyigle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0scr * zbv1n8nz*hz-g.1jmsb6 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series? znc*zsnms6 bh*181-r vg.bzj

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit d2kt 4wlq403 ne/nqpmconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 44 wmnklp tqde0/3q2n120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacit0tmq7 w2 nftvbk 5)9w :vpzqz*ive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 6nvw2pq v tz k9m0fz*wb5: )qt70-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, v3es g(: b;*pwao(6uk xdge/n a 10-mF capacavu6ke3o: ; (wgp( gd/n*bxseitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a ,fh5k-, crh1 jx+mgmc phase angle of 5 + rhfj,cm-1kghcm ,x$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has g -tz dn)a11jitkx /c0lq209rtjz6cn l) ali 7R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferrktl -cgai0t6 2xj jzc 1taq zd)1r/l9ln) 0in7ed from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series .d;bzpeqcoa1olbs y58sq82v/4r 1 kc circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whenycq5 2o/4q p sd8za;kebc.11blrsov8 the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit ikbd2 ncm+ 2qb)s $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 Wc7wz:k5(k-g q vvj9h f and a resistance of 30 W. What is the power c jwf-k5 hzgvv(9:7q kfactor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a se ndfx +rc-2l +i3kv3p gh/bi2eries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6 3dpeif-2l+ghrnb2k3ixc +/ v 0-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH co; m*5u2azov19o ypf mlil in series?vm5l2;oy m1opzf 9a u*

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a reso96 l zyyr;rdtyo1o7 g2vy0 cq*nant frequency of 10 7rotd*zrly q 2o0yv1 cy; g6y9kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series withtmdf:q3kht x )34y4 y;llw6ah a 3.7-mH inductor for a resonant frequency of 1000 H4)yf:l wkq ylx6mha tth34; 3dz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH +)4tt9ikbz o/l45wvw4 da stqcoil if the rsiz9b 5l a+)odt/wvt4q4w4 t kesonant frequency of the circuit is to be 1000 Hz?

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