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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 are units of magnetic flux excepei)q,yf nkfxk0.+h 9at

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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 states that.ui wy8mo 3 ;p; /xn8ucblfw)m eb3odmx;l.-x 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 7 +f9qc uypmk,wire in a coil produces what kind of change on the in,p79fqyu + cmkduced $emf$, 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 ofhlejqx(:umyv tmplzn4u8:ngcf((w-6 ( 9 u (j the magnetic field through a loop of wire produces what :gjtn u-6 yn: mhle8pl(uwj (fv(qx(m 9z(cu 4kind 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 ofw9*iw y pq9ld8 change on the induced idw*9pylq8w9 $emf$, 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 removed from x +u0w*/c xe4h 6ype2/wcrmjq 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 anq 3jxsm+w1cm8ocfbk2-cmf/ 4 induced current in a conductor willk-f j3/c fmm c8bows2+x1qcm4 be that which tends to 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 flat on a horizontal table. A bar magnet is c/+u( ts fn96w s j+indxea(6mnjlb(rmp*o **held above its center with its north pole pointing down. The stationary magnet induces (when viewe 6(*d(b( snfmrl+ o9ajtx*mpnjws u+n6ec/ i *d 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 f(ky ejp /+mhr3lat on a horizontal table. A bar magnet is held above its center ymrj /3 he+pk(with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from 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 top in a region where rsxv, kfsk3i v-(/pt0*v9q 7wjo*cao the magnetic field vector points straight ujpx 3/ s*k v7 -ritoqa,v *vs9k0cw(ofp. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the 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 hd i *5o/cljx.in a 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 induced current in ti.d ojh clx*/5his 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 magnetic fieldt v09+ezu )f 39;u+8 nf:k yplgvbqmyv.eqx:i points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this cofyq bm: e ng++u3 0v989 :;ki.zqtv)yvelx fupil as the 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 everdgvzfo+ :h-9 nl7rw1q-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When view7:+hw rz-gql9 no1vfded 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 (zzz7tm 0)xhedl dk7*wire with the north pole entering first. As the north pole enters m(x zl) *07dhetz7dkz the wire, the 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 conj bl3rym9c-bq+. :kglg, 8akr stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down3qr,.r kcb-yj8lg+m9k:gab l , what must be the orientation of the loop's axis 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 rotated at constant angular speed ab18q4zfuljdy m /qet51 out an axis whose direction can be varied. In a region where a qze/1j t5 qdfy4 lu1m8uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.-rthlkrx08 u7 np 9x)c,o cy)b
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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 thatv6y qd2,h40ttgjjxq2 c ;53yxn qd+ bm 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 ai+ 9vxt:;gki(epn h q- magnetic field. 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 noru6u5s p*ihv g:vrb c-+thward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pusprv5u- cgbv+h* 6i: otential induced 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 constant angular velocityuymkb6 ofk2l,,h * a1l $\omega$ 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 generator tranjj)s dktb, 6ungd9 .5e n,;mjd .pae.msforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The ala+;yt es o)3w;q8 tifrequency of tayoqtt+l a)e3sw; i8; he $emf$ 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 deyg +eg0(r c-bam +(rmon,6 laxvice 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 devim,rbeo(5 j9*w +us.ue a1 hzbnce 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 i2ga .2a,xwcq secondary coil contains more loops than the primary coil wg.a,2iqxc2athen 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 prf3k x kl-g+ta;imary coil contains more loops than the secondary coil t3fg+;kx-a ktlhen 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 powe3t4u cvh*k k0q 3sj8lhs +h*oa 6x6bgfj5tjq,r input

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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 c ;8ujyfj p2qio-v g3hwyol*+4 ircuit,

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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 induc4g xa./ m w/bstb;gus 3lh,1fetor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag/t ;lxsew . u3hs gm4bbf,1a/ge across 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 s(.v9wrokfh0kx c9 7jconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vof hx sc j9o(.kwrvk079ltage 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 wbne w6w)9b ;ilced;e: d3 c;phith inductance L and resistance 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 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 resistance R is connected to an de79ulmbcoq 3 243 z9o)xirtt$emf$. 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 series to a battery. pb(n5zvwc)s. The time constant for the circuit represents the time requirew5b .psv)zn(c d for the current 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 batte1w9b -e.oiou gry. The battery is suddenlyuow9 .eoib-g 1 removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease 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 the same u)7 b0;fvo ytxvy p7;dcnits 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. On this circuit, the cur1( 5btsz t ccqbpj: 66whr5v(srent

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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 connected to an AC power supply. In this circuit, the currevik8uk(73hxm n(kkux7hvi83 mt

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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 freqsofba108s. .tzyl6ybur3 se2uency is tripls s 6 .bl 2yzau3r0b8tf1eo.ysed?

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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 voltagepl.8z6(7d(qveva+w 9m x pn pa across an inductor is doubled, the inductive reactanc qvwp d 6zxn9l.vma( ep+a87p(e 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 across an inductor appr/ b00-ro bwq0q3eexo coaches zero, the inductive reactance of that coi 30oe xq00eco- wq/rbbl

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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 cw 7d7r 6ssvos4ircuit, the current4r sv76o7ds ws

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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 changes by seu 3s 6gq )bs(/cc p2vwn.k6jk(q0dt what factor when the frequency is tripl3e6k wdqcp.jsu qsvg sc)k(b2(0n t6 /ed?

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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 acros(kt llt0)sb3t3s +ttas a capacitor approaches zero, the capacitive reactance of that c3t)ts+0 b tta(s3kt llapacitor

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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 vor- jm2v 5k.ko8 y(j dywtu,,koltages of the inductor and capacitor in a RLC seriesuj,5y(kvwro kyojmt2-,d8 .k circuit?

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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 RLC pq,pigs pu03- 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 i2 uug: fsatiab.4z6o4f R increases. Whenb.a26 fz4a iugs :to4u 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 of th8s cu0sz8p8 2 lf5fmfrwkj:9 we 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 impedance of th*howj(5mjeum+lzugs;0 hm0 ; e 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 capacitancr3 k61bue*3 zy 9ivsvre both double in an LRC series circuit, the resonant frequencyu16vi3rvy*sb9 ek3z r of that circuit 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 /mfb2/ e.alexr)a) nfthat is driven by 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 occurs3nd;mbg e :dw l8yo6qa iz4f10 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 radius 0.10 m is rotating in a uniform magneaq **murx*b3gu *z .vltic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parall* a. g*vm3q*xbruu*z lel.

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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 unifunbi0vx q 3ullijbu-*,3i6z)orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and i6)i,3ubxu 3znqb-uj0li l v* 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 m is rotating b c*wy;wqm80prz a ye 88f 96y5eryip0in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnw;0ci qrpe w86y zaeyy* 8bpf 09my8r5etic 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 area of an adjustable single loop is reduced fhh wrg 76+cs5,gp -xzorom $1.0 \; m^{2}$ 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 changes ff g0y y6c7o*d,qg tx1arom $4.0 \times 10^{-5} \; Wb$ 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 5to,4crr;8iu i2-fmbdu w/ehframe with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 si/ 4brd;5cmh-r,u e 8ou2 witf, 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 anvxh1av 16yx2m g;o5jm d an area of $0.40 \; m^{2}$ 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 ar*m p/uykljm4(a:re x*ea $0.20 \; m^{2}$ 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 flies horiz+--kfcdz7o :s1sf z zfontally at a location where the downward component of the Earth's magnessd-zf1zfokf c- z+: 7tic field 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 rotates64p0 ie10;jdrujxeuyey z) m3 at a constant angular velocity of 2.0 rad/s about a vexzpude0ey j3 4e10y;mu )ijr6rtical 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 loo8lwv5l*.v tll -m+ zwqps and a cross-sectional area of $0.25 \; m^{2}$. 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 10hvewep703 hjwi x9e0gr5ur430 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 $emf$.

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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 l* gz j20snaxtry,sq 9t69s ws0oops on its armature. Each loop is 12 cm long 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 ofsrst,2*9sz0 t aq0 wg6n yxsj9 this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arrg fsw l4*gj.a56sm8q ea $0.090 \; m^{2}$ 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 simpg gaa;6:k/ t 0 /qtw06g u.ku;woj5x/nhvsuanle AC generator with an output of 12 V maxim/vg/ 0n.;uhwk56qngaaaswj :t; /gkuu ox0t6um when rotated at 60 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 with a mx97bi0fry px vpavao ,:b0)g+bxe1r7 aximum $emf$ 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 t8le / bveemye/ax5 )c2k*pw.W. The motor 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 motor have a resistance of 6.00 W. cw*k +mv lry mwl(v i83l6q:)8;rv:gnpmjtw; The motor operates on 120 V AC, an:t vv;8w+8p; qyvl *milrnm6w jgcrl:kw(m) 3 d when running at full speed it generates 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 a2./ej)l 619uvtpn3;q e(v wc pmeqcnp 24-V power supply. The operating current i3e.1m6pl nejcqwtn9(2q v ppv;/ ec)us 1.0 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 connected to a 24-V pgh8w/m f3gcgn: k7tf-+;1e + l ptgcacower supply. The opera:geak+ 3hgm/ l c7+fnp;fggcwtc-1t 8ting current is 1.0 A at full 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 po)o35tryvwd7 swer supply. The operating current is 1.0 A at full speed. What is s7w 3dvo)t r5ythe 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 is needed to reduce a primary voltage of zysnh)u z. q( p;3o;k/od ay;u$120 \; V$ 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 transformer causes 14 (p03jgw n iz7+c iu ,y6uybw/dA to flow in the secondar7nicy b(,j 6uipdw+wyu3zg 0 /y. How many turns are in 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 primar9uza,40aerosw b ,c;bjeu9ii;o ;p9 my if the 24-V secondary has 100 tur wu4z ;9ei,j ;9o,am0;soiabrbe uc9pns?

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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.8jrawyto b1y l3r ib27,x z ;.nm2sdbt8qjo* primary coil and a 2000-turn secondary coil. If tyawdbyix8 lr3 ;jz o. 8.t j27,br2qtnbm1so*he current 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 iw+3v nhokc*m0y1w,3sje0x qfn the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in +,fc okmnxqes031vh3y w wj*0the 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 at 10.0 mA. The wni 1 qrn2 -pq ,.v8kk rdemp5nt2jf69primary coil operates on 120 V. What d jvi wkrn1ek-2 n.rtf8qqp5nmd9 6p,2oes 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 colh-jd d8dz8o: pht8(3 o, cprdil and 300 turns on its secondardpd ,8r o-h(h z8jtdo3cpd8l :y coil. 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 primary coil and 300 turns on beq7tjdosco ) 8 6gi4/its secondary coil. If 120 V at 2.0 A is applied to the prima7gi tse4q6bjo/8 ocd )ry, 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 +raph9vj38( oa7t stk secondary has 200 turns. If the input current at the primary is 100 A, we can expecttpt8sokvr7a aj+39( h the output current at the 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 turns and its secondary has 200 )2izn c /;fuh.q-hyya turns. If the input voltage to the primary is 100 V, we can expect the output voltage ;h n/yf)z-2y huia.c qof 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 transfwz2os 5 :fq6 /vbx)xlformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 fx )ovxzwsfq :5b6 2/lW, we can expect the power output of the secondary to be (neglecting frictional losses)

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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 usually lq1s,r:5 sjgv v2h+jwstepped up to 4500 V by a transformer and transmitted through a power li,jvjr: sl hsgw15q2v +ne of total resistance 1.0 W. Find the number of turns in the secondary 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 5tvml e (kg26phz )8wwis usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in (6lekm w) t2g8zpv wh5the 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. 7 woa,g:n )iipThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a powe:7in p)oi,g war 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 lo)mnlu5qj d32b)p4 ux/s - ruvine 50 km long has 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 tqp n/um)d l-u)4ovj3rux5 s2bransformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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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 has a total resistance of 0.60 W. A ge 1e u6x-dyypm9nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissiyyde9px u-m61 on 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 used?

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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 16b+j -s mznvr*000 V. How much less power would be lost if the power were transmitted at 3000 V instead o msr+ n6zbj-v*f at 1000 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 trx e rmvoi-(ow1/j*lj)ansmitted on a line with resistance of 0.60 W. To what voltage must the generator outpu- i)e 1o(worjlm*xvj/t be stepped up with a transformer 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 carrie3)x+e p8xy cr4kir6(cm.ms) rq7gfy ds a current of 5.0 A. How much energy is stored in the coil's magnetic ycr+.m(y3x mgp d 68ir))ce4srk q7fx 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 an8svh j/;;tkbzo5w+mrmxg )6 wd an 18-H inductor. What is thi) b6jsxhzm /vo ;k5r 8+gww;tms 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 rms1w u)mhn-7kxm2au8 j k9/4bgyat, tsk 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 AC out p.ws :c8vx bhbni2t0w(.3xq)t nwep)let. 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 into a 120-V AC outlet. Wv /(pq)fu 8 12pg ppaacdb(0twhat is the resistance of the laqw /8 )(bdpac0upfpap21gvt( mp?

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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 po8*qbpag2hg g7 wer supply. What is the peak current through the resistog2 ag8g* h7pqbr?

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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 supply7buz ,eu d s3;hv*wui-7uf 7lo. What is the power dissipated in77 wuue3-ozdf lh;v7s ,uu*bi the resistor?

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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 is rzdgdtdl4iq9l7 02b 4$I = 0.80 \sin (240 t)$. 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 resistor / fwt9l)g4sad 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-W resistor6ox lk2ybhya z 9*4me* 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-mH inductor at 60 Hza+7s de /fz(ps?

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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 reac fz1*774hlxctfd vrmvk;w0.atance of a 2.50-mH coil at 1000 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 aebo 8:i-s18 ty/ (kbdqd3a ova 14.0-mH coil have 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 au j;b-p(xky*k* brq y3t 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 frequency of 2. :91 3 c.g,pew jsw;ys 1ldbu)lwmjog0 kHz is applgljo1m9ps3c:djes1. u;ww ,bgy wl).ied to it?

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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 xf,mu6xz g2e (110-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 capacitor at 10 kHz?ics;ju9qe0 a3

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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 9 t grbfxby :k2fctd 9vw-gsj9:wlo 8 xe:4+z1needed to have 50 W of capacitive 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 reactanc7xab(/o gsqt0e 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-mF capacitor be 100 77pgj1org:2pbu1 ) iwou, h zsW?2 wo7hiupz17 )sj:,gp1rgu ob

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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 0.0010rjh6o 9,bc k9n-mF capacitor at 1000 Hz and 5.0 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 with 12.0 W resistance, g*lu v)qiu)zd he +9f9 ve;o+m15.0 W inductive reactance, and 1+;9+ g)e uz)hivev ldm*uf q9o0.0 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 a 100-W resistor, 20-rdi- x ol 5mlk127:gk 2dzp5qsmH coil, and 1.0-mF cakl xg15 57sd :zq-kop2m ird2lpacitor are 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 y.p8fea ;ed f-Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa p-e8f .fy;eadcitor 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 series with a 20-mH inductor,9hzn-;sos vc l0h-yj6 what is the impedance at n svs jyh6oc-0- 9hlz;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 in series with a 20-mH inductc1dowz605z c.hkhye z)x *kw/or, what is the phase angl zkzy56/h0w.)hwk c zxe* co1de at 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 .ef59roxthhfaci5 fy* s 9 :o0coil and 1.0-mF capacitor for a total impedance of 100 io0yfh r.:atcfeo5sx 9fh9 *5 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 needed in ser(kk./ j:vo : nl:)4ff:bm: kcbiuhsapies with a 100-W resistor and 15-mH coil to get a total impedancea:bu h op n/ :4bk: :k.)mivlf(fsc:jk 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 seriesg ms7 gh6z42p:* 8thxek ;z jq5izdk.a )kjse) with a 450-mH inductor at 5000 Hz for a total impedance of 40000 mq:2 k.z*d) k54khj g7x;8 aeisg z j6hpzste)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 b 0yh/baxfec :u gr21h+e put in series with a 100-kW resistor at 1.0-MHz for a total ichx+:f/1 b2u0aegryhmpedance 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 series with a 20-mF capacitor. W::h*7cd25xzt c dqhyx hat is the impedance a h*xqtdh 5::zx7y c2cdt 1000 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 aw+z xy;kwl7ca :/x g2d 4mti+t tota++akz;m7yc :dx tw4/ l2xwi tgl impedance 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 048mcp y/bmrm,dbd:rfd.a 4rmxyzgt-9 tp: 5 series with a 10-mF capacitor at 1.0 kHz for a phas 0 mzc: ptmmbx94-r/bfad: dt.5r4m8r pyy,gde angle 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 w jewow:*m xh(o.7j/ty,s)ayoith a 30-W resistor at 1.0 kHz for a total impedance h/) ooyj.m so:,xw ajty* 7e(wof 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 .eq uca1n. g9kw)5 ,n:mi wrjnseries with a 100-mF capacitor at 120 Hz. What is the phase an.ea,. :)kqw nwcm5nnrju19 g igle?

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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 5.0 V and 1500 Hz if a 100-W resistor, 20-mH .swz+oa- hny/coil, and 1.0-mF capaci+hyan zw-/s o.tor are connected in series?

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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 consists of a 100i1ug,,oaystarg 6 .4 i-W resistor, a 10.0-mF capacitor, and a 0.350-H r4 ,gu 6soiag.a1,y itinductor. The circuit is connected to a 120-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 capacilat:y7 )3fm w*xt5w hztive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series t a)fm*tz 3xy 7ww:5hlto a 110-V, 60-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 RL1l*b, c:p8b3tmkppk 9c u/jf oC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 8l *1b,k3c :9pcpoputfk b j/m60-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 necessa i6uj xe k/7/zs*+vjsury in series with a 500-W resistor for a phase angle of 7u*viues// s z jjk+6x$40^{\circ}$ 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 R = 23.q x5 4gmmq v.k/r xbnxc,pk7bxdz 0;0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the ci xvkr.3;nxkq70 x4dp q b mmz/b5,cg.xrcuit be driven in order to have maximum power transferred 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 circuit with 12.0 W cdk w +;iqgl0c6b/gnakayn1d/3 pq*-resistance, 15.0 W inductive reactance, and 10.0 W ca +y* ;b3dgcanqlw0ckg6ik/-qn1p/d a pacitive reactance, when 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 isrn hjwi1nqs /*n 1,a/qjoo5w3 $63^{\circ}$. 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 W and a resistance of 30 W. What i rz(( r;glvmdf,ob 7(ks the p odgrv,l(rm7z;(bkf( ower factor?

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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 series RLC circuit containing a 50-W resisgvk*6tc:g+tn th-(4 . bhwxgbtor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po4. t g:hw hg*bxt nvg6-+tckb(wer 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 capacitnw7rf5)8is3u +zbo i nor and a 15-mH coil in series?wn+i8o 53fr7)n u zbis

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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 capacitor5c-bs d wgh02n:dkda 6 for a resonant frequency of 10 d6:5akhgd wb-2snd0ckHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nebh6 4b bsl+ 9w5fa,hhgeded in series with a 3.7-mH inductor for a resonant frequ , hl4bahsb9+bw5fh6gency of 1000 Hz?

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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 wba lyx s4x/2:lcy6 6h gidkh2f-xz34 in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzidxlybk 6- /2: a2y6wsgx34hx l hz4cf?

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