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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 fl-y-djx4vgkbx2j 1zw8tu 7 dj7ux 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 states t6 mevz76m/pnt hat 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 pnv+6 0szyrd2ggi/zl1 roduces what kind of change on the in02nrs zv gd/6l g1yzi+duced $emf$, 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 tlz3e+lu7co,mm7qt 7j9 -rof h he magnetic field through a loop of wire produces what kind of change on the inducoe 97hm7+ fqoz-mu, clj r3t7led $emf$, 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 changc5mntmlp6* lsge 9 h3bd+( ,c:g/eikfe on the indu5g(+3cp ,n dkbml*c fes6 l gm:eih9/tced $emf$, 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 a magnetic f182hwdc9x0o / odgx 2ezodqk 8ield 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, tqt-ra kylo4d 2g c62l2gr )c7bhe direction of an induced current in a conductor will be that which tends to produce which of the foll2cd7 bg ro6)-g24ratkc2l yql owing 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 horizontacj: z; xdo1 poo51q3x, hhrou2l table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aooj, 2uhcrh; 3zo11o 5xdpxq:bove)

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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 table. A+y 2 (uw-lcvwj bar magnet is held above its center with its north pole pointin(wuwv 2l+-jyc g 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 the magnetic field vector bj z; )m1pe(g:cxk,)-gwkb ucpoint )-gb k :eguxz 1wp,j)k;bcc(ms straight up. 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 lk7 2*e n)hvt3+rxq bwqqqcglx*6 uy3 4evel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe 6q )h3*qyvwl*gn xk 23 qc7u4rextqb+n viewed from above, what is the direction of the induced 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 topj(-hzch,dk 5:qm tv,qsw c8q1 in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currentt,h8c, ds vwqczjk:5(qq-h1m in this coil 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 lnp 0b.01th xp:ha y2ltable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eithep0 ahhx0 :1ln2b.lpy tr 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 ajc)xjg 62u svax44 c,r loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fr,r4gcx6jsx2acju ) v4 om 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 about an ay uocx*hknr 6h) 58,zexis whose ce5z),68* un yrxkhoh 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 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 constarnduyev47 4d /nt angular speed about an axis whose direction can be varied. In a region where a unid r4/v 7nu4ydeform 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.tm;3l+pyk9yxudu (k pg u5 -i5 py7uz*7l/ ihi
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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 th xp);w w(dfjt5at 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 fiek- +zheupvj0w5a o3;xld. 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-westprp8-lr jv,wrc. + dka5y1w9n1i tr2x direction) is moved northward at constant velocity through a magnetic field that points straight down. 15xjwv2p yltrrrk ar,dic8-w+p.1 9nMake a statement concerning the potential 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 rovlyn )c5dvl b)u q3q.(tates at a constant 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 generator transfor ik; 0)ahi3mqsox. v1mms

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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 frequenzpo imaz ,5;6ccy of thc;,z 6o5zipmae $emf$ 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 devicebj t:aqjwh ij: 6pz :fe:d*d7: 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 devix/+cfwx lp.; kc2ist9 z:n-yp qzgh;2ce 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 loops thah/j8(u3ct pwyy)f9qpn the primary coil then it is 9 t(j hywuf)cy p38p/qa

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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 containsto9.xb-k*in l more loops than the secondary coil then it n .tio9 -bkxl*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 inpu p;8i3j;zugmp : h7djbt

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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 cirxdq2h db 4i5uve.(p2tcuit,

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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 an ideal battery of c0hm jqqwf/z0w8ui)4 s onstant termiih)zmqws/40 fujw q08nal voltage. At the moment contact is made with the battery, the voltage 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 conne+pdb pr: g)xc/cted in series to an ideal battery of constant terminabx r g)cp/+:dpl voltage. At the moment 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 ;txz2 q8,:hdpcys5u0bz14 c5lpslhq 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 a/lryqsq+(7n,gl e z4pnd 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 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 ty 0.g pp8 ju8c*1eexs/t16*u vzkimx po a battery. The time constant fox1pckumi y.j0x16gp* es u8z/t v*8per the circuit represents the time required 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 inducb9; e4 u pvlpdnca-((ztor are connected in series to a battery. The battery is suddenly removevz-pl e4au n p;bdc9((d 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 havezx2 i 7lok-e2n the 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. Oiq2ltirwx k w* 9-1t0vn 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 connected to an AC power supply. In this circuit, the cu my*6 8zl4hlw2kk4x kh ttqy28rrenkxq twl y6h2zlyktm4k4h *882t

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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 frequ;gs/ 1bd)c vumbl3zstszc 098ency is tripled9 s/g z01) 8;btzulccsb 3vmsd?

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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 across an inductor is dou1sw 7mm hk/v3gbled, the inductive reactance of that inductorw1m 7 3kmvshg/

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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 inducto:; nzlw4rsx )cr approaches zero, the inductive reactance of that coizw4 ):crl ;sxnl

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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 supu n5p)0( aworwply. In this circuit, the currentrun5o0p( )aw w

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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 what factor when z:r 0qa 2vvvc+rt8uf6the frequency is triplevr a:2vc06tv 8 ru+fqzd?

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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 acr;2m y j(5kxw. x2t dykma:1n )dckius3oss a capacitor approaches zero, the capacitive reactance of thad2jt( c;mk u5sd3nkm2x.a )i1y:w yk xt 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 capacitor c m:iffa cizzkpty2k xt.6l(9 +,z0k 0in a RLC series circuit? cpfz .x9c f6i( zz,lttaki0y 0+km:2k

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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 k5 mzx1 w5f*g(,gtwr:uvh ne-an RLC 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 w6rw1v .k3wltw8vt*z9 x ynn;R increases. When is this statemetw v8xtr.6 1nzwkww3v*n9 l;ynt 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 impe2s5 5jmwq gq7vdance of 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 impedance of the cir87tqr9d nkwma*.x0j il 8p:cicuit 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 capacitancb3npu8c1,,2exix atfy7 co / ie both double in an LRC series circuit, the ap bue, c o,fxi 8t2i371xn/cyresonant frequency 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 that is driven by an0ly n9i*i9 eha z00s.4ojs au*tbhrj+ 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 occurs w f()kcpuy (a:oa nhut/wh; ;)aw p)r)ihen

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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 inaw dwbiwu ;-*-wlbqz, /s4 sn/ a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v/bl*nz,/dubs -s iwwwaw -q;4 ector 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 ka+n;jo4;q xylba k 2+a uniform magnetic field of 0.20 T. Find the magnetic flux through the loopb j24a ;lq;n++k xaoyk 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 m is rotatingoa(1lgeatv (7 ;zx g hetm/;f.ik4j3d in a uniform magnetic field of 0.20 T. Find the magnetic flux thrla3vtizde( ag hg4(k;o.xf/ m1 e;j7tough the loop when the plane of the loop and the magnetic 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 ihkp4 1hmjkqwx+r 0u--s 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.jtlto8,p . yeipdo )p3 zf*,y changes 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 turns5y6 zlzymg5u)* sfq d/ of wire on a square frame 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 s, find the average value of the indu5*zzd5qfl sy6g)m uy /ced $emf$.

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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 tur nqg/8jq4,7v o.f: wc yg*naled*l6gcns and 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 a9ibnkr e9oy( t9c vze9q 3j/b9rea $0.20 \; m^{2}$ 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 horizontl9xbn/1k 5n.pbmkr u; ally at a location where the downward component of the Earth's magnetic fieu; l.xm19n pb5n/k rbkld 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 rotate*wt4;:r kppv ns at a constant angular velocity of 2.0 r;prwnk:*4 pt vad/s about a vertical 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-sect2.veqqrfh): x ke:o x(o-3cejtk 1.d aional 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 ofq 0lp e 0 e/r6t08 *rxp1(fb9agavdxir 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 $emf$.

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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 x capxf+d udu9fi0w*r4d;2q1c e+ v;m cm long and 8 cm wide. The armature rotates adwufudia;vx4 *; 9x+cdq+p20ferm c1t 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 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 area1scd3u5 8 svbc $0.090 \; m^{2}$ 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 simple AC generator with an ouks.y;) d vhiv9tput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is i.skh dyvv;9)$100 \; cm^{2}$, 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 widy6,pun t;vii0setk9xiiq)6 p+r 46 rth 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 motorgdq7 x-vil 85b have a resistance of 6.00 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. The moto0au (qn +it7y*p:lcldr operates on 120 V AC, ant( ql7nc0u:alpy+ id *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 a 24-V power supplh, m2ocq ( npg/.y9 95uadewfzy. The operating currenaf.po hzyu/mwg 2q(9den c9,5t is 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 1 pzsn*i5s f9kt y7 uw+cum+m3to a 24-V power supply. The operating current is 1.0 A at full speet*ysius9+w+zu15f c 7nmkm3pd. 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 power supply. Th h o3sd3mow*n,e operating current is 1.0 A at full speed. What owh3 o3,d*sm nis 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 is needed to reduce a primanzrzi k j1;0tlps.t/7 ry 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 transformer causes 14pqwcz4 ct+9o1*flz(to 8 beb( A to flow in the secondf*ozbqlc4t + bew cot z8p((91ary. 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 1 t+,mokmp*x (k10-V primary if the 24-V secp ,tkmxm*o (k+ondary has 100 turns?

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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-tur6vto0 io) 5ig(f(c6g) v72b v tbfqdinn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the fv)(7dn qcgti ) 6gitobif2v0(6o5vbcurrent 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 transformer. Assumpr l54siq-c,jing 100% efficiency, how many a pc-lri,5sq 4jmps 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 s.o rdd0xdhtnqm5h q 2qp) 16pf/(5tdqign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does th.hdphqd (fd)2 qqr0x1d q55m/t tn6poe 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 turnz f2as ej dw(wi( +.xicv/l6;xs on its secondary coil. If v6(wxza x/;lwejs(i2dic +f. 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 turm 1 v6dbxb9h pm*mhd, alm-8-ans on its secondary coil. If 120 V at 2.0 A is applied to the primary, w xdvd, lbma-mph9abh*m m16-8hat 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 10hu43f joxpg6 x5x4sh,1s ya/ w e;c4uazj.mh:0 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curr 3g5 ufjha:s1 jm/c4hz w6. hp4e ;xsuax,oy4xent 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 tur b))5lvz c2xd fd/m2v ez3qow+ns. If the input voltage to the primary i5)2/lwzxdq c+fv3 z)de o2b mvs 100 V, we can expect the output 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 1. d/my/z sns*ubk1ez(e., pu z00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the pow *u,/z psn..b1y/(kezm u dsezer 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 ll c-1f/z,vnuof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a -u/l vnl zc1,fpower line 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 d(np tl4 jbeyd6tf2 5;es0+nf of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and trant;t6 ndsfd0bjfn25( ye pel4+smitted through a power line of 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.l-2xgcjk** l g1qj*pccy9,w n The voltage is 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 the transmission line if the voltage is not stg*y,-1gcl2x n9klc cqj *p*wjepped 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 of 0.60 W. A geq, q3b+kpf zi1ss a6z3nerator produces 100 V at 70 A. In order to reduce energy loss due to heating o,63 pqk3fqz+s1a szbi f 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 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 kqopwf*,qw jck+bg 9:m /-(r25s rl 4jfxn*dilm 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 transformer with g+roq,5fxi*:n/fs lwbk4c2j(qdw- l* pjmr9a 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 1000 V. How ml dy1e4if.zcji5y * v 4tg0r.huch less power would be lost if theif4vg e0jih*y1l c tdz4y5r.. power were transmitted at 3000 V instead of 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 transe+iwee zkn4w;xd/o -fa0+,x mmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to ea+ -eemzxkwf i wne,0o4d/;+xxceed 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 . wievcj4/s,e b45w +ljy gsv/stored in the coil's magnetic field? w4sj j lgws cbyv/,i.54+eve/

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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 and an 18-H inductor. Wh5xuyes6l m 1,xat is this circuit'65xy eux 1sl,ms 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 cjk 8h9f/ zhi.+t 9kifAC circuit where the rms 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 outlet. Worn +:5v e4zij yul.i7ojp.7vhat 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 o 9fqc fz1cn9 mua*x owx;k(b+*zy(g5qutlet. What is the resistance of the lamp?*cm99*gbqzx;n 51 q +a(u kf zf(coyxw

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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 power supply. What is the peak t ;zfn fu9x. :m;ifcq;currenuqx.:n tz f;mif9;; cft through the 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 connecteg ;h(.vh c9o1 puinoki335re ld to a 120-V ac power supply. What is the power dissipatk(gino19;. hi hcve luo5r3 3ped in 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 j nv ovj8cz22/a 50-W resistor is $I = 0.80 \sin (240 t)$. 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 resiex mti.mn62bfly w 3;-stor 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 3e 3rnwgbrb oa+:)jc8gtjr2 ) s ib-/hresistor 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:7/ * z zrw0okxib,icw 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 1000 Hz?b 5kb7 fzswe3:

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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 have 14.0 W of inducti 6ar.8)hqltt -j)sme zve 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 at 1000 Hz?2x0s*htp)lzrh c6zmh3 v7on 2

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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 20 kHz 3bc6fvfc8 .wq is applied tv. 3bf6 ccqfw8o 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 110-V, 60g-u+4asaw)- j tq 6azl.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 capacit io6-b)gkyz- dor 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 capaci 6zb,pz9w; h6akk4nx htive 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 reactance of *q/(leba.xjymbg*8 p1200 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 gyk5w(tsqy9o1 mb.xp- /t6kb100 W?6 k 1kt .xgpsy(wtmo/b-b9y5q

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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 t jk95.o8p 3p) s xongd)h9atjhhrough a 0.0010-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, 1m,8 n qzhp8;ag5.0 W inductive reactance, and 10.0 W capnamzh p88g,; qacitive 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-mH co 6 ytmiifcb234g69v owm.taelyf:t 6 2il, and 1.0-mF capacitor areom 2acbtwg96tl6 y3e 64vt:f2. i fymi 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 resisb:.ddk7 42v2hyttlv ntor, 20-mH coil, and 1.0-mF capacitor are cbn 4dv7 tyl.t:v22d khonnected 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 serq k0nn+ wlxq.a4yla 19w,;6 u i/jaymjies with a 20-mH inductor, what is the imxql+yynq.a4ww/laj;uanik , 01m6 9 jpedance 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 connectehak 4ui5 jz63)vyn 7,mju,bu vd in series with a 20-mH inductor, what is the phuvh6jyuk 57vn aj,u),3 4m izbase angle 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 neededoywc3e0ux4 7 qe.5ve q in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedaeq7 uc5xey.3o4e0qv wnce 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 needed in seri5xkok kq6q(pww5v8r2 h9uc y) es with a 100-W resistor and 15-mH cxrc 52 w qkh6kp9)58o( uqywkvoil to get a total impedance 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-,o s a cdp 0( 2d1n:zvdbl 44dinl5wa3lej/wk inductor at 5000 Hz for a totap-dd wc:ks db2 1(i4a,de/jv0l l4w3nnoa5lzl impedance 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 put in series wid:qvp d oi84xur(x;lqtid+-) bukff ,3bj; /mth a 100-kW resistor at 1.0-MHz for a total impedance of 1504dlbm qpqx t-u :dd/fo)3+;kf8,;rbu(j vi xi 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 rqmuwd / 0 g3pqh;qvl5 0/e3qqseries with a 20-mF capacitor. What is the impedance ath 0 eqq5 /dgqlqm;q3w/0u 3vrp 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 forw elz,x i5h3;3ebi:l v a total impedanceb 3ixhzel:w, l3; 5vei 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 1.0 kH7i2at9d /nr bolp oe(9z for a phasalr2ipoo/7t9 den b9( e 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,(3cx0 z ni w9insfkyjf sn.ft6:- 6rg in series with a 30-W resistor at 1.0 kHz for a total i cirjssnin :w.6 6(xgf39-zk, tfnyf0mpedance 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-mF capacitor at 120 Hz. jtq9vl.)d)q -pt: aymWhat is the phase angmqv-.a9ql) : tytjp)dle?

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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 coil, anuq up8qql; -)nd 1.0-mF q);nlp qq8uu -capacitor 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 100-W reiias (79 15g-hfo5nlctejh 1a.8e wlfsistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the.ah islfa(ieteg hl1w7n51c-f o85 j9 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 .letr7 g)ah-jh:yulbux ep y )v a,4/8of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flu)p7 ha v-l hberyl.tu/g,)8e ayj:x4ows 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 gc 3se+3 7 mw7(sqnfh(ey oboq8wtd)*a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powe c8 3eb sdn gy7oqt*)fw(whem+o73 qs(r 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 zfxk07hc :f-d500-W resistor for a phase angle of :h- cdf7xfz0k $40^{\circ}$ 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 = 20.0 W, L = 200-mH, C = 10.0 mF. At what fn: ( nrjvn/9jg kz j.dv)1o*xirequency should the circuit be driven in order to have maximum power9vj jg.)nzk1*jnro nv/id :(x 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 acz7v(enwe5p t+ series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connen w+5 v(e7ptzected 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 is mu)(s+fm 6f fam;5l ql$63^{\circ}$. 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 impedanv6 xkhnyopd-c5 ua.81ce of 60 W and a resistance of 30 W. What is the powe1 -.ap8hnkud6 c5oxvyr 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 foiajv8q tqf) lwrc o/8cz7s68 8r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tol78t ws j8f roca/8i8vzq6cq) a 60-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 andtde+ph94g, hm+ lcx y6q 0yqz1im4t8r a 15-mH coil in series?tdhl 1m+cqy6 h0imz4p+ egqr,x 98yt4

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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 resonant iaja6+liyrjef*5nos/m6 .x 3 frequenc5e a3.xfro*ijilns +m6a/6yj y of 10 kHz?

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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 with a 3.7-mH i djq(m uyz y..y,tb(x+nductor for a resonant frequency of 1000 Hy(. x tuy(jby +,qzm.dz?

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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 pla8p kbd 3p/4jbzj+u ph*ced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 pp+j bkp8uj* 4b3/zdh Hz?

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