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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    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 unitsessojy0:z 86/xj 7goo 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 st-pu 8 e)6oao-fclyj3xates 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 wipi+;g qps.gvk x0 6-mire in a coil produces what kind of change on the induced -v qg0mx+pig sp.i ;k6$emf$, 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 af/c u/x(izvx;gp9 j5k loop of wire produces what kind of change on the iv pg9f/k xz5xj;ci( /unduced $emf$, 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 4(ipwcmg7k 4t0s bx(lr5v0raof a loop of wire produces what kind of change on the indul0rp(4rbkv47asi5wmt0x (gc ced $emf$, 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 f b36:fh,dsp8vrq -/vumtv r+bield 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, vaef6)pr j s()the direction of an induced current in a conductor will be that which tends to producear)e()6pj fsv 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 horiz,a2 u g(t:yhopmi/ih2 ontal table. A bar magnet is held above its center with its north u:i 2oipa,( hh2tgmy /pole pointing down. The stationary magnet induces (when viewed 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 table. A bar mag-:igcxc j;bx3 cse(4w.6wcv mnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induceb4;j xv(im we. c :3wcgcc6xs-s (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 regi-u3683w qgtn sdrt6u; mu0ggjon 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 the fwg-3 6tndgu0 8rtsgq;6u m 3juield 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 adq-qprn aa 83ln2;geuw5wcf+xmd2w(t5 )yj ( level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewe wg3yw2 aw5(e2ndln)f 5p+m- jaq;t(x r8cduqd 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 tab6o 0ynaqw0 n4 ,n*bwmsle top in a region where the magnetic field points straight down. The magnetic field disappears suddennon0n*s w,q640 aybmw ly. When viewed from above, what is the direction of the induced current 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 table and carries a3noo if: k :hz+bvb,-xn ever-increasing current northward. Two bvfohn-i3:, z bxko+:coils of wire lie flat on the table, 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 thro4kenvvump1. tj4g 1sqoep(w( tg 63qm2-4oo cugh a loop of wire with the north pole entering first. As the north pole enters tc1e 4 -2.n4ok3 opvp6uv(jttqeo 4ws q(1gmmghe 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 constant iul;2dj/+av iq;fc o:m 0 nry9angular speed about an axis whose direction cafa o:;j 0di lrqy2+u;/vnicm9n 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 constant angular speed about an axis wk+x,k..nhhpp. os49wxd z j 6vhosevow,jh9xdks6 .zx. ppn+. hk4 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 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.p .1e rqxl5vs4rg.hb/ zh1f 4-bqwhn:
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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 that an r fov;5t(guvh +q)m y9$emf$ 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 fi1g fh5 oor9pz9: ;bfrneld. 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 dire3 r+b9/p 4l( ;yu*bqt*i*yx remcze tpction) is moved northward at constant velocity through a magnetic field that points straight downrbrel/*y zxu t **im9eq t3bpp+4c;y(. Make 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 rotates at a constant angular velocitg*w4in3m fjuc/3pap1z m74esy $\omega$ 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 trans02 5cgpd6fr,htel5 1j.ixt)vs k; s abforms

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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 revolut7itft263 5 i,ycemsmcxnhp* 1; fi 6wkions each second. The frequency of the ixis5*7;fm2 yfc ntm iwe 61,6 htpc3k$emf$ 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 device used c-1lzr vvx1cnn2fn.9 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 del,:72dty6d: oo0si*gq shgqw3wa7 rzvice 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 secondaryb0zy40iu2tpz) qrb (a;- xbqn)sz*3 cknmf h6 coil contains more loops than the primary coil then its 6-a*;tzz0qz unr2cp3bnyi b(kx0m bqf4h) ) 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 loops tha x4bb za2y* 64l,ozvtmn the secondary coil then it is zazb4 2 4*l byovtmx,6a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th77vsz/ e w9x eyjld.5je power 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 circuit e kh:y6:g nue:k3olb1,

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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 connect8rbn*n0+r:e t0l fz-qjigg5z7m9m rc ed in series to an ideal battery of constant terminal voltage. At the moment contact is made with5fm9 ijz q *:nbgn7tc 0+mg- 8rrrz0el 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 conz2 gy qkq* x3kq )/iev*j7j/vlnected in series to an ideal battery of constant terminal voltage. At the mo3qli/g*y*/x7vq e )k 2zk jvjqment 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 inducta o4.at b+daz4kq8 mb5hnce 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+r1 stkp+c v3jxg nm0t 0v853gqoz5ox 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 induct9q+ oxck5zu8 mor are connected in series to a battery. The time constant for the circuit represents the timu o 8qm9cxz+k5e 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 inductor are2w7z mz6vk-d2fqbr5r n(6 gg h connected in series to a battery. The battery is suddenly removed from the circuit. The time 67vq6g h w (2 dz2g-rkzn5rfmbconstant 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 units en2i:uz)is3 cq9g ,8na ne /yjyxcept:

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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 ci ugukxi71xxx tyts/a /r;.7e3rcuit, 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 circ-r2bkg4 kw-: dokjs p0uit, the currenksk02:d jrbw-k o-pg4 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in0.jew(a m mkis.zh pf1g u+n09 an ac circuit changes by what factor when the frequency is ti0k9. gw1nmas+ h m.fu0zje(pripled?

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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 .up57wu iza5j0v0as kdoubled, the inductive reactance z 7uj505wa vuis0a.pkof 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 approacgz x ab:p u57nl71 (macd9vpq)hes zero, the inductive reactance zcpl ( adn7b5uv)qmxp197ga: 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.c)0b ibeh9;qt( zc :df In this circuit, the currentq9(0 ;bctid ehbc)z:f

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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 the freq,m18 3iq6hgwf/-cu5z3rfufhnt 6cuy uency is iu5rh tz m8u3f1y6,/wchncq ufgf 3- 6tripled?

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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 across a capacitor approaches f3jhcr nbkk7l/iux13,.),nzv xz ,csb r f.h6zero, the capacitivehxn7 ,. ,uxrirck6jv) zs h.1n bcl3f3f,kzb/ reactance of that 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 th65b j 1wg pv:yuo*dax6e voltages of the inductor and capacitor in a RLC series circuop6 y j*ug1w5bx6 avd: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 RLC circuit is go- (x2qa-gi odefined 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 icx-3er.vyb w 2ncreases. ebcw rv-y3.2 x When 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 impedanc w) fq9/jt4jzz6(zdq ye 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 circuit increasf lt3em *m7j7tes 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 ths wlshg 2x:.ef:dw-* ge capacitance both double in an LRC series circuit, the resona- elgd2:ww *s.sh xg:fnt 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 an AC applc*s wgd)zn:w3u/83ixosc6 h gied 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 occur ak t(l- *w.r/nn6ykcas 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 unifot bssn/ d/y7-drm magnetic field of 0.20 T. Find the magnetic fyds-b7tn /ds/lux through the loop when 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*lpe ds6vxnzk) u+q9x8r :z r+ in a uniform magnetic field of 0.20 T. Find the magnetic flusl)zx+nqzek 96*r rx:vd+ 8upx 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 mpl ji8 fxe+p84bal5e; is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t8xe4 ealflip+b5 j p;8he 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 looa:k1ja 6bar erz3ekxm+nj25f6 enb+7p 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 changeizb9-np05-fjcb 8s 2fbdrb -tdk q.;t s 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 frame -byk(g q-m s12q qf:nuwith 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 valueb- q:(sn-g fkq21ym qu 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 wir chor3, fwqk4+e with 15 turns 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 b: g+rscebdw a-a/5 5rarea $0.20 \; m^{2}$ 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 horizontally at a cer6.dgjdbt 1m 54ep17,uoo wlocation where the downward 5edp cj41md61ow, orue gt .b7component of the Earth's magnetic 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 rotates at a constant angular vel:9c6rim y jqp-i8)pjgr. z4mv ocity of 2.0 rad/s about a verqv)46 gm p.jr8-r:jpzm i9iyc tical 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 5./ mvrzsx* hrz:9wt d* /p+csd0 loops 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 consi:qzwkwkwm+b3:l,d i*n8 jb dp/5 bk6ests 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 $emf$.

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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 lkva ut85)lp fd 7g25lgoop 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 tl8ldpk5fvu7 )gt5 g2ahe 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 o/wbkeek7je 0 n-;gi)i(3i2 3fq nuhmm f 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 simple AC generator with an output of 12 V9*j jsq* x+csc-(ut kz maximum when rotated at 60 Hz. A magnetitxu (s-qc*zk+s 9*c jjc 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 wio/ .otz csv6i;x42epw th 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 hx kpg /m6+,pn1vacwu 8ave 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 m- +2z9yduxt;e x*ckn5huoj7;iwhy x*otor have a resistance of 6.00 W. The motor operates on 120 V AC, and when runninc*d9z +*xwtxy7 kh ;e2 n-iuoy5;xhju g 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 conny) mviy- h(nj)x f*al:ected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currennhy-*jmv) ( lfxa)y:i t?

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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 to4/asns c6 cd )h(+cd49ykcaz k a 24-V power supply. The operating current is 1.0 A at fullc/(s cdc4hyc4ks 9z)+adn6a k 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 power df lylb060 8yz7pd b:fj) mgnz. er1a6supply. The operating current is 1.0 A p0y8)l.fb7 f grmynzz 60a eljb:61ddat 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 is needed to reduce a pri5gz1uoucy6u2wro 5w df (h6k, mary 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 14 A cs+yz/ uvm0jb+u; 0zq to flow in the secondary. How many turns are in the secs0yu; +juzz+qb cmv0/ondary?

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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 iat.1dn:x g2 x8,c7rv zfsrm*are necessary in a 110-V primary if the 24-V secondary has 100 turt:a1xdr8r,vzg sn7mx 2 . fic*ns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists d klt7kuo 9a)4of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currenald)tkk o7 49ut 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 transformerag55jhc21: 4x/e)lggatj6r (a pkvcy. Assuming 100% efficiency, how many amps at 24 V can flow in the secondarr/x a j51v)geypkjca5l(ah:6 42cg tgy?

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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 transforme70 25v5pzjpek zi;drmr provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dr0;k 5 jmdzp 5zepv27iraw?

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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 p nur 84tzh.2x g9qks8erimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vol4 8r.kqs xugen9zh82ttage 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 6lt*fj9m 4 n+mf0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currej m+fn*ltf m49nt 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 an0chf+ q+j zxjib;;nd -d its secondary has 200 turns. If the input current at the primary is 10+ fcn;iqz+x0hdjj -b ;0 A, we can expect 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 transforme/ - -0bl)oggzia jlu4zr has 100 turns and its secondary has 200 turns. If tlouz-j0az lgbg)- i /4he input voltage to the primary is 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 100 turns and its secondary has 200 turns. pj/ +p(hhrtd/ If the power input to the primary is 100 W,+/hprtj pdh/( 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. a + 7jv7f5/lamb i0exg The voltage is usually stepped up to 4500 V by a transformer 5xfem0+v /ba7iga7lj and transmitted through a power 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 of current at 120 V. The e+ugep 85f.y1c ao2anvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percyu+ao85e 2.ea pg1ncfentage 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 c413- q2hh-6m.yqtik akc+z c a.s buixurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of t mqa-4zh ya.kx.ch3 +i16iksq- b2cutotal 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 5h +hzfu.gbj;9+ dut3c0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order b cu3hg9+ +zjfd.t;uh 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 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 a1 dbf*ng++:exb4rm6e 7 nw pu50 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 transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transfo*e 6dnwpgbnu7 x 4be:1mf +r+armer 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 mzk;n (7murzxd ,u*tfv 01k2geuch less power would be los(k1 r* ; d,tx2n f0muz7zvekugt if the 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 transmii.qgnbhw j/e5ib0q-1 tted on a line with resistance of 0.60 W. Tow0. qjq 5 eng/ib-bi1h what voltage must the generator output 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 carries ),z2yx n:q:of wsjxl3a current of 5.0 A. How much energy is stored in the coil's magnetic )xq 3wfjxz,::n s2ylo 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 res0x-c;9 r l:fdbl-fpwaistor and an 18-H inductor. What is this cirxf-pl-dc:wf; l ba09rcuit'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 ag)x nbcjs20 ;1qrgy6s n AC 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 int coe: udi3fb7yls-(s, o a 120-V AC 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. n :8f5ldjzwtq) c iymzeg*65 into a 120-V AC outlet. What is the resistance of the lamp? 5.m8l)qz ecjwdf6ngz t5y *i:

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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 pmse (3ho, 2bwjxro (m 5ljt+*hower supply. What is the peak current through the rethemo+l5b m2oxs*(w (r jhj,3sistor?

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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 supply. What is the power diss sq*aio:d,g6rh2 y) fjipata*yq)fo d2gi6rh:, sjed 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 a 50-W resa1;(4yzeyygf 1uyz4 sistor 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 resistor ik/ ycbdl 2ef*;r: 5fhes $I = 0.80 \sin (240 t)$. 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 resistor iesh9w(g.iwz 5,ao puae/ m1:x s $I = 0.80 \sin (240 t)$. 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 ;f gt wzc1z mp20k*m1qof a 1.0-mH 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 q1iuxb3( 6ntm3 ougenj k- 06m1000 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 have 14.0 W of inductive reactance b)lx- 4+qsf,hcgo(mu?

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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 1lqq4d12a8+xf;z 4d p8i xmzew000 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-; kjdcdj77p;o;gk 8b zmH inductor when 120 V AC at a frequency of 20 kHz is apokbcd7j;p7z ;;kd 8jgplied 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 11d pohvw t.lh e) 6vri3 j5vq3z+9 kncn.x2z)v80-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-muomk7( );4cti lwl3 yhF capacitor 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 neede a i7:k1aokmq,d 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 10q 2/w/b gifxuhjq6 +fb xu-593o:xwan-mF capacitor have a reactance 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 capacc 8l 4e)kvnw:litive reactance of a 0.010-mF capacitor be 100 W?l)c le8wknv4:

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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 andx:lgu88ufv r;b83 laz 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 circui(m6 p qhg/luvk9 bw6+rt with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacwp9b6rq / +u6 mvkhlg(tance?

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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 impedan3rnjccn2 650yb 0 ckcvce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ckcbvc 6nj 2y0c 3r50nin 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 resis dsu+oi-.77rdzk/ud ctor, 20-mH coil, and 1.0-mF capacitor are k-dorus/+u .7cd7zi d 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 series5v w):)9elmye/edsjvoc)j w8 with a 20-mH inductor, what is the impedan )oc/)ls8ew :e j 5vjew9my)vdce 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 in s55 s4evhpt3ny5); fjywkm f s(eries with a 20-mH inductor, what is the phase angle atf (ny5 3t hs;ksvm5f)e5wpy4j 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 coil and 1.th 95st3tw2ena s-hps*ai+hm uc4, i(0-mF capacitor for a total impedance of 100 W at 1500 Hz?m4s*naci+93s thih sptew 5(,t-2uah

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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 capacitancc*1 iyz ig+azep1 o)-ojug9w :sv-j.ees is needed in series with a 100-W resistor and 15-mH coil to get a totw-+syu:ozjc9i 1*g.g e zi1pva) oej -al 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 inducto9 tno xic:ref8xrc7,-97zrd cr at 5000 Hz for a total impedance of 40000 Wixo:e 8n7ctc fzrr997,x drc-?

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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 with a 100-kW resistor -wiz 8m.eog d:at 1.0-MHz for a total .-moezg : wid8impedance 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 ca kc+8j xa..pv9nnqcg 7pacitor. What is the impedan qn x.9vj8c7akp.+gc nce at 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 a e;ug,,/rf uib total impedance of 45 ,ieu/, b;furgW?

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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 kHz xm c*8ub45u n, -:j6blvgubphfor a phase angle ofu p4 bl:b6 nu-*ug,8x5bvmcjh $40^{\circ}$?

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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 1. dddo xof4(9s q2w*1xp(4pxgi0 kHz for a total2*x1(pwd4isxdpd xgfq9o o( 4 impedance 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 .ep5o3(btkp z at 120 Hz. What is the phase anbkz35tp(. epogle?

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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 .m,gh pojywl* ;9ihz/k: a xbhky6x8 +1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne hkij b; ,8zy*6polw9 m+hgxak:y/x.h cted 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 resistor, a 10.0-mF cjfm xi2 yvi3 4ynrn rd*.x767japacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whatrf47*j3d2iymx y76 j.xnrn iv 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 capacitive reactance 30 W, and a/i rbye ;6: ni9/sxl 46xdfpda:5c czxn inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powz; ps:5i d cdxa nb:9e/c6xixfy4l6/rer 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 circuir d)2h q)s*km)jv5k4mz:qevkt containing a 50-W resistor, a 10-mF capacitorv2q m j5)m)sd*e4k ) kkqr:hvz, 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 os;ti, ui/l* op4j /tv500-W resistor for a phase angle of i *4v j,slt/ iouot;/p$40^{\circ}$ 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,ooi. 2 k dm-rv5i3urn( L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order t(or idu3rv-5o2i.n mko 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 resistanc:h(l5hvqvn6t l21hhm; iwz/wcn ) no6e, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powerwh6vnhnz 62lv1/m hw) o: (cltqh5;ni 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 ci4sxf3 i 0*cothrcuit is $63^{\circ}$. 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. e35vzs0edv2b What is the pevedsvz32b 05ower 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 resistor, / knv.(f0i8pq)crm wvr/fp;4 myldz7a 10-mF cmd(/nzr pi yv f7qk4 r 0)c/mf.p8;vwlapacitor, and a 0.45-H inductor, when connected to 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 and ak8al-8r l3dze8;jri q 15-mH coil in series? 3erd8l8;8ziaqj-k lr

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needxw e7op2sti.j-+n rdc)ll/uag(6q:yed in series with a 4.7-mF capacitor for a resonant frequency oyte: 2lsni(d.ucr -/+aoj6)g7qwxp lf 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 wit7km 5z7rgq6esh a 3.7-mH inductor for a resonant frequency of 1000 Hqgz7mr76s5 ek z?

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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 resn,as68 ooc4 9 c ntl*qhkxu.n:istor and a 40-mH coil if the resonant frequency of the cils qo 84cou x.h,*nc:k96nnatrcuit is to be 1000 Hz?

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