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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 unitse dw l pq *y;-9zphriuq;9/g6b 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 states thatbb akyqfgi/r03x1(l *d tc1:k 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 of7 ael91-rx uz4 irnzx4 loops of wire in a coil produces what kind of change on the inducedaz-49rr1x ei n4 u7xlz $emf$, 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 fi5gf7hb+oi jre. b f(p.eld through a loop of wire produces what kind h5g(bbf7of.prie+j . 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 loo0 t6qehoo 0tg3p of wire produces what kind of change on the inducedo6 teo00tgh3q $emf$, 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 field amb -p) mt6h0:.k wkxqhn $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductrl )b5q6 (.w: 7a8f mpcx2v;yxazpnmb or will be that whia nmb fpa:rpqwv5)yxb l zm86(.27cx; ch 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 barxx*cj 3 t/, fpn0t6ebwqy8/ td magnet is held above its center with its, 6e/t cy3xw/t n8bp*dtqx0jf north 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 bags v0 kok(rx;1/.ashvr magnet is held above its center with its north pole pointing down, and released.kvg0ss k.v( /;rxo ah1 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 cz96 7knpme l(o8quq: 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 aspql8ec7(ko9q6: num z 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/ ) 8g1b0c hurnfyv(pe top 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 this coil as the field increases?ghuvpn/ ( )yr b1f8ce0

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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 hori /ij3s*ndax: v 6xh9+yux9silzontal table top 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 current in this coil as the iav93:*6ydxixs h /j+lx9 nsufield 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 car6mu-c* s/tghc ri8;d ugh-w o,ries an ever-increasing current northward. Two coils of wire lie flat on mro*d--;suhc6 g,t/cw uhgi 8 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 through a loop of wire w4 925xwm qy 0norui ol16v,ufxith the north pole entering first. As the north pole enters the wire, the induced currentuyr5 9lqio42n1fx 0 xow6 v,um 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 wi1y+b+; an;6k xp uzzb vtithx;35 dwv2re is rotated at constant angular speed about an axis whose direction can be varied. In a regionazzx1;;n +; tkbdi2wpy+ 6vhb t3 ux5v 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 constan:,5 bivbi * n,eyfj3edt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tyebv*j 3:f5 ine,di, bhe 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. ysl-8/ c9ih1-vt8mhr ddbra*
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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:ch0;t4uiw+( evjwj k at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The7z;(y( wr6ouh;w zeib $emf$ 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 northwye3rh;zte)4zd - c vs-ard at constant velocity through a magnetic field that points straightzz hyev c4-t)ds-;r3 e down. 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 ve22 +b,llg/ dmc 0ohlsllocity $\omega$ 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 tran(p- 32:uvr1lqh/bwb*kv g fb esforms

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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 freq.66f lavppm ,quency of ta p.fvpm6l 6q,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 device used qjoqx;za -t16 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 devxn xcc io7tnme.:y6jc+7 *j j:ice 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 than tj4 csc )dc8zo9zwh)4v he primary coil then it is4coc4s)z9hd wj) zv8c 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 than the secondar- u2u6xyufj grz;kt,/ y coil then it iuk/-, yx2urz; gt fuj6s 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+kn2bq+bt 5ww; l-qgj 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 circy:c7 han0 /egxq kr+6fuit,

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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 ide/-8j *ojiqzcb al battery of constant terminal voltage. At the moment contact is made with the battery, the *iqo8 jj/- czbvoltage 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 connected in series to an idey c3(l+y5h,j 19 iob7 uzvvqneal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor i,7veuoy(qbj1z+i3 n5lcyv9 h s

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to af g/ sxog98lzum ,cd2/n $emf$. 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 c7emp3jo qg :i5onnected 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 to a battery. The time cta. - *iz,e 5ybzu,qkt q;eip;onstant for the circuit repaii-zq p*qe ;y;,5e bt,uzk.tresents 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 inductor are connected in series to a battery. The battery i;foyccl x.iah+5yl ts3 m;p8 zfp.4j7 s suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curren;yy pccz;osl pmix73f 84at5hj+fl. . t 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 excepmtmkw 2,ej73 t)y-yym+ mkd p,t:

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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 ucc8 ih.4a,wnthis 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 circu.) 7+y9eq bq0 keegxmiit, the currentqkq+mie b. e 0y9ge7x)

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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 thevrwa)/s7 wnazlkm kj5:w* l :4 frequencyv47klj/w:a5)w k lnwazr m* :s is tripled?

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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 doubled, the iqs.wfzior ybq;6, - 4anductive reaq f.y4;wb6osz aq r,-ictance 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 inductm*ypon6ud l5cpxv- d(8-*tx e or approaches zero, the inductive reactance of thatteyno5cm pd- * 6p-u l(v*8xdx 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+zw.p1 ll,6gnqiou:9 yw59ho it(sgd supply. In this circuit, the currenl(nd phq. uso9lot5:6,i9g ygzw w i1+t

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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 wh) phh x3cxe03oat factor when the frequency is triple)0 phhox3ce3xd?

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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 voltagerc tb1 jz ;)7z2osi8s6 qyi1q41sljc p across a capacitor approaches zero, the capacitive reactance of that capacqlj qrjs6cbt;ic2p1s 7s )1yzio84 z1itor

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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 capue*rxu y8r t4kc k8 yj71;tw)iacitor in a RLC se47er8j t tu;k1)k*ux8yi rwcyries 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 c;/n pf3vv w omuv2t-j-ircuit 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 *igsm*ca h gg3j0+hc u)qd:q: if R increases. When is this statem c0:js+*:q 3qgmhga i*hdguc)ent 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. 5j 059d ixm7v +dmjwpj The impedance 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;xie3 mw;bm )y. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circe88gsk,y(f xkm90imy uit, the resonant frequency of 8x(fksm9e0iy 8ymk,g 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+/ky.qs9z exj 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 occ)gwz 9b7g c1ynurs 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 rad42 7 eef8o nf l5en/,1xw v2fpbo1a-ajj rwoc;ius 0.10 m is rotating in a uniform magnetic field of 0.20 T.jc1w faf-/2j;vb27o8nn la1wxe5 e,fop r eo4 Find the magnetic flux 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 in ;bq ,h6+gocqra uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loh;q+ ,6 bgrcqoop 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 rotating in a uniformx8qeqd)l8jj xx69 r52 i kolwro-71xr magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop 27w5ox- 6x ior8ll 1djqqj)xe xrkr98and 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 area6jslwnfuz +-d96: vcb of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil cha-ah0sb1k;kf k nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.c+cv ;q:6brpk bv )*dy 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 c +vqck vpd )*:6b;rbythe average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arp b.embwdwxk *73:0n k kkrg9/ea 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 are ah81x l.xcr-axlzj(+a $0.20 \; m^{2}$ 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 locatio9vf( bywxuo,:j 6,w ,pztay:i n where the downward component of the Earth's mp owxyy,u(,bj6zit,av:9w : f agnetic 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 constau* )bv2a9*ju6pk3cu ( zuk babnt angular velocity of 2.0 rad/s about a vertical axis througua )2zp3 u*uc bjvbak*69bk(uh 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 loopsaodsy)xroh6,-vpa )r;z(o f0 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 dk 6jpoldk(709i r1lq100 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 isinchnj t+ 5f0, 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the litf0+n nc5j ,hong 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 consist0j5 hrmmnmk f- kw7 d1(.4a,zzypb)uus of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output0sy k.r :,qfvg of 12 V maximum when rotated:0q.rg fy,sv k 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 max07wj yn9+sx;z jl3hce imum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates qx1/n vqb7fmi6:qi2 p,f,3hl9quzm v 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 resistanceulz0v;3ec4bt ijx;dga ,r -y7 of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bda zj4;y-,iu7rl evct3b g0x;ack $emf$ 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 resistancesxp;9e9l7k mp 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr ek9sx97 m;plpent?

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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 conn( 7ro*0xpuajt()u:r m m2ayojected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t p o7t*jomrrya: uj)x 2(0(aumhe 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 tu*x35dd0ych.g2i a ay 18aenj o a 24-V power supply. The operating current is 1.0 A at fun2y5gxaaij* .1e hdd8 0yauc3ll 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 reduc:hus4tjz-l s0yon4i- u+ 4hri3 q3fqx e a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 q gx y u ix5,ov3kx,dy::k(fg-A to flow in the secondary. How many turns are in-g5xiu,, 3(xxkyg odv qyf k:: the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if theo fwnj)u ds) 3h6 s(ic128;q hc3oggsr 24-V secondary has8;r noq) (wgi hu)3hofcj21c36dsgss 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 ofjplb c 5t.hl2: a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary .tp:hcbj5 2 llis 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 flows7csdbb( dct/2bv/c ;*yg8iz l in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in /s; d7yvgiczc l8b(d2*b/c tb the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign .i smo 5t5m54 q va+jc7-7z)dzrhidbn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pri5zdtcom 4-75mqraj .bi5h ids +v 7)znmary 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 tx(p iq:e-b8an6 ,* anfpbn:r lurns on its secondary coil. If 120 V at 2.0 A is applied to the primaryn 8,ppbie(laf n* :r-xqnb :6a, 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 coa ,lz1d8k8 fapil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,,p l8aadz81kf 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 transfomgrijij cf. o3lekw( 6*23-ijrmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secorlf mi j3c kwi23j6jge-* oi.(ndary 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 transff/pb g75vl* wou 08pa 1zrg2kyormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volz270 ba r/k8gw5*p yol1pv fugtage 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 turnj8 ion2s r0ff*cop+3 us and its secondary has 200 turns. If the sijr 0u8poc+f3 n2fo* power input to the primary is 100 W, 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.cnd+ sr upvt562 e),nxch3q7 c 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 number of turns in the secondary if the primary has 200 turn6c) p 2rcnehqn+ cdx7u 3tsv,5s.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually saw 1/m4w jkq+utepped 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 trw q ma1+uk/jw4ansmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagemf+0ek:7rgb p is usually stepped up to 4500 V by a transformer and transmitted thro0+:kfgemp 7 rbugh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lo/cy *+2 1g82wuuk nyu2ixqr 0hp*2 ub ol3aqrnng 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 would be lost if the transformer we b n*iupug/ cl0*x2 2uany+q 8horky 1rw23qu2re 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 c o9g eg0 ik5f8md;3ueuf.mn*0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, gfm ok8mui*e9 ;503ungcf.e dthe 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 f, qqdu5dd yjs lnpv1130 .0fdic( xkzb l-k/1at 1000 V. How much less power would be lost i q-kdpjl ,f0df (uvzds1yd n151k lc3/.x0bqif 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 transmitt(0m1j-xy df vn- or-ssed on a line with resistance of 0.60 W. To what vo1y- osxr - fsjv(ndm-0ltage 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 a current of 5.0 A. How much energy is stored in the ou2bd xkjy4l-6pt;wfo-. j3x coil's magnetic 6 f.-oydlpu 34xbk;x o2 wtj-jfield?

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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 containf6a -0ncxyq4 a2aerw1ly9p :3zxb cq,s a 6.0-W resistor and an 18-H inductor. What is this6 ,q9 l0x x-4w cpy:aera 1nybf2q3zac 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 rms voltage iqbz30v) jy 5lfs 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 120w,sm 2c g vcon4*fawl8 s89-nb-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 into a 12owj9kr2uz3kr2 q:,b c 0-V AC outlet. What is the resistance of the lamp?kzk3uob j229 ,wc:rqr

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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 i2kg dy3 gv22rdk fxm3:s the peak current through23k3yfx g:d r mgkd2v2 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 connected to a 120-V ac power supply. What is the powerea,p6zr/lb;zhu cgwhjvi6 9; l( g8dxeje*:9 dissipated inghll6iudz9 9rz; x/av:8, p;b wc6e jeej* hg( 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 xd. uw2 ew5(:hckp8yi-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 resisto9 z71jq,)ont gvik9m(wr x+hc r 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 ay0l5jrz t 0/fv 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH iq3ii+7x6 pa ;q5kyrh lnductor 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 2.50e 3e xc 1fq2cl 1/m-s-onn5vsq-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 a 14.0cj 8wg3q-:un e.y8x um-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 reacta0o kt4is9 ew;knce at 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 inoc)dv ih;7 ac. a 60-mH inductor when 120 V AC at a frequency of 20 kHz is ahi 7a).c; codvpplied 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 dueu03g+zuc41;l r-ytsaxj qbj/vhg 62h to a 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 capacitijyd)l2 (q 9pmcve reactance of a 4.7-mF 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 needed t+m ( dd:ph1 xk7z,3tn4-nt:bq5w *l ogcgrdcdo 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 capataln+(skbl,8s.vj, n5n0u ecefim:l./ai 2ocitor 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 capacitive reactance of a b5kuy ,ppr1a6y*qg,c9 tjg *w0.010-mF capacitor be 100 W?y,a *p*y ktg bc1qgjp5uw9r6,

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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 ts9x /abn cq hry5de9+170 vuqb8/ivichrough 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 k ,,ratpub7vu mo,)m)6sz,ml circuit with 12.0 W resistance, 15.0 W inductive react) muob m6,sr)z7mlavut p,,k ,ance, and 10.0 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 a9ek )norbzf38in )gy 9 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri9 kg)iezo)ynrb8 39nfes?

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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 rj- l3tm:fe;o mesistor, 20-mH coil, and 1.0-mF capacitor ar t:-; e3mlmfjoe 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, whyhbkqcolt ov 4 *8o)2*at is the impedance at 1vb2 olqt4o kho )c8**y000 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 induct/uxeq*x.2ta(32r mugeeas3p or, what is the phase angle at e223*geqxau3era(u .st mpx / 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 1.0-mF capa1xdq)56 )zwb hbus6 krgj2e53 -k ygfocitor for a total u 13b j k)dexb)zyr5h-k gof6gqws562impedance 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 needtnjeq:q **:vj ed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzj*q j*: t:qvne?

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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 inductwkm;):y msmrwu 09xw5or at 5000 Hz for a total impedance of 4000sk;xmy wwwu :)m09 m5r0 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 with a 100-kW resistor at 1.0-MHz for a qrywiu;8q afmr nq3 1g-057ydtotaqgrqwy 0-51m83nryaud if ;q7l impedance 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 sew7q:5 m5h xshu b; h1aek58ca c/x8pclries with a 20-mF capacitor. What is the impedance at 1cxm5wla5 p81qx ac k 75h8;bscu/ :ehh000 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 a3cizq k n7;g8q total impedance of 45 W?nz 3q8kq7i; cg

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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 tdb9yeyyw22..86, qjgz blb lcapacitor at 1.0 kHz for a phase abt, 2.w 9lblg8 djye2 6.yzqybngle 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 w/rf gb i(k8x+in series with a 30-W resistor at 1.0 kHz for a total impedance r(/8x wf gi+bkof 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 j(y h1.pq siv:+hzct5120 Hz. What is the phasethj i5.yqszchp1(+v: angle?

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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 resisvtw8aq/88iw2drtl *ht3z (emtor, 20-mH coil, and 1.0-mF capacitor a2vtw/zr wl(dq88mt8h3e ta i*re 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 resistor, a 10.0-mF+qew 1su; vj8:kqk q6f capacitor, and a 0.350-H inductor. The circuik6wjvek:s8u fq +;q q1t 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 capacitive reactance 30 W, aib67w v.-7 eyvjosz+hu7 /x gpnd an inductor of inductivjb-+ x6h7ouwpvsz/ iy7.vg7 ee reactance 30 W are connected in series to 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 RLC circuit containig t;hcreixbnou :p0rx/7v; 4.ng a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connec0;;urt x7 h p co:nxi.v4eg/rbted 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 seriepwm 7 7tkkm0q ae-j-r6s with a 500-W resistor for a phase angle o06jkt mmw7 a-7q- repkf $40^{\circ}$ 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 -5cv fpif8c0nR = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have mf f0cv5pci8 n-aximum 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 88j n oqk(he4;zpwfu*oj/ +agcircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V4of8e w/;k hj(jqo+*a nzp 8gu 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 circui edbw6f 7ycpd sa;5snfe1 p:p23:0 whft 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 abw*/f e a/.vj qej.4ovnd a resistance of 30 W. What is the power fa.j / vjeo* bqvf4e/wa.ctor?

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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 sepeon h4 u/spgn,c 8,;iries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when cugs;o,8n,i pph/nc4 eonnected 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 fr4 hks pmp:kl8 uwr2h71equency of a 1.0-mF capacitor and a 15-mH coil in series? plm1k 2 kuw7s4rp8:hh

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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. uz 9,g*9khg ult91qkn7-mF capacitor for a resonant frequency oq9uuk1k glt9hn* 9zg ,f 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 )d9bwoax:au7eke/+*i x5g qk .7-mH inductor for a resonant frequen5:)kbw axx/ +aod9g *qke7u iecy 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 in series 4um4( tv 01c+fj 7 ;sisyqp /tvqwimr2with a 30-W resistor and a 40-mH coil if the resonant frequency of the circufi7c4(i4 vu;wp rsj0y/m12tqtq mv+s it is to be 1000 Hz?

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