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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 units of m pzre5lb6o 6y6agnetic 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 inducts ,tlb3v98 l0 po4xktt h(igrz-r,; szion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kingr*m wbkc0/ 4byvewa8h3iy1 (mx1t b)d of change on the w x3w(byk1/eh)m1mv0 * a4 8bcibgytrinduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop ofx 7nv7 ks6jf(x wire produces what kind of changn6xj x7sv f7k(e on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change ow9km*1x2h5xos,y ,l;rm yiu it+;fjqcv ku5, n the inducxmy u2r ,5 ws9t+fu*5 ;k,1x,jyolv;miiq chked $emf$, 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 magne u1b00kopi.h ctic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an (nh +d(45s k,qt *wh iitkcrb7i7x l2zinduced current in a conductor will be that whichi+7d(*thicbs,hl7k( zq4 25 xw r ntik tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above ith8sxo1 qo 369a m,7clbc sih:hs center with its north pole pointing down. The s3oh h1b:8cixs, lqsh9 7 mcoa6tationary 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 magneu9xj7qb x0dr5u55syz:o7 (onsx o r,lt is held above its cen( z:u xx,xo quyn0d lro 5js7sro9b755ter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table29ml.m py hvde7w *4au top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense *wuaymle .4m7v2p d9h of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region whzk e(pdmxa3k6b: + x0aere the magnetic field vector points straight up. The magnetickme3pd0x6+a xza(:b k field suddenly grows stronger. When 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 top in a )spaa6nuk ,j2p5/q gdregion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above,ajnqu6 a2k/dg )s5,pp 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 oyon: v-4gr:nz yud.0 qn a horizontal table and carries an ever-increasing current northwazyn:: -4vuo.ynqrg d0rd. Two 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 through a loop of wire with the norwt- vdez0hs)1 th pole entering first. As the north pole enters the wire, the induced current will be (as 0tevh- )dzs 1wviewed 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 angulazu)mlw,9mw1r j,-nha r speed about an axis whose directiuajm1n,w hrm-), w9zl on 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 rp 2i1/zq iz1; ej3caawotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ori1i2w ezz p13c/iaa jq;entation 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. hihau-qxkl;:+:ptu l, 1f l*rb/p:bn
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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 ae/pwq3n,*umw n $emf$ 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 magnd 3if1 1x) *wcsjcc-nietic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directx*k uez/.h g7pion) is moved northward at constant velocity through a magn.k7h*gx/z pu eetic field that points straight 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 consov; (fcy**6 izwt 0cs4uz*gl 9dx jl/ktant 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 tra8b2 c jbqoq2j*j)xft)nsforms

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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./6sw 5;mds1nqq jrr6 : xyz ,grld1,jn The frequency of the 1w 6yq ;6 sjlxqrmn,15:,rd/ s gjdzrn$emf$ 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 usedvt1 *l+d )qyqe 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 dcj1 q3l ww xm2 ,i9l8 -kng,hq2dozwo:evice 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)misiz3 z0ot y79mh zj3:fll, the secondary coil contains more loops than the primary coil then it js) 9l,z iyot3 m:f3zml70i zhis 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 secoq 2igz)q.j0s +b ly(qcndary coil then i 0c2)+qq(.qygb l szjit 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 powertj.bw n1gt.t4e8l+:n 4t hcao 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 resonanto oc9o8 glfqgvkb 9685 circuit,

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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 tow fpaa)x 6;20x3rjusp an ideal battery of constant terminal voltage. At the moment contact is made with the bpxwa06a2sru)3f ;p jx attery, 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 inductorjl 49ns2d *nz;s wusnag/uf( m 9-sdg/ are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductossu /;gw*9ja-d / m2 z nss9ulfd4ngn(r is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to ,7c/zfq e2v*7yewkldan $emf$. 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 Rsn0e6;z0lby *b*exvqa+x nf+ 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 cv m(/e9o3 gqjxr.rm scp+v7fl1f ; b/bonnected in series to a battery. The time constant for the circuit represents the time required for 1 739grvjpcvr+ofs(lb; f. emm /b/qxthe 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 indu(c /z2sxl s0ad9v5p :gaq9srqctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant fs ls:qg5c9 0 qars9d(ax 2/zvpor 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 thew* k6dutb0 0l0jpv*en 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 gd h8j3ryrvd x2*,y o/AC power supply. On 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.t u5 dj;h0 2iuai,6rgk In this circuit, the current2 5,ug6d;0ut jarihik

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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 facflj8ey6u 58 xwtor when the frequency is trif6 l8 5eywj8uxpled?

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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 hiyub5ypob z9 0( ;1 qka4u*cpinductor is doubled, the inductive reactance of that inductoy*0pp4 5;uqiybz hkab 91ouc(r

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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 approach( rlj /7gsp)gnes zero, the inductive reactance of thats)pl(/ g7n rgj coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuirfc1;4( )fbp blh;yc ,4q ojckt, the curreqp )1 k4crlcjh(, b ;f4;cfbyont

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanch:+k s4,zej jye in an ac circuit changes by what factor when the frequency is tyk,ehj+z s 4j:ripled?

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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 adbbb og6op4 hs/j2ov*30 ak5x capacitor approaches zero, the capacitive reactance of that cap 5kh4ogbvbad*0xo 2 bjsp6 o/3acitor

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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 capan lj h.-,p9ry0ximm:t citor in a RL9-0p h:lxytjr , .nmimC series 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 RL,4g 0.tv ujqzl fnl)g-C 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 increasfh2d (ixujt257vcu c) es if R increases. When is this statement true? h )cxf7ucu2d(t2j5vi

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circ8ddf+l.s:y qeuit 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 increases1y2obl;9lcl a 52t x+e wdddl6 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 t2. q4eaqg0 bs+o: iufq-7 ducohe capacitance both double in an LRC series circuit, the reb 7qufu 2 agd0sq:c.4 +eiooq-sonant 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 applied pj-(eyj3paw: 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 circuw7 yet:bg87dvn i1ez35 nmh6cit occurs 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 qf 5 yp-t p;/bdqk,my2a uniform magnetic field of 0.20 T. Find the magnetic flux throtbyqp5d f m-/ y,2qk;pugh 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 xc3sk w2 tmu1*a uniform magnetic field of 0.20 T. Find the magnetic flux thro213*ksxmutcw ugh 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 m is rotating in a uniform magnetic f o;tw rgco4tvpgf 7a-o u7,v3n2j5w3aield of 0.20 T. Find the magnetic flux through the l;n uwf 4 3v5jwvro 7aogc2gtt -a,po37oop 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 singlo le4 o*d/yk)qr3p dp9e 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 c.xr k6a*vb1pmwg5nbw 25 frj+ oil 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 turns of + +tm(zg.onf xwire on a square frame with sides 18 cm. A uniform magnetic field is applied perp x+tozm.f g+n(endicular 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 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 1 : qhy4hj.+ ljy4jf x5gif,-zb5 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 tp ceiu7p*4) varea $0.20 \; m^{2}$ 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 (;6clcp:v*9cuqoa r qa location where the downward component of the E *p:vul6qc(oq acc9;rarth'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 co1, xd3y k*+wgsny)jil nstant angular velocity of+3iydjgyn 1*,)l k wsx 2.0 rad/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-sectizq; 5/qg wbiaqx c78)gonal 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 100.lfuq8(+bizz 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; 9gshacn0;t q-nc xw/ 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, whic9 ;c -c/tnx ;aw0sghqnh 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 turocyk0.(m7in(miksq t 0 :u+kn ns 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 construq/d2i0,sr +gxiysm + uct a simple AC generator with an output of 12 V maximu is2+ gum0 +ydq/sxi,rm when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximumq q1f q1o;r/wz $emf$ 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 o6 rax e*d5 w0/ offqhjcm 1/4z6oq,wuhf 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 6.00p 9nbcdh,j3uu 9q 9v0if;0lfq+(prcd W. The motor operates on 120 V ACd;9 c9,q+fhf 3uc0(plbij0rd v 9 puqn, and 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 supply. Topdgd21 ygd1 u z:-15sf)e xpohe operat-p:uxzs2e op)y f1d1og 5g1d ding current 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 to a 24-V powec ;pahf7; .n/gzh)(,zhv lih dr supply. The operating current is 1.0 A at full speed. Whavcdz/ha.fhh lig ,z ;) (nh;7pt 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 connec temg6 :s:e*ibted to a 24-V power supply. The operating current is 1.0 A at full spe sbmg::ie* e6ted. 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 needsxkiup6 o/0tg6qldg72/wn k ,ed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow/ su9t+nc8o, uo hhlo0 i4km9w in the secondary. How many turns are h9o4,w+8 iul9 c/hmuks0 nootin the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-Vk .ed.xwn 6iw2a+1nwn secondary hn1wk 6. a.xwenwd2+nias 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-turn primary coil and a 2000-turn secondary c7ectgu7(hfk uc :- a8 u7ip.zooil. If the current in the secondary is 3.0 A, what is the currenat8h:-fcu ozpgkue 7u7i.c 7(t 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 r rs/90iin,b. qt+oikl v;0dj in the primary of a transformer. Assuming 100% efficiency, hlo;q9 v,.ri0tjnski0rd ib/ +ow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a sqlflleiq : -:.7 pk7ineon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primar-qill7 :f: li7.peks qy 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 turnmmy2j8 pv;*i ls on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in;my*im jp vl82 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 t ijh,n8cf.:wf urns on its primary coil and 300 turns on its secondar f jcn.8:,ihfwy coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuwu/ c/dzy68d 5uc:w1ndl plwa)zi7c +rns and its secondary has 200 turns. If the input current at the primary is 100 A,)nudw/lzcz:8 cld5a176 c wd/wi up +y 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 transformer has 100 turns and its seco,q(ut t iq8q/1ybh,s lndary has 200 turns. If the input voltage to the primary is 100 V, wi 8u 1,qhtlqtb s(,y/qe 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.k )ty1of8ulu1d1zm0 r If the power input to the primary is 100 W, we can exptuu11fk1m8dz 0l ro y)ect 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 cur:1i9p +fxbj n0g7m b;5 p 1pw6mdtfcm05jejca rent at 120 V. The voltage is usually stepped up to 4500 V by a transformd;p0 fxn1wfj1:9 t ib6mmeb0+pj 55pj 7agmccer 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 voltage is usually stepfqpw3csb/ w0:m 6aurzu7qo3rg *h*h0ped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find thw060 *s fczghhqa:/uupoqbr*3 w3 r7me 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 1r( oaw7lg/aw/v ,g5l05slugw 20 V. The voltage is usually stepped up to 4500 V by a transf0, l/5/ g5w7agswlv urwl(o gaormer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance o1 . f0k5lc87i / lh2 vb:cj*fcqqxwmzaf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were n 05 xl haq*wj2:cvk8mc cbq7iflzf/1 .ot 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 ,vprve21z;-g,g hc9dgrls ;xa 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 transforme2;c9x,-rhr; vlsv,ge1 pzd ggr 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 atvfmn1 d /*8nr;-tu.g*b lzacf 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?*l-/v*g dn;8aur zfnt1 .cfbm

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a/w x7826uq8p pbmkjw llphy2 : 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 tran lpm2b p6hkq87j8wp/yuw 2lx:smission 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 mv5yuw*- 9y toguch energy is stored in the coil's magnetic fivyw9y5u* tg o-eld?

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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. What is s44*vdbfwl4 enr8dkypn 6,ia f(c;b 5thi(8by, f; dsfd r54npiw4k * bvnl6ac4es 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 v15 6c hlg bn66l3qy:dvlie2z boltage 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 outletsb:45l(sujne9 2pu wp h g.c:kwvj((f. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What * ,w .ra13+kixxvkp .tqdhx(vis the resistance of the lamp?dv1*qxh . 3 .,xpxit+wrav (kk

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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 6;(jfdj y 47v vyi /2 frmu3n6lt4iqqssupply. What is the peak current through the resistor y7 n;vyju2j4d/6vl f(mi3fq6 4tsiqr?

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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 .*).e 8bb;g d; jzkkvxajsq:jp i0k m)is the power dissipated injb;:.k)pixkz e jqkb08 *g; jv.d) asm 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 5+n/-5xyf ckgq0-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 res9few5udu/5gxa. q+j .:6bj lkfq p) tnistor 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 5:4hs 5flv -;ucj y(d.qdbcfi50-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 mj1-tbp jgnrs 8 c-6:iof 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 29(s7k fu p+11phgd hnr.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14pemf7v n(na:, .0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at xy7tvvx6r2 6 ytt(8ob1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH j;o4 ssf9n5 h1oh7vo p .7o fdb70pvyvinductor when 120 V AC at a frequency of 20 kHz is v.;74so9pyo7 dns ho1 j7phv50vfbfoapplied 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 thrk1 f0dw 551sar /*dbovak8uaf ough a 2.50-mH coil due 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 capacitive reactvd j brnd 6pp a;;//yn3tw.lf1ance 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 to have 50 W of capacitiveuid dz 60.y:ia3. jo8xjqqln3 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 capacmb-5ko2)ka 5vmlii 5citor 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 capacitivejo w*lofs :ed)*o1j z5 reactance of a 0.010-mF capacitor be 100 Wwe1 :f ) oso*dlj5j*oz?

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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.ulmw(dfu( af*f6+ se(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 13lsr9sjzs;u d m2bp(yg 8:y8b2.0 W resistance, 15.0 W inductive reacs3bjlrs ;y z(bmg2d s:yp8 89utance, 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 a 100-W resistor, 20-mH coil, and 1.0- b-90 pse4nyiymF capacitor are connected in series0ye4 y9-pin sb?

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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 resistor, 20-mH co( (l fqkanx1z92v)tbj il, and 1.0-mF capacitor are connectednq bfxk(1jzvl ta 2(9) 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 inmof fk74hfnc -t8re*9ductor, what is the in 4co-f8m *tkrf9e7 hfmpedance 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 series with a 20-mH inductor, wha nm)upnk)4+2 iajed x2t is the phase anglkijnm2)+eu2pn a4x)d e at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20r,0zn/1zokfj6v jd ( p-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzrk0 p ozjf/zvd1,nj(6 ?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followin*+w l;1m hra 6r6,zr mf7qbneng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W aahlmbm 6q; rn wz7* nf+,1re6rt 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 k:rw s w)yb35lin series with a 450-mH inductor at 5000 Hz for a total iyrk :5w)slb3wmpedance 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 ow j4fu9r+xg8yr3ozxm(92 vcbe put in series with a 100-kW resistor at 1.0-MHz for a total o3rxu 9(o8mj2czxy vr9+fw4gimpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the nsmcm g0v(6p7 impedavc6npmgs 7( m0nce 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 akywymdgs. w k 2xm9aoo6ua-4m5/mr*fy (6 9hx total impedancew* uk529y xy(hgfmrsyk m mmxdoo-664/.aa 9w 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 5 e+08yz5 avca 222ccs wqonrtsc,)gt 10-mF capacitor at 1.0 kHz for a phase anglea5 5ncy ctz+v s2 )o0ce 2w,rsg2qa8ct of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor - xw)j-xr gr/f*hn s.kat 1.0 kHz for a total impedance og.rhwfxxk-- *n/ s jr)f 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 -::)qwi mod 4ocjuky0a 100-mF capacitor at 120 Hz. What is the phase anglqu:y:o m4i w)-0 cdkoje?

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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 resistoytl2e za/nc1/x* z wzd ue0ml5wl q)-2r, 20-mH coil, and 1.0-mF capacitor l)z/yd-xzte l02 *n5mau/c ww 2lz1 eqare 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 apke uz +;+x 2.iheyht: 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suptxkeyu;.e+2hi h+ :zpply. 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 m dfj2sa1) zrzxn00o5q ;l1zwreactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sox5rsz jm1l z0;0d1f2z)n woqa urce. 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 circf1zar4 oxtn ;pf:6w a*uit containing a 50-W resistor, a 10-mF ca1az6 oa*n ; xtrfwfp4:pacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-Wsav 5+v en ctwbg5;*cwagl.hc g,e;,, resistor for a phase angle ofewevcgw 5agn ; 5*s ;,ab+c ghtcv.,l, $40^{\circ}$ 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 xetid4zoq 8.g cb3r:-has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from 3ctb diqrz:8 oge.4 -xthe 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 seriesk85kk+ m. q.mcdyybj* circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive kdkym+k y5b . jm8*q.creactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit /a- rwx7. hrlrm:wg(n(wxv( 9rjpo8o 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. Whi,lbg h rs0a7o.m)cni8 v8/x nat is the powerb .,isrvn8o78a hi)x/gcln m 0 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 seruuo1,:)-nazmkh .h ka;d 5mdy ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu, k 1doumdh)ahzunky5a .-:m; ctor, 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 a 15-mH cosvq v18qecu s 2lp+ec1e 77v6c1l*vghil in series?7vqs glu 1e+e qcpc78 vl1v1evs*6ch 2

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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 frt /nnf h1.;fyjequency .jh f n;tfy/1nof 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 inductor for e3 1j::xgdj g 2xh;edla resonant frequency of 1jd;1 d ge2 jh3g:ex:lx000 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 semol8m lc f l7a,1.s1rcplb -x+ries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be1r. 1mxc8, pl+l - oscblmf7la 1000 Hz?

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