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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 magne ualu5i8*xq,(tq 0wz btic 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 that thev5.cm8fj yv u qt(kp.3l;pg0o $emf$ 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 cola3 qn32l( 1zz u6vekk6uvj 1sil produces what kind of change on tn1(qe2 s66zk k1uvla3uljv3 z he induced $emf$, 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 klls pl/6 aow,- :0xyqlqm-p 2the magnetic field through a loop of wire produces what kind of change 0l/q,kla-o: -pl y p lsm2w6qxon 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 khz160kw7g sxrm dq.l7ind of change on the induced qr17. wsl m xz0dk67gh$emf$, 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 mae7;oo;*b stod42dpvrn-enp+gnetic 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 induced current in a conductor wip*d4on *ewu7 /dr*0bg*wy z iv-bje) jll be that which tends to produce which of the following effecn*jbpb*/ uwdir *)0govwe-dy e74j*zts?

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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 s8vi7cccb-b 86vo) m vbar magnet is held above its center with its north pole pointinvb6v8c vb8-s i7cm)oc g 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 tabl/c,gkt6ox1n*tzrky4 kih (.w e. A bar magnet is held above its center with itsg ctt kw6zko1/r.4n(kiyh * ,x north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the1vsd h8r sgy41 magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thgy vdr s118s4his 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 le061fzrxkli5 cvel table 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 incr1lcrz x065k fieases?

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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 horizonbe+ceda/i 0 :6f iui6o aou7d9tal table top in a region where the magnetic field points straight 0c oa 9 dfi6dieui 76ab/o:+uedown. The magnetic field disappears suddenly. 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 an ever-increasingy8xb)/ k)yn)iu dk+pd+eh da0 current northward. Two coils of wire lie flat on the table, one on eitheuby) d dnea/pk+8 yh+di)x)0k r 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 scvaq36ky :t vj3sh 10+ lpus )3yac7xnorth pole entering first. As the north pole enters the wire, the induced current willq 3p ujcska3s:7)3xca 0+6ylhsvt 1vy 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 angular speed about an axz838a.zu vm eois whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of te oauv 883zm.zhe 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 angul;7c2xzv 3vm x(l jk3j4.gcmyyar speed about an axis whose direction can be varied. In a region where a uniform magneticz3xvc;2mc(7mxj y 3g4jl. kvy 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.h52ql*q( ql pe
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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 ap y +vu;m6q(),cdk es$emf$ 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. Thmp9v /n). oi pdjpae*ugw.+ i6e $emf$ 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 northward aji*zr/q )6k pjc-qsqp;9q q6at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the roqi 9ck /qzar6q6-p* qpqj; js)d.

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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 anglk3mwb0t 7r)vjckky 3(e:- lvular 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 trok 9j5rq(zmcbq: 2j 0hansforms

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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 te/z z*10 4ohyc2esjtxhrough 60 revolutions each second. The frequency of the e yoet14xc0hz zj*/s2$emf$ 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 useub sx5q1a(q )qs,h/ywd 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 device 7nyx 8f;v/f*tfa4kqcq; agu3 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 the primary 2(d xmhd hm(,(7kuxd qcoil then it is a(mdh dxxkm7 u d(h(2q,

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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 secondagu,d65ihmim 3ry coil then mmhii6dg ,53 uit is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power input04zf;. e)jvhmdg,4 k0 gpgp ov

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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 circ+qnp 1cu0k9;rqjk*vg;s 7lq wuit,

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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 idi qe+i+3aa:fv fu sb6t-p92aaos4.n veal battery of constant terminal voltage. At the moment :a4asaaifeb+3 uvs v2 t 6oq9-+ fn.ipcontact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cxld;r f+),4(j w wofun2vc 5mwonnected in series to an ideal battery of constant terminal v )fwjw (o,; w4ncxd5fm2lu+r voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista6dkis*rn+kkn 1 mwy c*7 4l8yvnce 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 inducw +oz)d yk6r hzxi8o9*tance 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 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 p -jgfqly o:c1gb;2i1to a battery. The time constant for the cirgy1lcgjb: 2p 1;qo-if cuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battez+, -tzt9e+kdg q0bfcry. The battery is suddenly removed frk-qd +tgz09 ez +t,fbcom the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excep7-,rmjgws k* gt:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cu3jj kuj7:ndn ,s gtxflmy/62ek7 -3alj;unp (rrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, tj:rlq) z(wa-m /fs8y8fw bvh 4he current/w 88v4:mar z-yslffhw qj() b

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequene+g2waxp bhzi7qp.5s4 +3p d zcy5 sp+p a2 pxgiq.w+ z7d3ebh4z 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 v9s8d7ki)1/ )rzm y mon: zlsauoltage across an inductor is doubled, the inductive reactance om7o sz zmna8))1 ru9:/syd iklf 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 approaches zero, thwnvp9e:hos *9j;k q v/e inductive reactance of that :o jnpqv/9*9h;wk sevcoil

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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 a(feut+; w9a gg4q:aim(xqd2r ;o dx1wn AC power supply. In this circuit, the currenw9:q4;1 aud(q ed r ixgt+;x mof(g2wat

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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 f7z rw,pvbc; ;changes by what factor when the frequencv7 zr ;,bpwf;cy is tripled?

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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 6z/0wb lhw6x gacross a capacitor approaches zero, the capacitive reacgz xhw/6 0b6wltance 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 the voltages of the indu2nk ddf8e 6uep5svjj,0:df fo8l,e:nctor and capacitor in a RLCd pfj6u80s2:kv8f eno fdn j:,e 5,lde 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 RLC circuit i f.dy5n e n.*g85z1x rgd4ag +qq/znoys 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. Thenh g(fn0,x bg-giv+u 6 impedance of the circuit increases if R increases. When is thi-+vx, gn 6bginfuh 0g(s statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasgz;3 0-rjvc eges 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 circuitvr9b3 3nbds,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 d. 7ayi0+qcmrmeb)tm31i vs n/ouble in an LRC series circuit, the reeimcmt)qr.y 3m 1an /i+b07sv 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 gz 49pba5cpel7/p p7 hvoltage. 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: iey i :;v4cabj/ek*h circuit 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 rotati ck4pxpag66rh+wm. j9ng in a uniform magnetic field of 0.20 T. Find the magnetic flux tpc+4p gamkx .w9 6r6jhhrough 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 radixsxhx pb xhb2s9 -5ae3.wpi-9us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicul 35ehb sxp9s.bhwi x2- 9xx-apar.

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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 w7b4 o8 aqlnl2uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of qa2lo7n4l b8w$30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional q9kgm1 s6-bmjx:/cgx , obyc )area 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 changesby65m dr 3yvt9h4iz;k 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 t),ptzmx.8gs0gzp8 o9r o /m ip sog*7surns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plaz sxs9mpi0tzrp/s ., pg)g8og*o8o m7ne 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 15 turns and an area 16ybq1 9w *h; yjzbpeiof $0.40 \; m^{2}$ 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 andf/wz1 lx)5(wbi *xyg up;3rcy area $0.20 \; m^{2}$ 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 location where wi9my+tca* ud7fvg;+x 9)o msthe downward d+;yfxat*m7 gcm)swvo+9i9u component 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 angulk5u+faep hcpjl0o * ,;ar velocity of 2.0 rad/s about a vertical axis through one of its e p*okcp0uehl+5;f , ajnds 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 loop n l.-vle w0qhb8,tj/hs 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 consist 6z 0nwk2br9luqn casp7,54s kn 1lj0es 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 6ea3fb69qs-q::hg)v bpc ze yloop 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 36pqa)be-b:e s: gcqf yzhv96to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ac6 nyixu gzwd1r-d9(2rea $0.090 \; m^{2}$ 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 Vn/bb:gtexh; 7;d3(km+ s ktq w maximum when rotated at 60 Hz. A magnetic field of 0.0503bs;tkqn+ hx dtb/w e; :mk7g( 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 winr f ;jjd (, ebzm*wv3r.ei/r8th 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 have a resistance okl7g y6*7m vgimv 6 yeukf/93nf 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatej rdyy bq7dff; l8* z9d1yxzb(4e gl8-s on 120 V AC, and wh4y7 1b*-j8(gf 9rzbldeyl;zxdyd fq 8en 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 pownt-q5ox6oc4d. s570 8s l.tht qd j,3prwlkcger supply. The operating current ilj k4 tcg.7q85w6s t,30h .xod sdq-pc5 otlnrs 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 qsuva-c()m 1sresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed-() m1sqaus cv. 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 resistancel .1pqhc7 ia1j( xhbo- 6.0 W is connected to a 24-V power supply. The operating curplhb(1.a7iqhx 1 oj c-rent is 1.0 A at 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 nee )6v(a.)9hvsby0pgegas r, la ded 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 ue 51k; a*nmsvto flow in the second *muv1s5aenk; ary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are ner59)/w 4es lxlww u.3/ nffatncessary in a 110-V primary if the 24-V secondary hans9f4wa txn.l)5erl/wfwu 3/s 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 akz e r /l:tghl2dtj9*( 2000-turn secondary coil. If the cultk*tej /d 9lh:g (zr2rrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Ag gm5x 27wnj:s44 fxagssuming 100% efficiency, how many amps at 24 V can flow xgn4ggm: sxja f5w742 in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon 20xowd0;f d puhip)xg) b2 ph)sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dhb2ipxdpho0 2p) u0f)wx;) d graw?

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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 turns w) 5jsu4sgo4y:97jzj/xh 9ck/abjfg on its secondary coil. s)xsw/j h9 a5ugf zyg/oj4cjj 9:4b7kIf 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns onp pt9rtbx(x-9: mt6 vq its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presvpb t9:r6x9pxtqmt( - ent 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 100kp8p fn.u(l2 p turns and its secondary has 200 turns. If the inputku8lf . 2nppp( current at the primary is 100 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 transformer./ s4v/ wvkzuu has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 Vsvwuk. 4zu //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 10v2sc dy+pxr+kb +rd jxo ku-4+oe j(*70 turns and its secondary has 200 turns. If the power input*doo d kxvpr+k4e+b +jy(x7sc2+ju r- 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 /.wx, -my7;bwl/ c wywpsu4gi120 V. 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 sl/w;g,w xcb yuywwps/m7i.4-econdary 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 pha m/fj3l4 4mV. The voltage is usually stepped up to 4500 V by a transform34ma /hflmpj4er and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stj7xpm 2i:+ / xs::7 cntakmwxyepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage a k/cpxjysm+x :xn7w::im t27power 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 a7g , t5rl0ob)q 1a*amu xhghx2 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 thelg rubx1q5 7m o)t2ahgah, x0* transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km px(+s*tfm -td 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 wdtxp-t( fsm+*ith 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 wma ,6q9ylhvkqnl(vf30 e;*g a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 09,lfah 6ln* m3qe qyk; vwvg(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 ytqd; -ev ygv*/tor4ola)0,q 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be l o*ryg e;q-yqovt t/0a 4v),dstepped 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 co0qv:zyn96mu w:a7 wru il's magnetic field?ruuwmqv: 97wy na6z 0:

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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 1vlt,n* 70zkx q8-H inductor. What is this circuit's time constanttv7* ,ln x0zqk?

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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 c ola,(7fkb9slsrg1 0q 2r(jngircuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-g9xl5be6vt2wk d 6c4 sm1shl: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 120-V AC outlet. What is t sco38+g47,axwmdh im he resistance of the lampg4+7xm8 i3ods a,w cmh?

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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 ac4+ s-/ d:lrnf )tnu4nax:t ofv power supply. What is the peak current througos -t fda)nl4v +f/xu4 :tn:rnh 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 conxw)c op6+6b(oe*)tdxig.rm9pzy n y-nected to a 120-V ac power supply. What is the power dissipated in yyoroe 9t x*d+i.zn(66g ) w)xmbc pp-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 bidmp i; 3vhrd,/ fh5by7/(nqa 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is9jw. lvnxa.i, $I = 0.80 \sin (240 t)$. 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 isajefj*0:wrcfoaom.( wg n- 62 $I = 0.80 \sin (240 t)$. 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 7e it21dzq2xl1.0-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 an wvhi04hvp -5t 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-t j1wh.6 dmqxxr p73r 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductivs 9a.hk;,c(h2qtmp isqit, 2o e reactance 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 in a 60-mH inductor when 120 V AC at a frequency o/m8tdv3vn: gjnxh;l7 f 20 kHz is applied vt78 gnmvnl;3:jdxh/ 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 coilh-1 rh8bpa5 s+t)gbla1:pq: mra ng o/ 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 reactance of a 4.7-mF capacitor at 10 0ak)bx gnv0w*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 hrw,ivdo ;b:, uave 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 capacit,7i4drs vlv z w,i(qg 2q*vgx,or 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 capadtyv mx) f0p4oo0- rti76f6uecitive reactance of a 0.010-mF capacitor be 100 W?64opt76 mediy-ux f0tro v )0f

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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 93)h bpvv y c62gggazry.o t*0through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanzrm8jfl fw6 1e;fmi.i j ys))+ce, 15.0 W inductive reactance, anj z m.yfif)we1mr;s) j6f+li 8d 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,thk00qo; t2xl and 1.0-mF cap00qt;l k2txh oacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistorcq+3o639 i;3yulsu vheo5r3 ,fzs ew q, 20-mH coil, and 1.0-mF capacitor are connected ihu,3 3r;q+ 36oqsflve3oe csi5y 9uzwn 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 i3u lrz;inmi.sx (u(v 6c*eu 3cnductor, what is the impedance at 1000 Heu ( nvi3*3lcx cir6uu(m;. zsz?

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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, what x-,s8.dzo 6wnyln 8leoij . m7is the phase nxow8lz .d je-8oyn7lm,i .6sangle 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 .al7a8i2-wcymggg:x with a 20-mH coil and 1.0-mF capacitor for a total impedance of xa-cg7y8m.a g2iw:gl 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in - .w*mgx7bnonobqfsy/) )xq 6series with a 100-W resistor and 15-mH coi ox/ ))gxs6 qnb7n.myq*ow b-fl to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 500-a5q6n j6x6 s4b hwvle0 Hz for a tob4q6e w6n vah5 6-jslxtal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for ewvp) v/d4bnb(x oq;;2/n20z km.na k9 fxil va total impedance of 150;n/9a.v4pnx e;id wkmbbvk( 2voxlf / q2 0z)n 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 ser y+mo4kt :jg;pw 5jca: ml7q8lies with a 20-mF capacitor. What is the impedan+ ygkc::omj8qwj ;lm5apt74lce 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-mF6 0c5gldbs f0xxa uo/j ncyz(w-s74 l. capacitor at 1.0 kHz for a total dlfsx( 0 z 6buay n7ljxg 4c/0.wo-s5cimpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cap +k5knrk u1oq:acitor at 1.0 kHz for a phase ang:oku+rnkk1 q5le 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 resist - vmy;o*i3onuor at 1.0 kHz for a total y-m;3 in* voouimpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wha; nq u+x-6e dmcsmmilt +8gtik*h,6k. t is the phase m-t8kgi umi, n .xhqe66cklm;dts+*+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 i4(.(y o ndy962ic*n(b p2 ,cyfpkxdc ncl+bfzf a 100-W resistor, 20-mH coil, and 1.0-mF cac*(b. cz9, l(2 fx+nn6ybnc4c oypdfdy k(pi2 pacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mFvyhg* -vqd:, ne49r vs capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currente 9*4gn,q rvs-:hvvdy 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 doy uhv aqvog 3a,*miat;t:.w b0)o 79qmyw/7, and an inductor of inductive reactance 30 W are connected in series to a 11tb qi;dg. h:o0/u9a yqm t,w om*wa3)va7voy 70-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 seriesm/vm3o fq o:p1s p8cy- RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenpo s1-:fov8mmp3c yq/ 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 seriqf kj9l,ysnht- -u )8ses with a 500-W resistor for a phase angle of s9f8hs nujl)-k,t- yq$40^{\circ}$ 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 haxmzi xs( -d3j1:u5jhcs 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 the driving sourcdxjjx(c3ish- u 1z5m :e?

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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 is. 52a).l-odr jdqun zn an ac series circuit with 12.0 W resistance, 15.0 W inductiveadzn-.r.l 2)j 5 uqdso reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit sx.g+-v o . gzh/oz+niis $63^{\circ}$. 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 impedancitg pcai18t -0e of 60 W and a resistance of 30 W. What is the power fact i t8-1cgap0itor?

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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 s/ke t sx6u )co7e.t 78nm2l 8r0bzrpgderies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H7md )gerrtkc e02sp6z.8o7l u xbn/t8 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 a 15-mH ,mrr s -nq6zy+coil in series?6-nq+rsmzyr,

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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 re4tz5clsb n/;zk/wq /v sonant frequency of n z4/twc5qz;s/b lv/k 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 incvnc rzn:v:0bt 9.ayt15jq 8j series with a 3.7-mH inductor for a resonant frequency of 09ccn:5r aq:ztb 8yv1 vtj.jn1000 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 with a 3q/tu 1g2 o076mjh gyna0-W resistor and a 40-mH coil if the re0m/h on ytj7gq621agu sonant frequency of the circuit is to be 1000 Hz?

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