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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 gaks vv)rcf0,jl 8l:;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 ind ns0ua28ar w;guction 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 69s hnb(r7sgs, ibw0sff5 gr,a coil produces what kind of change on the indu,f6 9b 7s(srshw g5fr sbni0,gced $emf$, 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 of wire produces sw1**q5 m71vdxgr ipuwhat kind of 1r*ms7*iu5qwvg xdp1 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 loop of wire produces what kind of change on the induf1z5p.q w pb2eced 5ew1bfpq 2p .z$emf$, 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 fr 5qbcfuu t(t7bwdd+)ez2pv b in7q7/-om a magnetic 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 z( /tpjsfcz; iht8.y :a conductor will be that which tends to produce which of the following ef hpti. (c;z:8fjst/zyfects?

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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. aff g p)kb:y31oxid.: A bar magnet is held above its center with its north pole pointing d ):y pdfx3b.1agk f:ioown. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held25tu *rd412 (aepw4 wvmwcbe8:uwud hb(l2yl above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducew8m*eau52 lu12ule p(b b4r: hw 4v (2ywcdwdts (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the 7g c58vy.h aqxgh-f*p7 ff8avmagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed frovvg5. fx*y8 8hhc7qgpa- a7ffm above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top ic)0sng goi4 )g 2av7)m( uycghn a region where the magnetic field vector points straight up. The magnetic fie7(y ni gvhg) u)4g0)casmo2cgld 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 region where the magjyj 4ztf.y(v )netic field points straight down. The magneticf4jj tvz(y).y 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-inc,amb vqw u06 w/9im/vbreasing current northward. Two coils of wire lie flat on the table, on0 w/b,vmvq 69bi/am uwe 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 north pole entering firs/ 4pirrsa8.u-q9t y g;iitd0 ft. As the nortr.gd-fa4i/ i8 0y;q ti9psrtuh pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at con*yaax fm 131djxk4h 3istant angular speed about an axis whose direction can be varied. xhdkf 31j314yiamax*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 ihqz dbl bd )y vhrc-87r*,-i*ps rotated 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 orientat*lr 78-hc yzqd)i-b ,pdb*v hrion 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.k0z :),zheo,sp: xxob
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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 thatl w30( gdom9(qcu o2ft 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 f1 p+;lmb/7(rgtor-pcxml (fr ield. 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 direction) is moved northward at coej1cf.mplt+ i/)d0 esnstant velocity through a magnetic field that points stra1e0d i)s+l f.ptecmj /ight 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 angulcxnb bojkc *-u0 w55rtte/6o1ar 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 tvocyx12 .b;i +qm0*1tghpffo ransforms

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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 thrn;le:jqvt *mg 7lme0 )ough 60 revolutions each second. The frequency of the tj;ll:0mgmen *)v qe7$emf$ 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 devicb .wy:s7skh.zgm 4i1u0xgou*ci v (6me used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicrbha(z8: x8co kl:yb d+62o fle 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 lor)xvl+, b b-lgb*oa1rops than the primary coil then it l1av o rxb ,)bbr-+gl*is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary 7 j;:wwtyu b,xcoil contains more loops than the secondary coil then it is t,bu7wxy;: w ja

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th(;af;zed5h wy e 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 resonab.f;ocn w- o vn4(4khknt 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 abm:k8,2oriv 40 qcsu xre connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resisto2o 4 k8:0rm,x cusivqbr 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 j8u qehui7 ni;v eukr+ l44e6+ideal battery of constant terminal voltage. At the moment contact is made with the batte+n4veelkje 8u4i rhi+6 uq7 u;ry, 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 wit:g; rr:,ngal 50rkol: o*icl ph inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with in v7fa3 dwqvnc829ep er8ps id eb)l;,0ductance 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 to a batter48cpqmp3 4n:ubyg xl0y. The time constant for the circuit represents the time required for the cu0q44lm c3u yb:pg8npxrrent 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 is6 6czm8i0w f)z3i t b1)rbqlrap14 9rbpwdz :x suddenly removed from the circuit. The time constant for of the circpbq1d w imzz8i )6bc:)rrw39a z04r tplfb1x 6uit 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 5kqv ,jnf038edc+*r ihuza )i the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the current.i,wv0p ar3so s ek2d,

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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 ogd7xk k2go9+1wj9as3 dyq8xpn 3 w4ran AC power supply. In this circuit, the currend9y8kk334 o qwjxs rnaggxwp o271d9+t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fwr1evh un(2sdzs88 ,w-j /a4ps.hvl jrequency is tripled? alw/pehh- djvs8swuv21s.8n, (z rj 4

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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 acrosy2 okq1yvldy g,5 oggyg6;y:/ l:mb4 ns an inductor is doubled, the inductive reactance of that ind/gyvkn::gmo,5 y1 loq2y gyd y4 l;gb6uctor

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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 zer7.z7uffn70l.nq wonoo, the inductive zlofquw7no.n. f7 0n7reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the curre 0.aq8nlkk3g ru/tx,lntlnxa.q g,u8ktkl3 /r0

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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 changesf9pg/qz , *f27t xzywz by what factor when the frequency pqxz79t z,zwf/yg2*f 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 across a capacitor appro9/;udk4fa )p8+xxf h8gni rhlaches zero, the capacitive reac 4xhh89ank; gl+i/fdrf xp8u)tance 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 inductor and ca fj4-2(+yytt a rxz;f)rfo15gsxc e q5pacitor in a RLCxe ftf5- 5c1raztfo(y; 4s+xjq2) gyr 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 iqj 4qggd har2bqv1/ .0u)yh c*s 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 izb *(uli uc+)y p5:kgancreases if R increases. )a+bcl:z 5gpuki y*(u When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incl keeft0n5t +ytp.v*3kp,h.g0 k6ez wreases 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 seriyx (pbbjlrv4,jp 4qq/-)m.+ka o :dj ses circuit. 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 doublec ; va8sphx/q 75mf1mb in an LRC series circuit, the r chq5f1ba/v7pmm8x;s esonant 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 ab,/u3gkls/cf+y i x .wwx q.(jn 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 circq4ye9b 3 4hdzkuit 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 radi2eq 4;pdesvwfj z+ s2:e0by0vk9 l/wyus 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 magny:e q2jze;ww vyspdl/2s kv04+ 09e bfetic 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 ybgx.id7 6 e,da uniform magnetic field of 0.20 T. Find the magneti7x ., yedibd6gc flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m i)s 5zuqxoe t)2an zud3;5)u ess rotating in a uniform magnetic field of 0.20 T. Findau nq3; )ste zoud52zu)e5) xs the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced 3hro2e0.bagx 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 changes fromiea-8v ui wg4+6by9kz $4.0 \times 10^{-5} \; Wb$ 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 frw/+lffi38wms ame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of theswwm8f3i /+ fl 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 turpe,6ro y4nn.9de m(tans 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 z2;vyk h-9du9;f pndkoo n *r9and 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 locatioq+zd.sz .nbd+ n where the downward component of the Earth's magnetic field.sb+.dd nz+z q 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 3 .cymvu5-urb 2.0 m long rotates at a constant angular velocity 5 cmuu yr-b.v3of 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 hyidhcrag99bn usbt 4-m/vn+(gk .w *4as 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turn, sfb wljvt+9)s 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.zsbq4ir;;ouy ),)2ki 3bx jay Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, kq4ayxo2u bis);rb;z3,j y) iwhat 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 turmba *5mglz+7r cav78ons of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 1*p *dwdc-fdtns /. vn.5(9 j gz8heahm2 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is a8n*. e/w(.v zfdtmda p9hhg *nsc -d5jvailable. 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 m94ye.0p ut qebaximum $emf$ 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 ond z, /sf2un86t+;bj s0gixqxs $120 \; V$ 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 operates on4y n2/x j l)oo+p9mjo1f,ua8a bs2)5z vguocw 120 V AC, and when rf4o ,ub x)5g)+oj uo/2v1s9aa82lzcp jwon ymunning 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 powe+zf*p1d9,8st ncltf6 t yx p/er supply. The operating current is 1.0 A. What i tt6t zp,e p+c 1f/ydnf9sl*x8s 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 internw1c c7f1b:9f,s zp kdual resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at ful pd:1w ffc9ucz b,s17kl speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conrlsb et 81sgml/ ye a1vb:3 (bw9qa0)fa*7modnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back o*d a3grm b 7s 1)qlfb9 81e:sayle/av(0bwmt $emf$ 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 ton ;+maj3u/rx 9rx pl/h 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 flo1 jnv8c, 7kquy:gam ky5w0yd6w in the second,vq1jwkuc:k nmyyg58 y d6 a70ary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary inqzl8 3 -lr vr5u96wfxv a 110-V primary if the 24-V secondur vzlwqx-f 8695r vl3ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary co(9,roxwninyls kne442f1qw* (vf / m hla;a- zil and a 2000-turn secondary coil. If the current i fsnwel1 ,mlq(a4 x4kwz r2h-n;afoi*n 9(v /yn 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 primartft4*-nkoy5 zy of a transformer. Assuming 100% efficiency, hozy-*t 5n kft4ow 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 neon sign transformer provides 7500h1de7ytws cs bh+4vz 6ey5ej8g 2l:m) V at 10.0 mA. The pr8 e vzl 2y1hc+7ybgth 64wsee: jdsm5)imary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primaz gm 6-r,cq :fomj8ky2ry coil and 300 turns on its secondaryrgo :jmq-2,6zfk m 8cy coil. If 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 .96ed3n- yd. +wo6gom nhqkb.o9xsj its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied ty wh-k 6on 3djoq.b sn9..mpdg6 xeo9+o 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 turns and its secondary has 200 turns. Ifk*;apk,p:e io6bf c;p the input current at t 6kkap ,fip:;o*pe; bche 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 has 100 turns and its secondary has 200 ,zrn9 nq2t/ md )v; laguod0vi.9u*so turns. If the input voltage to the primary is 100 V, we can expect the out9urt,*0vd gno) vs q;a /l.z nu2iom9dput 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 hasd gg- +z3sg:du 99-tlw x:1 hcboaoz)v 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary t3os g9dvgc) o:x+tzug1 hadb -:9-wlzo 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. Th 8 3hwfx.mdnh5lm -ah 2xstf.t-gq5-:gq:cmge 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 seccd35 s.5l-tnqx mwft :h2g hqg--a.g hmfx8m:ondary 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 steppe (iwy e0j,hy3( y elg,v7rx4cld 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 transmissiy(, cy yev4 ejlxgwli07rh3,(on 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 steppedayk 9fq/l8 fx) 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 tranya)f/f9klq 8 xsmission 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 lonq 2af)4xhllwp 6f(q:xg 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 trans(lxx2aq4phlqff w6 ): former with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km -81yhjdo4zim* 5yw-utbh* fk z+ * smhlong 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 wim- -8* 45ho*zzsdwi1y m +juyt*fk bhhth 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 at 1000 V. How much less power u plsqw qpj93+ qp y(-a,/b*,zu5obtm would be lost if p3os 9t u,b/bua qjzmq+,-* lpwqp(y5the 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 genef-9dc7) vvi2ehi ry 7i.ij5ghrator is 440 V at 20 A. It is to be transmitted on a line with resistance odj7ir7 .vh-v5c)2ii 9fge yhif 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to 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 culg8v 00b r6l uvxx50qmrrent of 5.0 A. How much energy is stored in the coil's magnetic fielm0r5u x0l gvlx 6qv80bd?

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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 isn+szc4joc (wd36lup 9 this circuit's time co(p9j+ nwd 36scl4oczunstant?

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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 volz9g0s59f sq lfd(zva 3tage 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 place9jxsy ;)vt(dm d into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed iq4fv). jrlwbsf6 8 co);h u9bbnto a 120-V AC outlet. What is the resistance of the lamp?o8sb uvcrb4)f)lbw .qh6; jf9

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peakam.j1s61nv .nwbfy -+vthvn 7 current through f17.nv nvbmy6a .-s j wnt+vh1the 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 h bx)jg9:flt; is the power dissipated in the: 9jgl;hxbf) t 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 5y-, i2sohs9nd0-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 is s( p+q 6rdou( s/*ucvtm2ic8o0ps8es $I = 0.80 \sin (240 t)$. 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 isw h /l;d udodc3p1 3(viw*jwc1 $I = 0.80 \sin (240 t)$. 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 inducjdcl 8/v fcsxeb(l/g 09 7zy*utor 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 r 7 y0crwf86tlgeactance of a 2.50-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 14.0 W of q kcs;vlu- ca51t6v7 uinductive 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 ofph+te+vt x(p4 inductive 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)t1gl 9vp:5a.ccspul nt93f x f 20 kHz is applied p):t19sp5n 9vcgual c l x.tf3to 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 todt7n qg ove w-+1 sy,:i,9cawhrough 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 reactance of a 4.7-md5r 6;)hxa 1,3eqaiddwi *ujmF 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 gorgo;(hyfncca1 nk+ z0 o11 2f zjk88capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance oc: pp bk55s0cxf 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 reai wy+dvlqlr l(72./rt ctance of a 0.010-mF capacitor be 100 W?rdlqy7 t2( ll+ /r.viw

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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 thron3* f,q7om e q*bdft d/ccpw --t+p9dqugh 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 (eiq 19t9whbp zjr)9 q8nw):bvfsl h/of an ac series circuit with 12.0 W resistance, 15.0 W induct( :wp) )qqh1hvjfziw9e /8 sbb9ntr9live reactance, 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 coi.0n1kywp e +acl, and 1.0-mF capacitor are connae+0.n1p ywckected 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 .by3u j2l)jkfat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser jyb uf)jl2k3.ies?

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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 ser+, n*l: ubcd;gra; vp6a oa/axies with a 20-mH inductor, what is the impedance at 100/cb l a6gdaau*x+;nr,:;o v ap0 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 withgb 6jl9 zk6 g+ae98ftvdrtyf2 z.f*)b a 20-mH inductor, what is the phase angle aeb6 .y89f )6 *f aldzgbg9+jtftv2rzkt 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 wit wf4y:,a0 ;)qttm cifvh a 20-mH coil and 1.0-mF capacitor for a 4 y;)i:mctf tq,fa0vwtotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seri4kwv:sm3dkm/d7em6j d- gj:j es with a 100-W resistor and 15-mH coil to get a total imm : kv: 7dgj36djjkwdem-m/4 spedance 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 wxl,qg+4tb r .a 450-mH inductor at 5000 Hz for a totl 4x+,wgrqtb .al 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 pu1j2pv zq kj2 bj,,yu8bt in series with a 100-kW resistor at 1.0-MHz for a total v pjb,j12,ky q2bz 8juimpedance 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 w2fxf6cirv9; 7c3e yfe qxa tnus h86(md1h7l6 ith a 20-mF capacitor. What is the impedance at 10t92 dal crxc mfu16 n67ix eqyh6fs8;3ev7(hf00 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 ca xh7lnc 8;86pyz0z8 tydojzk0pacitor at 1.0 kHz for a total t7onzz j8c8 y8yk;dzx6 0hl0pimpedance 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,q.*sk.wv0,owvq;7ieo a66hs soz rv capacitor at 1.0 kHz for a phase angle,o vha, v* .6.w;ov0sswie7 szoqrk6q 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 3m8tenk(pdpgl;(pl 9arbv2-needed in series with a 30-W resistor at 1.0 kHz for a total d8 l9pm p2vnaerg3tbk-(l;( pimpedance 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 12jb:: s wefc- or5v9r1/wa6tt z0 Hz. What is the phaseb: 5jfwr9t/vc-ot6 r: e 1wasz 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 ifih8d0o5prp*f84 a)ij, zdvyb w pd9:y a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arz5 jpdf)d v*po0 yy48w ,i9h rpi8d:abe 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 consi (ua n98egjf/m,7/tta7lvzgq1d /afgsts of a 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 supply. What is the rms cum aan/t 7vggaz /tdl7j1 u(8effgq,9 /rrent 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 reacta 6e:octh0djogn5 f8c4 nce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in t58t6fe docno0g ch j:4his 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 containing a 50-W xyk*er y;x (0uresistor, a 10xye * u(y0kxr;-mF capacitor, 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 necessarygy fnukogmiij3bf5/d:,4 4 v8 in series with a 500-W resistor for a phase angle of yo8ik ,fgd4uf g/4m:35ijvnb $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, lmez inhd+7sv*ej, x3 8f ; d/w3;vbjoC = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving soe ;3nz37vhbw;x s+,/dmidvf8ejoj l *urce?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.y:; nd9sc7)c uq4 uhbm0 W inductive reactance, and 10.s mcq uc47)n:y9uh;bd0 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 aw0lv/(+ m yxhqki-bs*n AC circuit 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 Wt oo75;6hxlgsfz 9c8s and a resistance of 30 W. What is the pogxo;cos87l tfs9h56 zwer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contain 4 0ejuck ievr3 0q- (wzt4(/j,cpnmaying a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p (m/u q-n0rp 4 i0tkzcejja4, (wce3vyower 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-q+i-f0-kky)rf7 l3re q(tbuhmH coil in series?t-h(bqr3 uk)qlr7-0i y ffek+

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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-m (ll t;8pw8gctF capacitor for a resonant frequency of 1 lc8ltp(8wg;t0 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 nl:2o v+k6ibsp9 vy 2em:sq(f 3.7-mH inductor for a resonant frequency of 1000 b nopql6k2(:+f2:m ve v ssyi9Hz?

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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 pnm18e .n*emjze hkmnu6h* 8 :placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cire hnm8. k:6z*pmn 8e jm1n*euhcuit is to be 1000 Hz?

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