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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 v 3 w4ajvao9vs96o46ql d,c ob5x1eciagnetic 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 the izy2t/6a 8 r6mszxit1d o-(jl$emf$ 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 kind m4ec:f8pnpd47fqiz j*af3 8kof change on the induced3fza8f48dc:p7 n em 4fpjikq * $emf$, 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 u az-wzp;4w*omagnetic field through a loop of wire produces what kind o 4aouzwp zw*;-f 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 aqq621ym odng y:tq8z9 loop of wire produces what kind of change on the induc8zqy2m gody q:t 69nq1ed $emf$, 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 magokmwry2dft: 7 f ti54*netic 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 inducl35*ru s9 xvoled current in a conductor will be that which tends to produce which of *vxll39s5uo r 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 horv wb4.qx/:bv . v7ioidizontal table. A bar magnet is held above its center with its north pole pointing down../ .7bv:o vdxiiw4v bq 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 held zugmbs+tebnfe qf3)e)v .+/ ;above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induce+ e3 unq) vge)btb zef;+sf./ms (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 magnerwso. dxp3sv e*rx .10tic field vector points straight up. The magnetic field vani3sx.rd*wovx1 s0er. p shes suddenly. When viewed from 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 at4 iufp c)1m*r6d2zr l; e-vlz level 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 fzr4 mt-2;er pflzdc1)*lui 6v ield 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 magnetopj 0zfc0o2 : qj/veo. znl: ,sip0gil7wlc (7ic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the indlgwfz.j,zn :c0j(io 0v/e2o: ilcp7lpq o07 suced 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 64 fgyvf+d5zcar+g/fcarries an ever-increasing current northward. Twg4c fvraf5gdfy+/+ 6z o 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 tuprjp i(6p ,dy:r 6kh 3zx(ct9he north pole entering first. As the north pole entertd :p (j,pxrkcy6hi upzr(936s 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 rou5 +*pr,hz*6sxpu td ptated 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 orientation of the loop's axis of rotatip*h, p s *tu6xpr5u+zdon 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 an26) 1:izlrjs ets;n vtgular speed about an axis whose direction can be varied. In a region where a uniform magnetic fie1jnz 6vs; 2e)ti :tsrlld 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.1; aab( w1q c*vntvz1g
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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 thazixnrf6 izc,bl+3k22v zfbd1k m2sdoz:.j3( t 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 fieldr(tvgx z79))h8j ltcb. 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 dire0r n xrqeb.o5+ction) is moved northward at constant velocity t0+rone5 .qrx bhrough a magnetic 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 constant angular velocitl*t(8( yp fiw2ai.u cqy $\omega$ 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 transformso noujcs1x- +3

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rota v ttnrz0 n-)0fk2t:mdtes through 60 revolutions each second. The frequency of thvt-nnfr 0 kdtt0z)m: 2e $emf$ 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 us .bdrhe(.9c.b 4efq0 (ckwr.oqqt )4czdb+a ded 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 dezxpkrok 5qt,573xlg 4vice 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 kot)o g: rf,g*trac7vp06+ oy secondary coil contains more loops than the primary coil then it+f6googa :tkpor,0 )7yv*rt c 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 cokmqfm mobph lc2)s*(af/ez45 qho m5g95/3knil contains more loops than the secondary coil then it isaf k*5fgcmqo/ 3oh59(b5khnpeqm s) / lz4m2m 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 inp.v6dm -i d1dmggj2al(ut

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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 lrqbf v*m7)9wtm mr;1 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 to an u rn4.xvdtp)2 ideal battery of constant terminal voltage. At.p r)v nu2dxt4 the moment contact 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 connected in series to an idej*g;2c a x /my)mcyo-wy z8ig+a2e wt:al battery of constant terminal voltage. At the moment contact im28*x w 2ac eo m:ayytzi+/y)cgwj;g-s 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 Lv)t f7:-t dh ; esm5hv: kbq57f:qgq*ijwmrh 1 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 bc lq,(nw -c3f a)ird6inductance 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 battery. Th ud2:63.xs oysxs .feme time constant for the circuit represents the tim .y3s2su6edo : .msxxfe required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery isid66w d-m rara2 t1boxnyyg) 58.rm6y suddenly removed g2xi5rtyr6b) mr6-n wy.ad8 1ado m6y from 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 un+x. 3,fap;l1q il) b-ijp vnuwits 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 sux0i28c xnfkou 7 e2ke9pply. 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. In th ut.u8 qq*;o zkf1tz7p kh;(bvis circuit, the currenkftkz (; phq7u8zt.b;o qu1 *vt

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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 3),efoh, fnb8 fq jh4qan ac circuit changes by what factor when the frequency n,fof3q fq,8)b jheh4is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, caz-ikxmj /2(pn)us 9 the inductive reactance of that inducto2-jcp9 sku/(x ai )nzmr

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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 voltag; ghav0ak v*,e-zifh+ e across an inductor approaches zero, the inductive reactance of that cov 0 h vaez+g;,-h*kfiail

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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 tw6d9 owaoyus* c7;wjqx+7.uy o an AC power supply. In this circuit, the currenty97d w q7ja6owcsuow;.y+xu*

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanc2 3emn :tlc *vk6cozgwsnq7448z)b dbe in an ac circuit changes by what factor when the frequency is tripled? 8kc63* nbdc:4zt meb oqn4zsg wlv7)2

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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 approachr 73*ig+ker s hz.nf(1.xtgkyes zero, the capacitive reactance of thagr k *r+1 .eih(y3.sgkznx7 ftt 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 induct :wlrzdo;i) f-or and capacitor in a RLC series circuitrzl f)i ;ow-:d?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined a 3mnlxk(.f 4cg+/uj qhot:.u ls $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incrdyl; cad kzu6/6ej+4. vma,jieases. When is this statement tj azila4cm6 k,.d ye;/jvd6u+rue?

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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 impvvs um:y: sr u.hhmm3i7ha6o -q5fn 7-d4lt3 dedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series cirad q2nbo7+jq9(a xb8 h xflenj3g-l8)cuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double h)t nr6qngqm hcd5131t8vxa 5in an LRC series circuit, the resonant freq at)5d htgr6358nxmq1 chvq1 nuency 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 ACrk/0p/2hohzhdh: y9wuj// qj applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occuclu xb4lvhv r i(7811yrs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform 2dvk sx1iqspu 18p43zmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of x4ksp ps1qi31d vz2u 8the 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 a uni,1. uggar)zq zy3ks5nform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loos gr .gkz1,5nyq )3zuap 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 magneti e,tdukx 3 ,,zgc3b 6pmx9,lnhq3f l;qc field of 0.20 T. e,l3dpuf,hxlz3m6k9 ,3gbcn; xt, q q Find 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 re1 jz1g.)ny lulp8 u*pbduced 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 chah6r+m ke5g9z lnges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square fr uap52idh+6f1ti,qgouf :8 mm ,bv (siame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fdtf bq pg(1ho u2,ivmui:8 ,i5f+asm 6ield 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 areau hfu .20lo. ccutb88h 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 a he15 xfy- zljv4zs.9cnd 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 ab h;uatim 6j46t a location where the downward component of tjau mi;t46hb6 he 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 j.dre bpm lltpw:,9(:is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical tldp e,w(: .lmr p9:bjaxis 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 pthz)by- - cb-tf05av 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 turns of wire of areaa6:vhho35r cyisbh 7( u(8zkj $0.090 \; m^{2}$ 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 rectangular9hcu +z raie:hiu5 q;q *(dno+ loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rzidu+9 er;5 (uahc*qohn+ iq:otates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be 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 108cc; hbk)q0cgn76 yd m0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC genery,v)osj nt6o-mliu1 d6 8jx .yator with an output of 12 V maximum when rotated at 60 Hz. A magnetic f jo6 tyoi.x dnvmsl8-j6yu1, )ield 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 genb qbamr8lumg2/0l bnm8me.y2g*0lx -erator with 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 )v c0tfdpn0 7ux/i if5motor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The -xvb;cx oo4i oc s; g-h364qnsmotor operates on 120 V AC, and when running at full speed it generates a bagv4 ; n64oiso qc-;3 x-oxbhscck $emf$ 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 resist +62ffi/zi rpt x06rzhance 6.0 W is connected to a 24-V power supply. The operating czxi/6+h fir0z62 ptrfurrent 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 power supptbnq70s: q3 ktly. The operating currenqt s3 k:qb7t0nt is 1.0 A at full 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 resi(v 7 8z +eo ,f +kehhtxu+0)vuibvirt9stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is tzh(he0kvreb +x)97 u +ii+v,u8vt tofhe 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 transformervqlxb l.*qp5hc(5 :pz is needed 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 t7u1d0 v/bed t2t6ueh1,pj0sua 5sq y uo flow in the secondary. Howeh7esa /, udq6d t15 juspvy0ub 0ut12 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 in a 110-V primary if the . :b6,2bb m,b5hwwkxqspugd424-V secondary has 10shd bb,,4w 5 qu wpmxkbbg6.:20 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 cp9m x5bdkqpck16q7qn qu.i9.9*baumqqd m ,3 oil. If the current in the secondary iqqdnq*9m5cmm.qbpa k. u73 9 kqpbxd96,i 1uqs 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. Assuming i io6a6u4ui5+qlingn.vtok 8/ g+ 5wl100% efficiency, how many au 86/.g k5nw+ini6oi45g lo itlq+uav mps 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 7500 V at 10v em3m1v-nv e3.0 mA. The primary en 3vv-e1 v3mmcoil 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 primary coil and 300 turns on its seconu 9)dp .rfg:ri4wdze; dary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seconda i r:e;)g dfpu49z.drwry?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coilk 7 1qo+aeohj 4rzjs25 and 300 turns on its seconh akz sj547rj2qeo+o1 dary 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 turns and its secondary has 200 ta;oreg+ 4vzdit lp2c/ wk f93-urns. If the input current at the primary is 100 A, we can expect the output current at the secondary tovl izr-okf+3 t;/g9 dp2ae wc4 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 200a,e(yhmr ie9b0-i1b clcqzy 4q.3hz+ turns. If the input voltage to the primary is 100 V, we can expect the output vc -zi3 bl. +(zqh0eyb i49c,myq ah1eroltage 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 secondy4 w;no6ddn) w /+xq1 uqi;vpzary has 200 turns. If the ;p4 +n)1yqxio;d zwvnwd uq6/power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A p+y / tpx)+zogr20e aoof current at 120 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 secondary if p++2tezoaygr)o p0x/ 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 pzi*hyu+ 8ylgm tdq599p s+ .h120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line *9.g9duhpsyy+p+58 h q lit zmof 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 usual)ve4t*i)*n7 rghv6 s mf,: mmdqmklb,ly stepped up hvb)mdk,v*,mfgmq6ml i7) *:rn4ets 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 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 tw6w)bq8h jk wefpe a8pa 6a8*3otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energ88kf 8b w6qapaw6a*j h 3eew)py loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genmg30lt:okep2 ly2i.cl t1 /n ferator produces 100 V an:2.ckylpo2 /efm l l 0tgti31t 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the 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 would be b 16p 0v5n-uanjv f.2gg gqp9qlost if the power were tra20p vg nvn g-5gqq u6j.f9p1abnsmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transby6 -a4x i;)dixheka+ 33iybqmitted on a line with resistance of 0.60 W. To what vyqxb be-)i;yh dia43x6aik 3+ oltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is st (r1j.9+e k tj:dxxfmoo(hd(jored in the coil' (r o 19tj:dej+o.kdfxmj( (xhs magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a )t e +9954ft4rhvsw3xetcq sc 6.0-W resistor and an 18-H inductor. What is this circuit's time consth9ctc)3s+ 5x 4tefst 4rvq9ewant?

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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 vol d5f/e. /ulbhctage 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 12okc7 bg;5w5*7vu:bvropg9 ekr a1-pa/rw t5h0-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 ammh0lw pf28pz5r m9nbxrr16 3 120-V AC outlet. What is the resistance of the lamp?xl0m pfrhr8w26 rm1bn5 pz3m9

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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 thetz m,po *ng +u+ky7iw: peak current through the+y uow7+kptm zg i*n:, 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 1 gjqsl-m* 07yx cw;p1o20-V ac power supply. What is the power dissipated in the resisto;lgwxym p -70sqc1j*o r?

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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,jlbh 8. uafy))wgg/2zqo5c g0-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 resioxznr ps2 t/ d20n3rp0stor 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 50-W resistoreb xpx)-h t,r)le 3ua4 is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 144kqrkm )hpv1 .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 co 3hx: ievx,fc) dt9np8il 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 willcb+7 vj ft 0ekvkat/nr7cp ..7 a 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 ofvw/w6tlruy 73 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+rzqq/ 8 rsfwyoc)/w,g2,f dh0jvw n* frequency of 20 kHz is applied *w/ )+sndw0j,/yzw 8ho rf,qfq 2gcrvto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 it3y.u /ov rd,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-myou4.kgww8/ wF 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 capacitive reactance at 10 kHz?j1jcb2cwu3bd79 a 0ew9bfbn-

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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 reacta78/:lumdcdlq jh z+l,nce of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0f j8jfe)ti+8u10-mF capacitor be 100 W? f)ju8+f jit8e

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mudc;sbr , tu:k46p9 wyF 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 o- .7qo o*lbyutu h/4xseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.04*u7lyt.b -qoo/ oxhu 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, 20qhmip02 nmx7 5-mH coil, and 1.0-mF capacitohi0n 2mxqpm75 r 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 resistor, 20-mH co- : fw*.uyfa *kcebzv *)dd,hzil, and 1.0-mF capacitor are connected iz**f v dwb,-*kzaf.yd)uhe:cn 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 connectsd/j h3-c,bew)lr( rled in series with a 20-mH inductor, what is the impedance at 10( ldel r,3cwbj-hr) s/00 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 ,9fe d0ysvya4 is connected in series with a 20-mH inductor, what is the phase angl0eys,y4dvf 9 ae 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 wit e+mi ,zgl;9p4 f6:rqs)vzspn 5c ,b m-uahnr9h a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W a6ne sz5sipvrpm hnlu ,c)4,+a;9r :qb-g f9mz t 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 series( u k9e0 wuxo49rrr un3 7b16ac04edaeya oii, with a 100-W resistor and 15a9r7 xee d1 46(aina9er403 ywubcouu oki0, r-mH coil 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 450a,,(i1n 2dyoxllragv,g *dc4 -mH inductor at 5000 Hz for a total imped,y,vi ca*d2 grol,anlx( 4g1dance 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-fk i50gf0n8rg 2s+pqe MHz for a total impedarge 80ips0fk+q g n52fnce 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 im4(f/w )b jgmbbpedance at 1bwj)(/ gbf bm4000 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 withkt1*pw3 t, 1ir+v(tomvuzf 8. c 9gxwc a 10-mF capacitor at 1.0 kHz for a total impedance of 4w.(mitk,*p189 3vf o grtuc+zc 1xwt v5 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 serie gg()chbau1 /pk)l0njs with a 10-mF capacitor at 1.0 kHz for a phase 1p b/ 0nj ghk)ga)(lucangle 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 resistoq,j3e p s 8wbxnw3tuh)n) y)d:ysee/; r at 1.0 kHz for a total impedance of 45 W)t/)n);es jyp3xn:w3d8sew, u yqbh e ?

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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 seriesv-x0mt g ojnxwcvl*,8km( , 7v with a 100-mF capacitor at 120 Hz. What is the phase ajtg, nc*70kmxm-v( v o,w lxv8ngle?

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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 resistor, 20-mHt6i v-l1 ru+lz coil, and 1.0-mF capacitor are connected invl+ r1 6lzui-t 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-a9t3-wnfn 4o.jy pvv17sp qkx x-ie39mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What inxt3vq-794j vw iknp1xe-3fs o9ya.p s 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 capacit+tp eueg 7y snqn)e)39ive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourcqn7 )9+typ u 3se)egnee. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W rzbm8 3fq; te 2tpyd5+aesistor, a 10-mF capacitor, and qybf2eta m;5p+td83 za 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 necesss .)m qha2:ao8 ghf/jf ,iczo4ary in series with a 500-W resistor for a phase angle of qm/ a,ofiz :) 8fcogsh.a2hj4$40^{\circ}$ 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, j cj(8rya jj7n mm7+j:C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power t jyjjj+ nrm7a8:jm 7c(ransferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W rep7gqn8 llh2jy5ahx 2; sistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wh8 nxaylp52;q 2ghjl7hen 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 circa ;thlrl/ uyz/wt,1 :juit 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.* dssm.o ,wz3y What is the pz.dwmso ,3sy*ower 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 seju;1 d/t 0hwk*l4 (wugi5kgaipe d. h/ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whjw*u/0 h5(d/ei aul kwt dg1p.g ki;h4en 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.e vg-q.mm;w: ruvgf . a 1.0-mF capacitor and a 15-mH coil in series?vr.g qfg.wu:-mm ;.ve

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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 sev8vf)dgh*oa.oj 6xjb :8oc g8ries with a 4.7-mF capacitor for a resonant frequency of 10 kHo6g ) jafdhogjx:*8o8.bvc v 8z?

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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 a resonant freq +p jt*rz* c+oo6iv+jg. ui/gguz/ +ogo+i j. *ji pcutgv*+rg6ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series zd9c/v ams,u6r:v dc* with a 30-W resistor and a 40-mH coil if the resonant frequency of the9*/cu:z6dvv ca r,dms circuit is to be 1000 Hz?

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