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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 magnetic flux exceptd mh0,1svj .ua

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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 inductioj7ah s(v);hysn 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 ofzvomsiyh36+ip 4g 5 u19og(co loops of wire in a coil produces what kind of change on the induceg3p+ s 4ymc9vgi(ozuoh6 1 o5id $emf$, 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 ptj)z crx+9.s,etn)iu cipc(2roduces what kind o+cc( c rts xp9jien)u2.,)i ztf 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 produwm)gp8f3znin pgp7 7 qa) /-naces what kind of change on the induc gm- i)nw73fp7 pnq gap/an)z8ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic f5 fph lvfid99-ield 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 la: cx9v.mb.w xpw, the direction of an induced current in a conductor will be that which tends to produce which of the follox:9bv pwc. xm.wing 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 ho5m:8lf1 y20y dumoxztrizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abo o 2ud8xl:y1 tyf50mzmve)

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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 7:8e4fk-qnnovxc 6mbu 9t/a ois held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet indut/a fxnmbc-k6:qn8veo9 4 7ouces (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 f6rvv-x )n. iwaf gm:*a region where the magnetic field vector points stra-vni).:a*v6 gxf mrw fight up. The magnetic field vanishes 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 a level table top in a region where tt:tudf6l1+g qhe magnetic field vector points straight up. The magnetic field suddenl1q+: dftlu6 tgy 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 m),gmug* tf4kkvdi v 38su(m; uagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direg4u d,ftv*isumgm8v k;k)(u 3ction 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 auu e +pywn-4lo*xn+ u(n ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wheuluun(oxnw+*+ py-4en 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 wirwn4d mo4:elo) e with the north pole entering first. As the north pole enters the wire, the induow 4e) n4mold:ced 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 o/aer 8fmkoo/ss5* 4lis rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic s 8s ol5f/ e*rom/oak4field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speedn-e9bg czth; ; about an axis whose direction can be varied. In a re;eg chzn-b t;9gion 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 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. v 2 trqo96c ts1qhqy77ydlb70
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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 tha qf5 wda p(t7wh1yw2+j2nhzw5t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. a rfvt9 wekcbg:fv5::--wds) 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-wauxv*v6v m -te 3m;aj(1 ux9ctest direction) is moved northward at constant velocity throug3xacmeu-avtumtv x *j9; (6 v1h 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 velocity af-xgzs /jnvr17 40z s;qt 4bx$\omega$ 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 tran7 n cl*kfb0y*dsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. Tu9fuw03 nsp(phe frequency of the w p(f93 upu0ns$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used,i iuve 6(71jcge/nkj 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 w:y0 mw *gn)l3aep6;l f gg+hothat

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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 coabtr+o 0dzeg4my; q-edj85: co)vq 5til contains more loops than the primary coil then it is atb4yv5a;e08 zc+ o :5q -eomdgjt qd)r

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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 therliw i+8z a0 khcg6, fc;iy;4z secondary coil the+ikg6 i i0fzzwhcca4l ;yr; ,8n it 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 inf6;n a)na t:oqput

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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-a0c * g9wnw ml(fzi-auit,

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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 anbe kq sjil-,38 ideal battery of constant terminal voltage. At the kjil83 ,q-bsemoment 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 inductory.,vvjh qhv ;6 are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volt;.jyq v hvh,6vage 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 resis htf-1ej -0zvm+i9ju ttance 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 inductance L and resistanc zka5fe9vr5 ko6bubw0 r z9t,2e 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 baty*s ;e5m .im4hgxewn 4tery. The time constant for the circuit represents the time required for the curm5yhse x emi4 .wg;n4*rent 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 con pz.y)oa2.u tmnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time require. .uzmay top2)d 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 theus2m6bxhoa/ ; 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 cirbeidu )it9.ft6rq/t8 cuit, 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 connecteqos wr d9g(ef0/m6 uu2wsc.c3 d to an AC power supply. In this circuit, the currentmwecqu.cf 9so362d 0 (wursg/

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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 freque6, oeo c 3ark b1d5s.53 bufkty*bbbd72r-ggyncyoscyokf32y b1d635bgk. bate5gu7b-, d* brr 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 vzaw ao066 2v 8rqfuvg rw-)b1aoltage across an inductor is doubled, the inductive r-wa 16 g2)or zq6auvbwr8vf a0eactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, thevoq+kmfqkfv5a t n79j(a q9 -) inductive reactance ofmf vajqtq(7fa 9k59kq+) ov-n 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 qqkxlp ,-(,a6 vv tu ihfg6nk-kk 1)y*supply. In this circuit, the currenkqy,t k nav,l*xf)pvuk hi16g-6(- kqt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by j( i/6eia4dilnko j3ko (75t1 u2qeqxwhat factor when the frequency is trio iai4uxjk 6ol1idn(3(7/2 jkeeqt5q pled?

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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 capacitoreb).t0 uw (trg approaches zero, the capacitive.g(tur twb)e 0 reactance 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 inductyn*szck m92/r or and capacitor in a RLy9nz* /ksm2rcC 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 circa t6zp)ih+ c+duit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if Riw9, ixsldf 6*p5ass ckn.1 wr,;5mkg increases. When is this state5f9s w*k,;wsk gdx.,i6 r lsm5cani 1pment 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 circu7q5kg hty*g h*aj+y, *wguo m0it 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 serie6 imv r zhf0tr0ju9b 08+l7huwosj (/es 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 double ip;9/64 b0ygste ldxr1hb mcu 7n an LRC series circuit, the reh/bb0 gd1;eu6tply7c rm4 sx9sonant 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 ap( a;jl; uewuxde(2vn* plied 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 occurx qrro5c pj/v bq7b)6dvz 4x8f+,fm3ts 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 uni rpn1g z mm;vnsjsl-- b/1eb+1+qc(ouform magnetic field of 0.20 T. bq+-;1g+ 1ves-sncro(lb/znu1 pmj m Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ,c4 2p4qcvey pmagnetic field of 0.20 T. Find the magnetic flux through th,4qcvc4p ep 2ye 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 0.1h4)joxntxk y)62 ij z40 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 at an angle y2xtkzij4jhno6) x)4 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 singlerrc bmex *n* o1vn,fl6a8+pf hk,q5(w 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 chanyzq;+b2qfmr 05mpz+ qges 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 tuzgt64 f3c: 77vcmba kmrns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the ib7c:67kz 3fctga 4mvm nduced $emf$.

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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 wir5zcvimo8av2f i4n+ *7 u46z.ll2hsi3 cvswcze with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns a4do c nou0s2dioc7xb+ .(x,x)c1ha rj nd 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 horizontaew* +l t0./aw.i/k6h uj*pstwic ,lhplly at a location where the downward component of the Earth's magnetic fiel/ t,j ls6 wec0a..w*/*iihw u+lpp kthd 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 angumek6rh/ va*/blar velocity of 2.0 rad/s about a vertical axis through one of its ends6 b*/kvrhae/m while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of st dqjl,;p ddcx067r9$0.25 \; m^{2}$. 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 10 (iwtgg-d/8*8(h4bc ov 5lt vc trziq30 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 loopzc z hmpov3)g7iof*5 ; is 12 cm long and 8 cm wide. Th3z oh7fm5 o z)cv*;pige 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, 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 ab1ljv8b,b :farea $0.090 \; m^{2}$ 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 +.kij.lakv5bm*iy/v to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fielib/ v ay k.iv+l.jkm5*d 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 gen fx l0iy-e ouoz4*m7 zr0m5)vberator 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 motor have a resistance of 6.00 W. zc+6vyxwvwmn/n9d x 8;oy-r 4The 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. ;g*wdb pjdsfdcat *u6-q 7t)/ The motor operates on 120 V AC, and when running at fuldstbu* 7p6 a; *gwd djq-c)tf/l 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 7lrts7afl 9/n/ qutuut)5:xh is connected to a 24-V power supply. The operating current is 1.0 A. What is the l7t7x un5u/uttf)ar9/ hlqs: 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 j.;vx*x(mn ec(t; ucspower supply. Thc;e m.xu(( njxvc;* ste operating current 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 interna1rjf6g .eyx7q2zi6pdl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whe dq7 r16jiz2xgpf6. yat is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage o(lha; . ujbk;bf $120 \; V$ 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 f56mni ).6rrypswm b x tb*s7.tlec6,xlow in the secondary. How many turns aremb56 b 6cx6ysetpt*7 s.,rlrw ).mxni 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 24-V q4ecr892 ;xw9rgkp rdsecondary has 100e9kw dc9r g2qx8 pr4r; 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 secondabe2h k/pq8*7wefqp 3ary coil. If the current in the secondary is 3.0 A, what is the currenaew2/37 8ppqbfeq kh *t in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming u kp+2sy)e hwj+03zmb 100% efficiency, how many amps at 24 V can flow in the secon)j u+0ym+bkezw2 p3hs dary?

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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 s ) d;utg2iayvtt.3;jprovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?yta;;3 tv.i2dgt ) usj

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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 0y owq m9a.q,9w y6 d*ree:r*mwb rc5von its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltagerq9:*.6vrye09e5 wwmy,*aqcdm b r wo is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 8 sv:);jb;es87n4rokyj c6g 9lw tvjf300 turns on its secondary coil. If 120 V at c) 7jfsjw4ln y6b8grot 8vkjs: ve;9;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 transfo9kmwi)n0 ;h2vi s,g o2ef6bvirmer has 100 turns and its secondary has 200 turns. If the input current vsk)ii,0f;mnw g22 ovi 9e6hbat 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 has 100 turns and idnh (0xaz1 w4 cldsx2:ts secondary has 200 turns. If the input voltage to the primary is ln:h( czd4wx sa1xd2 0100 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 100 turns (,qleug5z odgd/be ,-and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of th,(zelo/dgg 5,uq bde-e 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 60dx t,rq29)o5jtx : bxk A of 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 secotb9kxrxqt2xj:do, ) 5 ndary 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 usr)e6 wjo7/ptykbzeql ;w c,/ :ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage pr bk;ce7q/:ewzpl /t),yw 6o jower 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 a9r uqx 4e;met3.d zw1mt 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 percentawre. e1dx mqu3t4m9; zge power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc(:ygkw)z*t ccw 3idf 5n kz/thxq d*nod1 j.7.e 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 voltaghz)k /kgwc(.:3tozn*j dnfd51*ctqwx iy d.7 e 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 resis 3yyc6kej9;kttance of 0.60 W. A generator produces 100 V at 70 A. In order to rek j93yt; ek6cyduce 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 c kx*w5csh xexr7nd j0458: erwould be lost if the power were transmitted at 3000 V instead of at 1000 V?xxw50c4rkx e 5c j:8ders*nh7

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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 i2yr n+gw5yoeq041 d c i:e7fp+qi jlw(s to be transmitted on a line with resistance of 0.60 W. To what poc:d2y74 j+ei gyrel f5w0n+ (qqw 1ivoltage 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.n:wcr7a8,vfx*ds wamd( m /- t0 A. How much energy is stored in the coil's mag arf:* mdawdtnx(mw/v7- ,c 8snetic 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 6.0-W resis jwmc(g;rg6) btor and an 18-H inductor. What is this j;6g(c )wgmr bcircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage uiem) y as09n k:e1+jvis 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 1 +d(jy+y-1m;iwxke (zogkgx * 20-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. :2jxvi3qmkrldab-ay00 9+pv What is the resistance of the lapdj0b lqm r 0vka3v aix9:y-2+mp?

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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:pb:yf m )q ddk jc6481 f/kkjo-fygb.-V ac power supply. What is the peak current 8k) 1cjof by-6yj:/pddfgm4:q b fkk.through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power s754jscw yfs 5dissipatw 5s7f yj45cssed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is(y(z cr tmlv6 kngkjk;jb.0 45 $I = 0.80 \sin (240 t)$. 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-e4p*d:eh t.5m xzrt g8W resistor 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 resist w9)vio8 jou7vor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH tkpc b*2qmp132z/70mheswbtinductor 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-m sr q1haa+z1a:H 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 1gt).7+b5wi+ lhx ag :vgd;l or4.0-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 inductive)l;y6b*b jgnq 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 lu 3xq ilhqoljj1c):/e )kg-d*)) oitwhen 120 V AC at a frequency of 20 kHz is appl k oc:/1jiu*j-))gl 3it qxeo q)dhl)lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil*e7 x t:h(bym.us9o ltnks(w1h b8) ol 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( l1c)9xawy gu;w(nej 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 reactancet-gbwm*qr7nq g 83 p0t 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 lq 2-5us3 mag*7aqvg c10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance oupotcvfp);h6 l7x;+ sf a 0.010-mF capacitor be 100 W?l)sp7pt+ vfuox; h6c;

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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-mF capacitor at 1000 Hz aoletpy 9.)- khoo .qq(nd 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 resist4l cvscok81p ;4zp(gcd8*oy qance, 15.0 W inductive reactance, andc4o8c zvdpyg 4 ;kq8os(c*pl1 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 resist.p eizg 1o fa7.f,.qvfor, 20-mH coil, and 1.0-mF capacitor are connec vg.ap17,qe. foif.fzted 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 angztt;iwm;iu0r+ah : g6le at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacruw tig+:h0;mztia 6 ;itor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20o nxtku:*uc4;4cha3 y-mH inductor, what is the impedance at 1000 Hzc; :t*ux an 434uhyock?

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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 id9tapc 0w5fr+y2khsa :sm)-20-mH inductor, what is the phase angle a5mc da9whf+y2ps at -:0rik )st 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 nem5w 8cc wyax+ u0sx1xj3 eh0(gb- nkh9eded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a to +bxhg 3x8ecn0x5 -amwsj (09y1kchwutal 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 series with a 100-W resistor a.r 6 crullish:.-lx52urw3js /ty2g bnd 15-mH coil to get a total i:tu 6x u.sryw- c5r sb3 .jilr/g2h2llmpedance 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-mqu19tj qo,hzp0 3fod+H inductor at 5000 Hz for a total impedance o uhjpo qdtzo1q f09+,3f 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 r,c q-znc(vdmpp*, d:y esistor at 1.0-MHz for a total impedancenzc ydc,(pqv*p-,m d: 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 c+*+ib x0 abtelapacitor. What is the impedance at 1*ebabil +t+ 0x000 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 wio aw/9y sh tkndn2es8tnxx)yp,:/(u 0th a 10-mF capacitor at 1.0 kHz for a total i tox n 0kusn/hx(t) ,nas9y y2edw8/:pmpedance 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 capacitor at 1.0 kH 9xn4uh6:d::xz n9eivp /iqsdz for a phase angle ofx/z6ds:n hpn4u:e9:q9dixiv $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor a 7ex*c c7bmq/ at-s+pht 1.0 kHz for a total impedance ofs-tcb* pe7+7qm h /cax 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 s vhxy+cgox/:hv() eb,eries with a 100-mF capacitor at 120 Hz. What is the phase ancv boy() v/:gx e,+hhxgle?

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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-z9;t+dqqc 39qce x61cgxtu 0ymH coil, and 1.0-mF capacitor are connected u3q16c+ye gd;90 qctz9x qxctin series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.qoh:oz*anv.9dk0. s c 350-H inductor. The circuit kz ov* onq:s09a c.d.his connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of sh;1a r3z5kgtv1( fckcapacitive reactance 30 W, and an inductor of indh;(1 gkz3rvs f5ta1ckuctive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC n:b6x h2 ce+igcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indug b 26ihc+:xnector, 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 neces2 q(.zy wl5lxlsary in series with a 500-W resistor for a phase angle oyzlwxl2 (ql 5.f $40^{\circ}$ 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 4wm6vq mxc3v 0uc+i8e W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powerevv8+ mcu3mw4ix 6cq0 transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.gz2y2wqcab vnaks fd9 917 68o0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when 69ksw82fy qg9ab2 7a1 zvd ncothe 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 anu3/egfl3ejhi5isy i a; x1 bq2: jn93b 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 W and a resis,9h:dd wit.hqw 2+v tnm.q t)wtance of 30 W. What is . +2ndwthw 9v.wi:tq,q )mt dhthe power 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 lafaw. u q p+,3ytt(cup;h4 m:*sfr7gseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductohacsf( upqutm +f*w a,g4lyrt.; p7:3r, 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 e/d5a3 , t-a(dmjfuxboq9o+ n and a 15-mH coil in series?+matbu 53xqo nfo (/,9d dje-a

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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 ca2l+j -:wg-e adpz0yk p,wfzc (pacitor for a resonant frequegy a0kp-z+wz-2dj pc:e (flw, ncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant freq0jl s+u bfg:ad n0s3p5uency of 10s03 5s0jlgdnfpu b :+a00 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 f wv+ 9z(5cuo-krv0 oq30-W resistor and a 40-mH coil if the res0u+fk qo 5v c9rwv-o(zonant frequency of the circuit is to be 1000 Hz?

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