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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 +:kw6gwf:hopem4n1 z0xvx r 6 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 rcdh2y gf 33uu8gfn:(uction 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 l,a3c6 oa1p dhvoops of wire in a coil produces what kind of change on the in aa o3cp6h1,vdduced $emf$, 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 na, ez60a nrk1i3fcn0 field through a loop of wire produces what kind of change on thek fn16c nr0z03e,a ina 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 iy,:vm sb)e bty) 63uemuuf.7loop of wire produces what kind of change on the indu ,m 7ye36itf busu.ey )vm)u:bced $emf$, 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 magx/y 9vl6)j 9et+hzhbgnetic 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 in:nu8a(rdmd q57 s5o:f4 gagzzduced current in a conductor will be that which tends to produce qg rzs7 z558o (ufa:dnm:da4gwhich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet iskocym: n)*b+ c 7l4yiwn1v +fk*u+mkw held above its center with its nortcyc+m4*i1f7uw*kb lnv)onk :w+ m+ykh pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablec0zstc+vnd tny/:3yfq5 *yq1 . A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falli1v0ycn5 qtyy 3qf/n:zs* tc+dng magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top ijrfi .)1jcf3y n a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, fcfj1irj)3 .y 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 or,8nc73(l3(bn ol b**4 x hqhbkamb9 -fy hahin a region where the magnetic field vector points straight up. The magnetic field suddenly grows stroc*hh-o( fbbblyo qn4,k79lb(r a 8x*amh h n33nger. 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 regiov n7m )nifn ,u wfn03j05 5cna60zezjgn where the magnetic field points straight down. The magnetic field disappears suddenly. When5gz3fm70n0 e5f, jn vn)a6wzunj cn0i 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 -+zu (aynet 3nhorizontal table and carries an ever-increasing current northward. Two coils of wire l-y+z 3unn( taeie 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 88sfcj5x; g(girx (s ploop of wire with the north pole entering first. As the north pole enters the wire, the induced curx ssp(c ;5( 8jxfg8irgrent 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 constant angular speed abou wnk x859ibnfv*sym9i .c/7jit an axis whose directiy/m 75nji.8 cfnwkbxiiv9*s9 on can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant an 4vu4d66sawp m(xag; myk;s k8gular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must 4y;;wdaam xkmp g 6(6u8k4ssv 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.f ss,yi(xze /l2k7(i4n fi6sjb( w+l7odwwl-
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a2p1p9uta(;xv4jvxp gw6cizp 1- eq 3 cn $emf$ 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.-/zv4fmg m8ta8:b xa n 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 directionl */s2shgpfi9qfid(7 ) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the l(72/i*9d ffhsqspig 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 bar8 cm .1 tv0dkp)yu)efx7+gfih rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans9h ia5i5z, cb (phu;giforms

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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 revolution:v+-zwoh+ hi, c t7dfzs each second. The frequency of thehvo,zw- it+zd fc: 7+h $emf$ 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 devi 7f: el)r*x:ud mskr(6i flzc0ce 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 devicy.f /* *; d p85xoprq.dehmvzve 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 w; c nhc4wwcjdj3 k*oe,gv1),loops than the primary coil then it is avkc),w4jh cew,c wo*1 ; nd3gj

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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 8oqzyou r-h3bl c tg5; *xx11nthan the secondary coil t gct-nz813xo xqu rbh*1oy5;lhen 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 inp2 p2/ txmoqfd0x8 tpap(9 .qjput

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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 circui)nm z,g2j jj)w:;ig kou xy-b7t,

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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 ide /* zo-.9mea)rmi6+u eamuj rqal battery of constant terminal voltage. At the moment contact is made z.*uu/+qjemar mr)e6-o a mi9with 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 i1q ajf0to;ml2x1w 7krftu5. xn series to an ideal battery of constant terminal 0.x jf 2; 7otfawuq1kl5r1tmxvoltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance Rz zegpwsaw9i - cd(9+r oi/9f7 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 resistance R is conneu) fj r-+p,c f4g pim0hs/z)qpcted 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.vte d1+rpc 3n;02w qqa The time constant for the ci3n1r+caeqq2 pd0t ; vwrcuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery :x9 yrg3b+ayais suddenly removed from the circuit. The time constant for of the circuit represents gabr xy9:ya3+ 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 36 dsm 72riyiieopiu;n0*d:w hr*:keunits 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 powqc5 ax 7a8. lat8c-jxter supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the nk,8z xy9n.le current9zlx ynn.k e,8

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancwuu/e 3:ro)su9,9 lwsgwq3po 1slau +e in an ac circuit changes by what factor when the frequency is tri/w9w alurusq+3s 3 selp9 )w:o1u g,oupled?

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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 sk/un)uolq;se6x v u,x8n yol7 5.v doo d()i9across an inductor is doubled, the inductive reactance of that induyu8 v ,dvso 5) )dxi (qoe ;9o.nnusx/6kuoll7ctor

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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, tarvmj p;pw ale)50t0 u* il:/yhe inductive reactan0) vrjl p5ulape:0t; a m*y/iwce 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. n-)rbnby x;,u19ade kIn this circuit, the currenera1;9x)nbu ,-ny dbkt

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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 changesyjkc7:5m xzc*dm : nk3 by what factor when the frequencn5:d7k3 :zkymc*cj x my 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 i zitfd+ ;49ntcapacitor approaches zero, the capacitive reactance of that tinti49 z+;fd 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 inductord m(xebo5d2/.9ei e v;btp a/1pvo1vp and capacitor in a RLC series circuitt(bxp91 ;b/ dp1 eo5.eev vo/2ivamdp?

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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 ci/ojir oi/3 w/wb/ 3khircuit 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 i 52hajwy/ x0qz(2 vgsjncreases if R increases. When is this statement trja5jx( hqy2zv0s2g/ w ue?

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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 th; he+8gdk nxv 9+zs;dte 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 circuit. The impedance of the circuit ;iw.1qc6bp d0pmk*p+8y oiyvincreases 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 doubl iros3e7lu utb+.2 +ale in an LRC series circuit, the resonant frequency of that.ou7tl +s+b reia3 2lu 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 thaqs ;8d *bimry(t is driven by an 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 cz t8l+yfbt4dqsy h/- 6ircuit 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 radiuubmz4c3lj;+ ms 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the l +j;l4 3mucmbzoop 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 magnetvm3pp1ys 82bz2nj p1u ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and tupp s1vmz1j23 p8nb 2yhe magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field o(x t)mbg83*c.d7 e lqlalmz 9of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetigol9e lzm* amldq8b73)(tc .xc 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 adjgd, lg/e*v) be6d5 gjiustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coi9rzag7vmty 5v6h(aqn k.x5 1gl changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns :cayk+6fri0x (o cmd0of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane omy(0acx+k6cdrfo0 i :f the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area ofsx bvl4r0iegso**+9hoiap , * $0.40 \; m^{2}$ 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 andypmur-1 y2 fp1 area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where 4yx/pct04 dy. zb*srpb8e7mq the downward component of the Earth's magnetic fie*yecdmzy 0b .x84b ppt4 /r7qsld 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 cupp :e*)ktmg 8onstant angular velocity of *pg: m8tuke)p 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 hgd30ejh b4f5 las 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 consistsktubk7;d pg2ce*9 1z i of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectpk)8s23aln v5 ;:mkq (jtuwzuangular loops on its armature. 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, what will be the mavs83k:w (zultnq 2 u)k 5mpa;jximum 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 ofkh4 n;2s rr4rh)el,tbz0 3szn 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 generatoqgt .kf ;lqf4u8jhnii(zm yb2m)h32+ r with an output of 12 V maximum when rotated at y. i i3 nm;u2 82(k4bmzj)ftg+hhfqlq60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximumab m9cvqw9 75z $emf$ 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 repcz z nx xc8aqdn,((g5y5h8*asistance 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 resis.kqj1pvm-d p 9z8fsy0. ng4 ac.qwjj (tance of 6.00 W. The motor operates on 120 V AC, and when running at full speed p .ajgdv 0(.ycz9kq sj-.1qm8w f4jpn 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 p4-u/nnnst0e7u j eg:lower supply. The operating current is 1.0 A. What ie:nsg n0/4uun t -7ejls 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 copuh 56l-gu l*mtu mjf)+j lpn7.3 jd2q/z5ucmnnected to a 24-V power supply. The operating current is 1.0 p*d5 m5ljl l3m u quuu2c6.+zpf) 7mj/-ghtnjA 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 resistance 6.0 W is connectegqx9 )t,w 51hap:wv: n,yzn fgd to a 24-V power supply. The operating current is 1.0 A at full s xw,ngf9a1thgw5: :p)yq n,zvpeed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is ; p64gp5 vmg fuhj+5eoneeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow 19p0b uvql4b vekf/ n-5drw/tin the secondary. How many turns are in thedblun9r t/- v1fwbkq5 4e0 v/p 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 d f jwo 9z.8yu5.pwpr-secondaw j rp.zd85oy u-9p.fwry 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-turno,90guww ;7wsri3 eln urp* x4 primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the s u; uri4o9ger*p,x03lwwnw 7primary?

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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 ex) ,w )ex:gnm2lnhk/primary of a transformer. Assuming 100% efficiency, how many amps ae gmnk: 2xwex/n,))lh t 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 neonr1*mg 02 fnrlt sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whatrtl2rm1 0*fgn 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 seconz0z,dx wotx5/oaonx :s :gu*8dary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prozaxsuw8 5:tg x:o*0xdzn/, oesent 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 300 turns ok-)d3cw :;ajfm2cfds n its secondary coil. If 120 V atdf;k3djc)cf2 w msa-: 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 h r.7gt b,voiz3kxcm/+-i o, zwas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current k i c37-.rgxbt/mwzoov,, zi+ 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 h7rs z/ch:pch ,as 200 turns. If the input voltage to the primary is 100 V, we can expect the output: cz sr,7hhc/p 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 andumzki(0xvk -au0)2nltp + 4is ey tl53 its secondary has 200 turns. If the power input to the primary is 100 W, we can expect tp04k(zmi ex 30ty lnlau +iuvk) 5-2sthe power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at yq:ox398f ccb0 /mu za120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resimc c /39ybzoaqfx08:ustance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u3ajc (8.aa-b,yj9fzc: dbmwk p 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 transwacyb8dfkj a c,(b:z93. m-ajmission 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 step k .06bci/s tcl0vt,joped up to 4500 V by a transformer and transmitted through a power linli jbc t0vko./6stc0,e 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 line3ltta7vbo7+2b8u .c8idqg x m 50 km long has a total resistance of 0.60 W. A generator pgu 8mvti + .dqc3bx7b72a o8tlroduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were 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 q 6j0ect oh 1ybiwr2bnz06v1cmk 7,u* long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, t 06o ybhbqc*zi2,6e1rvtcjw nu0m7k1 he 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. 625p6k ovzu;. p lehcgHow much less power would be lost if the power were transmitted at 3000 V instead of at 100g;lo66kp e. vzhc5 p2u0 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 genea e ce53f8zkt5es*) kkrator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transfok *8)eks a5ek5czfte3rmer 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. Hguk+a2bqf- 1dl63y mlow much energy is stored in the coil's magn+muq1b al 6d3 -gy2kfletic 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- za1m/.a oh6swW resistor and an 18-H inductor. What is this circuit's time constaaoa zm/s.h 61wnt?

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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 p f /wla ge2c+zfp/2z0dp8s; niad38k an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet okejv 3r8g2j //tg4ku p**kbnd*rnt-. 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 a9uwd4dr (uw3kjh; -lk 120-V AC outlet. What is the resistance of the la -w4r 9l3wj;ukd dk(hump?

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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 peak curr/u- p9qe fws*hent through the res /fp-h9 euqws*istor?

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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 acb8qm rvjlb . +- pw,ehjj:kz0; power supply. What is the power dissipated in thj;+bq rbhjv0j :z -mlpwe k8.,e 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 o)u1 *fi;zm,e:sjbbj $I = 0.80 \sin (240 t)$. 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 m7vigbr ;g ds wh4x88:-l-l pya 50-W 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 resistorp5g2 fkpb .l 67 m mo*fgot0a0e52zwqz9or 6cs 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 inductor at 6l1q: pidaxs9w7 gt6a30 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hz? l8 5ce:iryzf4f1.a ia

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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 14.060bwd qzbw z4iswngm4(rl6( qsi e 246 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 ri2h tg o9rua::eactance 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 freque ,- ok+7fakz (v/:vwvioj so7xncy of 20 kHz is appljs-oaozwx :7 /ifk, 7vk( vo+vied 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 due to a 110-V, 60.0 Hz soavl/7 in3:w3n4unafd urce?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitivo1+ qb 1u 8phfr1vvpv1v5py 6.2gxoswe reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reacta6eg+ )w, tzwvance 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 1p x zlkgz7f.5-0-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 capacitiv q6q fxnj;,2/1a b5uwwub )qxve reactance of a 0.010-mF capacitor be 100 W?,xq 1v /b5nu ;)fq2jwqxa6buw

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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 and 5.0 c:/marxm4. 0jc :u op+je7aw bV?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedancbv(fx 3 3na,+tp ;0mmohz d7tje of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac m37hvao0+pmt ;jxtb(z3n ,d fitive 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, mu *t yygm4llsws,4, rj);y/y20-mH coil, and 1.0-mF capacitor are cyt m/4l)ygs r mj;*w lu,4,ysyonnected 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-qh /oapa85cj sd0 ,7pcqrv8u1W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sea1 8ruhac 7 jq8p5 op,/csd0qvries?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inn /4ewdlv leto e99)g8ductor, what is the impedance at 1000l89neelo v t)49w edg/ Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what tz7 qf93qun87y;hla vie3nv 5is the phase7vnyu fze aiq ;qt9h835v7l3n angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH n b,72/ j1kybppb4b dkrw7uec/;i4tkcoil and 1.0-mF capacitor for a total impedance of 1k bpbiy7r ,b / w14/t42cb k7edknpju;00 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 aj(hycm-l6 nhj,l r( o r8xr-3ynd 15-mH coil to get a total imr (3rj,-y 6hllcxrjo-m ynh 8(pedance 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 ser/(c 7s* y+ibsuwbsu0eies with a 450-mH inductor at 5000 Hz for a total impedanssiu/ u+ bw07y*c(bsece of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fyyr/ 0l7i 2dp t hvltj./zh)k9or a total impedance0ltk9.2t l zp7j/r yhvd)hiy/ 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 witho wj1v5r(j xxzk36 j*y a 20-mF capacitor. What is the impedance at 1000 Hz? o1kj 65vrjxw3jx*(yz

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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 q +awl v mo4j5/qj*d mv1)tm5vseries with a 10-mF capacitor at 1.0 kHz for a total qd +vmjt/*vl )1vmw o 5ma45qjimpedance 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 capacit+5pj01g-sk(sd l;car cr h6z oor at 1.0 kHz for a phase +cospj1- dlhg6 (0cra5 ksrz;angle 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 ngkjqeef3 / 54eu-(ajh eeded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 Wq-k/e4f eu5j j3 ega(h?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 qpt:s 8(33jiyxnaf/tg *xk ,mHz. What is the phase angqy8j /it fm n*g(p, xk33xsa:tle?

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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 qgyy) .,xw iv*V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci.gvyi ),xyq* wtor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capa qj :mj4/m b4d rhfls10onhz./citor, and a 0.350-H i/h.1d0ql m fzojsb:h4 rm/j4nnductor. The circuit is 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 capacitive rea rhognrb5 lf+52z94nq9vt ) xcctance 30 W, and an inductor of inductive reactance 30 W are connected in series t5zronlhgr vc59fxn4+) qb9 t2o 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 circuit containkqzlhlr5p .3 )ing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powz pq )5lr.3lhker supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W 1r s5a0fe 7td bke8k7wws+pb1resistor for a phase angle otes8 5k07sbr pa7wek fdw b1+1f $40^{\circ}$ 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, C = 10.0 mF.y.+w92 ,egrdhzwh(qz vtwdbov7 4z/8 At what frequency should the ciz8tw9wqodrw (hd2bh.vg4 7 ze +/, yzvrcuit be driven in order to have maximum power 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 serieu)mcf5: 2jl61 wjjzwm j2wa2ms circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c6w2mwjlacj1:m2 2fjwj5 )zmuapacitive 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 af ncmuao/:7uu+ka*g.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 W and a resistan moxt+g 8t99/t+ljet wce of 30 W. What is the powexl tm/9wtjg+8e9 + totr 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 containing a 50-W resit1; bx5rjq5xl/va p-fstor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hzpatlq xb;1rj5v5f x/- power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in .,ai9fv4r.nu2b:.ndqvj / m dz o k(gmseries? vd(qjb.fu.m.9od2vg, k / a m4:rninz

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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(d9o50ml 0+p cmwbcrm with a 4.7-mF capacitor for a resonant frequency of 10 m0cpdmm5+blo r( c9w0kHz?

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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.)jt remltw,z 246 y-mq7-mH inductor for a resonant frequency of 1000-2e 4lmyq6 )mr t,wzjt 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 w1awog(- eag7d+oa +l yith a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is ty1+7aa l +( goo-dwgaeo be 1000 Hz?

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