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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 oao-)fi6nq; otcp*c*k75rpikf 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 induction states that the g2 ly8y8vp3zm+ r/ugcn1 +b md$emf$ 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 wiregt k g2;,ik4lwm l6:2fez4k pm)ajg)o9x8 dte in a coil produces what kind of change on the in6k )okgg:e ;2ew j8g zp4i2xmdt 4klt a,fm)l9duced $emf$, 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 ofcm g o94vg:1h xsg)q)n the magnetic field through a loop of wire produces what kindgq g oxv) cg4mhn):s19 of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what k d +g:bd)k8.k i zouigog.s9x-ind of change on the indu .8:.is+i9g )u-xzkddgbog ok ced $emf$, 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 magnbz +zq(cwb 1v+etic 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 o h(oy0j(99 p anfjqs 07opg5nuf an induced current in a conductor will be th(q5npjpg oha yns909j0 fuo7(at which tends to produce which 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 horizontalztj9g 7fe5:ajxp , mm3 table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fro:aj gx7e93tm, pz j5mfm 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 tabkt)2wozw: :bkle. A bar magnet is held above its center with its north t)wowbk: :2zkpole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic0rfd, - dxrzu5k *l7vd field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induc f,r *vkx0-uld dz5dr7ed 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 the magnetic f 6zm4u 3 x: f:frw(zgd+h p:-we6bbrdrield vector points straight up. The magnetic fie rw::-rgbwdzh3 rbp6xdfeu6( m4fz+ : ld suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the ma 9-rz of)vl;l38iiqbeff4 ; lignetic field points straight down. The magnetic field disapp-rib3i 8 ;fl4v )f;qze9oillfears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and p 05wy8 xtf s9cim)d8iszl/,ncarries an ever-increasing current northward. Two coils of wire ywp)c /8l 8ixst09idz m5n,sf 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 6 g5w 2i y*adwngaca2,of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fromi5, cg 2ngy*da aa6ww2 above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis mkw*)qu 1e j*twhose direction can be varied. In a region where a uniform magnetic field points straigj *ukwt)* 1eqmht 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 wirnr3w)jw2 c.sjrlt oc43k3b:we is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight s4rwk3r32:o3cjb c lnw .w jt)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.ur/fniloealk79t8z h( (,vy*wb2 y;i
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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 thatsm)r m: st5vu( lr0;ta 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. Thex* tp/)lp5bb2bqjwvdko9*: bwm fd,* $emf$ 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-g0 uj0x)fyuc 5west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning thjxcu5 0 0fuyg)e 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 ,u4p8 rokbsu6az h*b3 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 o 1qc *9syff1lh(wrxvwai:q1u )m70 /e wm8httransforms

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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 revolutions7 da n9d. i amz,gzl nci ls,+a.-+/glfn;mhv6 each second. The frequency of t6h.incdif+zm9 dl +sgnal-a7n; vm,a g.,l z/he $emf$ 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 r,uev*ae0 -+22q3zp bufhbzp ce 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 devic3oq rftn5otc7m), h w/e 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 wn c ff6d 4.ku)d7:fpt5bh 6wjcoil contains more loops than the primary coil then it54wkd c.7u) nfd f bj6f6tpw:h 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 5wtq rho 3,.4cthzgx* the primary coil contains more loops than the secondary coil twh*t, h5gxrc4zt3 qo .hen 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 oqjcf 85n10j bpower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuitjo;(dg 7obs rhrd .fb )ty(1z8,

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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 n:0v cdka9bec5im: pt 1x3js(are connected in series to an ideal battery of constant terminal voltage. At the moment contact is mad:piaxscc v t:(n31 b5kme0j9de 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 ideal battery of consoo(p- c *-xdcnjh-w -utant terminal voltage. At the moment contact io--*-u ohd-n cc(wpjxs 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 witooietc 7nw()3ay -ilh/a 7x4n h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inog+4p 8rtnuy so,qs(* ductance 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- sv dp;.qxqnj o3ql)bp3t39v 1wq1cw series to a battery. The time constant forp s9; d)j-vv1q33xwbcw q3qtnpq1 lo. the circuit 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 b1at;4 ip6yic7.c,vbtsl uo5nattery is suddenly removed from the circuit. The time co c;.bl,uipvns5it76 4a1 yct onstant 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:kqtw) u+ntik.aro9 8 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 ciwb fsi02-a9/ j y5)xx gmjgs1ircuit, 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 sup,x1z, r:egn mxu ,jn5t6te3awply. In this circuit, the currentat 3eu5x,e1w ,zjg6nmrtx :n,

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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 fov5-.. cq3zxbns- aih actor when the frequenc -. avo .iqsn5z3-xbhcy 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 voltage across an inductn i3j8zh zub+,a,vf7mor is doubled, the inductive reactance of that inducto3+f vaiun jhbz8,m7z, r

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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, the 8ybmi6 )51s szlz1tuvinductive reacl1 szv1y8i5 bu6)z tmstance 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 pmg 71n8uwqbn9lq4hzvbz* 6(q ower supply. In this circuit, the current nm(ln*8b g1qq6 94uqwv7hz zb

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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 what factor when the fr1ep hwyr .pa.2g,tb3cf7b og, equency ..t1ph2gabgy3bp 7 , fcoe r,wis tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zerm707u xpkeg )wo, the capacitive reactance of that 0g 7kxup 7)emwcapacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor is a550*t gvzbzn a RLC serzstv ab55g* z0ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is oec39 0 pxl-acdefined 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 ciy( 9- x(xg.d8ja 7e 4p :zriohyvi-)b,frnqlmrcuit increases if R increases. When is this statement true?y ibh98(7: --4mof ylvd,j rxex.g(rpaqn) iz

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increv9zxsi.9 z3 xs7jv v1wases 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 impe ut1,r28 ,dyjp: pmdyzdance 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 in an LRC series cwoukna v .l/37zl)h:gircuit, the resonantov nw k .)g/h37zl:lua 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 m+b7qv y 3s 2e3j+ n-hjmgqmfry4+xs/ 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 yg 4gu++xdj-nkzc ;p.circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rota n;jli93w6vu;u bh) vbting 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 vebw3j9;n6; )uivluh b vctor 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 un;n;cyi o/ gocv0 p0x q1.c4nqliform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and ;q/ 0goq;pncvx l4c ny o0ci1.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.qf6y e2tmz6qqwt8mvc8 swu5/v1 k5r) 10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vwf8cqv2eq)5r/yw z8q 1v t 56msm6u ktector 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 adjxc+weh-)v2 6 n4:rtlc)f9 vfvf xqqm 1ustable 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 coi0)i f(igi odz8w1af 7bl 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 of wire on a square frgwq)d m5k.tv3 qn:7trame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the k.:5 gtq qdv nmtr3)7wfield 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 tz k.2 /xwiwkqzm 98 / q2jldow9ju9ew)urns 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 and /pb24 u. dep/xju7g 1nxmhn 6xarea $0.20 \; m^{2}$ 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 locati;spbjmb7f hdxz.)7.g pz2vhx;eg;6oon where the downward component of the Earth's magnetic field imxbv g;h zezbp)7p j6g df;o2xh;.s .7s $6.0 \times 10^{-5} \; T$. 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 constantaqzjzva a3prxe :8.r f*0)n;k angular velocity of 2.0 rad/s about .rfz*anva )rep;a:kqx38jz0 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 htc .zxpt+w2sp)6l ;jhas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 pak0jgxc*q pi(1zlk5 9. c(cy 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 rpi73 vetzik 0)yl :-vrectangular 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, whei0iy) 3vrl7tv zpk:-at 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 tp()c.c 1s8qoex8 s zynurns 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 Aod5cb9 r ;wvy+C generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the areco+5vd 9 ;ybrwa 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 generatoruh tp31 * 54u:dbsfsz)a zmce8 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. The motoghoq 7pr dj7e nd13)e4r 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 hafvo7yio7jp+h . :*niqve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full shy *7fooi:n.7 vi q+jppeed 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 power supply. Th*+icz ;bc0hgne operating current is 1.0 A. What is the s 0 g;nbch*+zictart-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.z2 r6x kgn444dtgblvg7; 7 rlv0 W is connected to a 24-V power supply. The oplv44xdngtb r g4627g7;lrvz kerating 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 internal resistance 6.0 W is connected to a 24 t3tard6atv xsuc9:-su(g:g2 -V power supply. The operating current is 1.0 A at full speed. What s32s9rd: tv xa tu-u g:6ct(gais 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 volt .lh1hwh 77l*wy wnb:tq7j r)page 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 transfortkh k mkrvr4,(8p;6 ehmer causes 14 A to flow in the secondary. How many tur46rephk hkt( k; rmv8,ns 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 t47qw( (cmcdde-w k.-uvm/)eq h :p v;j;whrsb urns are necessary in a 110-V primary if the 24-V secondary has 107vp.;c)(vqc we db( mhq :e j;-w-hrduskmw4/0 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary co o1whe egp (p8e uloo7mlg05-3il and a 2000-turn secondary coil. If the current in the secondary is 313g u- w gemlleoe7(p8ho05po.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 100%a ind 4 m)p :;z.ce;g0w1tvgd:absho + efficiency, how many ampd1.d;ebn)tmhgop:g 0 zc+:v as4 a w;is 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 10.0 mA. The uim1 j7v :x7mby3zgzud5ypv s8,4fw 2primary coil operates on 120 V. z3bmzjyuds p:g2vf1u7 x57w ,8yim4vWhat 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 wp *6v4rmuxe( on its secondary coil. If 120 V atmpu *vre(x6w4 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 ttot4yhi/qo7-c) .t vo,ew5zturns on its secondary coil. -vc5t,qyo )wiz .4/ot7 tohte 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 3 nh++es-dyp awnf )8ihas 200 turns. If the input cuh s8y+3nia +f)-epdw nrrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a trans brdmz 9wp);-sk .v/xcformer has 100 turns and its secondary has 200 turns. If the input voltage to the p pw)d ;9v/bzc x.r-smkrimary is 100 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 and its 1l2c qsbar:xth b9r2 3secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output hs2rabr: c2l9 xq3bt1of 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 120 V. The voltd3v9 ,t.qtl i.ecx t0g: obfd/age is usually stepped up to 4500 V by a transformet to,.9gvq/ xt.li0fd c3b:edr and transmitted through a power line of total resistance 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 stzcrdh; :63szpv .e ,ptepped up to 4500 V by a transformer :;evhzz r s,p 6c3.ptdand transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6n zkgr9/+jmafens; * 9n v44zn0 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 percent4s ;gn/fvze9r*n an njk m49z+age 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 totala:rahck 0fs, 1 resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer wech,r askf0 :1are 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 lrjk 4vte07ulb3u1 yzh*sp; o6ine 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer withjzp3tsk brou*7y1ev 0u4;lh6 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 ap1u o(z4o2jsdown a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 30oa4o z suj2p(100 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 ise,hhvx9m- b* p to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped u9m x,*-hh bpvep 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 s i fiomb:-k xii0*l.7utored in the coil's mai bik*l m oxifu:0.-i7gnetic 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 resistor and 3m:s / .ix m,:1zypxll/ekfrlan 18-H inductor. What is this circuit's time conszrek 3,1yi:pl fmmx/ / .lxs:ltant?

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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 is s mz1z- g m(27snpp zd+ur6eh,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. What is the pea g k5vd53ju(gfe)jh6 dk current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thevpq50bd .7li 1f:k(yxy;a*x*woqqbi lamp?oba1.7xyp vy( b0ii;5f: wlqkq* x *dq

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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 9d6mc g;-x1tz49boamxo -shv peak current throam6- xs9zbtdo; 4o-xc9mghv1ugh 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 . j*teipg z 64t.rlqr.a 120-V ac power supply. What is the power dissipated in the resisto ttjrr.q6*iel g.p.4zr?

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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 resi 3+q5rgu1bpn y)h;avg stor 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 resisto,g z93nr-z a jhq(z+whay6qg ;r 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 resi hfmhl1+4zic, 9a /ujlstor 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 of0xczrxh2v yw43qg0r + a 1.0-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 2.5-f wnz1 l8mltp3hj( -g0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wilvijtb: :di( 5n jy/v ni9lr7)cl 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 of inductive reactance at 1000x/i 1n7 jn .l;xsymqs2 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 60h phls+2 tla42/ikwv (hgc v5)-mH inductor when 120 V AC at a frequency of 20 kHz is applied to g5lhhv)vc+l p 2/ah wsk2it4(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 souaaw)d p +9w(garce?

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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 capacitw;brlpxwr3ai ; 149n tor 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 reactana9db 34xpcnjrp p:/c: ce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of f-1sx, g2 l ivcjq9 s3lrq3*eh1200 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 0.010-mF capacitor be 1jp p/qj 8-(dp;(iqw vq00 W? q -w j(8dpqi(p/pq;jv

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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 th/gb p6zoye q/2rough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W)pubam2 f h4jv+du0s4 inductive reactance, dupj vu4m0 2)haf+b s4and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coiliyr /bxg8y*t *z x(l /h8btknjv/4rr;, and 1.0-mF 4bnzlr//i k j*vtbhyy (gr8x*8t/ x;rcapacitor 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 1 2cf5yex5 un 2 bg2fj6fcy*ync1htq8 coil, and 1.0-mF capacitor are connected in ser5 6ujben25 f2f cyh y* 8fyxtcq2n11cgies?

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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 conn-q 4.c9fthccf ected in series with a 20-mH inductor, what is the impedan9c4.q h ctff-cce at 1000 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 2o 5teh,nvky+ with a 20-mH inductor, what is the phase angle at 1005+hyk2 ,toven0 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 coil and 1.0-mF capa s;)xiocks7s- citor for a total impedance of 100 W at 1500 H)s-cixs7s; okz?

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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 10zabe85ea07 p p)sus*w 0-W resistor and 15-mH coil to get a total impedance of 110 W at 20 78bsez *wsep)u05aap00 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 450-0jdrbus)*n: q mH inductor at 5000 Hz for a total impedanb dsq: r0*jnu)ce 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 p sj dhsc-ihxt;:91md ;86wvceut in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15svd:8ctd mxhew;sh9ic j ;-610 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 capac m 7gn7,wkhy-0 l/zl5w*tbocqitor. What is the impedbnlwq ,5yz ck*tlw-7/0h mgo7 ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in serf w t 7e3,xttdn26qpb)ies with a 10-mF capacitor at 1.0 kHz for a total impedance te27pqwt)x tn3 df, 6bof 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 kHz for - bwtg*d46rq9o;sg1fujwi+fet5 i c.a phase angle tegibf q41-od w ir +gf;u 59j6tcw*s.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 serieso/ 8b57 m /0gxdu3s,o 1vqhebt 1,cn4utnx iqk with a 30-W resistor at 1.0 kHz for a total impedanc5g oqx ,4x 1bhiemk8otvc b/s1dt 3,un0u7n/qe of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in q 2dbenmfriw2)2sjc:3; nezv8e2;qz series with a 100-mF capacitor at 120 Hz. What is the phase angle:rie2 ;)cj2b2z 2d fzq;e3swvemn8 q n?

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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 hec p4e65 (fyv5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series 4e 6cvf5ehy(p?

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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 capacitorq+ accdwt-1az ; p4z;l, and a 0.350-H in+;d41zt-l cw ;caqpazductor. 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 y :a(-,uwa8s6si deru of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cirsa6u:ay ,w 8(du -rseicuit?

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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 av 1sw0 2ah9xenj/,j0vyh. qkig m2,dg 50-W resistor, a 10-mF capacitor, and a 0.45-H indhmvg vi2kd, y jej.1h0 /2x0 sw,9agqnuctor, 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 necessary in ser(*wc-h-srw9ti71. bcgmy ybg ies with a 500-W resistor for a phase angle of -* m9- bgc yb.y7wcwrhtsgi(1 $40^{\circ}$ 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 W6mn1 m+wa ,no fv(s6id8d) 0vt oouvu4, L = 200-mH, C = 10.0 mF. At what frequency should the c m)1o0nudd, 6+ 4fv o6uv(t8i osvamwnircuit 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 series circuit with 12.0 W resistance, 15.0 s,bbed2sf-:t3 zdu m /y3a sauk*3ng+W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectegbuatkf m:-zu d+*sd3,a2/ by3se 3ns d to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is1yzpg 8knakt dhjxzm6r(9/+ ) $63^{\circ}$. 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 a.8*upp:huaxg *rw4 t dnd a resistance of 30 W. What is the power8*4puw.pr* da:uxght 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 resistor, v:+ lw;vmv8nr a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p ;8vvmvn:+ wrlower 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 capacitozprz 3i *l-z8dr and a 15-mH coil in series?8pd z3*rizzl -

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nsgx 9ox w7b7f2mx2m(aeeded in series with a 4.7-mF capacitor for a resonant frequency of 9bs f2omx72wmx (7ga x10 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 48pukupzaih0j i.g 8bifmnt, . 0 g,-sresonant frequef ppzi khb8 -i0jug8a.g ,0 ,n.4uismtncy 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 with a 30-vick+ wf 8f9a.W resistor and a 40-mH coil if the resonant frequency of the circuit awc.k89ivf f+ is to be 1000 Hz?

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