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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 o tfzbp,8--zt tf 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 d: +gj31,syrwx, kai/x jpjv+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 loops of wire in a coil produ-hp.1pdb x;py0xrry72 3) umzz ccdp;ces what kind of change on the indu- . cdzzh1m;ypycrr3 p7 2 px;0ux)pbdced $emf$, 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 wir uw iffpu,b5bro(wih: 08a c;0e produces what kind of change on the inducedfa(5i08c:r;ifubwobw ph ,0 u $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind 2 d uyv xrugac9 ic1493vi,)neof change on the induc,cyae9i c2vxd9u4ir vu31g)ned $emf$, 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 magneti/tbek qwj) 59ec 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 induce dg:0vxwbz) lpvd-:i 5d current in a conductor will be that which tends to produce which of thexz)ipw0gvd:bdlv :-5 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 is hek m 21xh6avgel7pe,t,ld above its center with its norglev 7,a2xh 6m p1te,kth 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 o*at.6vitn5 orn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As *ati tn5rv.6 oit 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 magnetic fhi4 ypkqsp wo(-1p7 e8ield vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sye- h wkq784 soppi(1pense 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 the magnetic fielkuq/35xr 7 flld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as thukqf3 x7r/ 5lle 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 k ep1g k) 8cxwlkdm)z;r: 1,hmvlr;8 wa region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction11exlrkhrw, gp;v:;wkcm 88lzk)md ) 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 aay8cxdw4 -nh:2f5lw0d : s;c3bexp6lnzxia5 nd carries an ever-increasing current nort;c 5 plb h:fxa8lwn623w5za4y cs :xex n-di0dhward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through av qmv f oiqq/i.8:xkq--p8 a:z loop of wire with the north pole entering first. As the north pole v.-io:ima :q8qxp-8qqzf/ vk enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular sp,h sapf *z0ig6ebm52geed about an axis whose direction can be varied. In a region where a uniform magnetic field points sge hzbp5gs 26m0a,fi*traight 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 speed abr8sq xb,+v u 1 5bbj68cwxra7yout an axis whose direction can b8uvc , b65aj bs1q+xb7yw8xrre 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 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.e+(t gz) 2hdwld(1g rz6blea 5
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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 v mx+ u)y(a5hiub2:z4mq2*l*cs j fqnthat 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 fi;hj0ll +zs y/peld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction nw:9t4o-zqhb ) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentizbnq4:- wt9o hal 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 angularhins6 ko k;j:tw;wb(fwq97 m+ 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-p-d 6kvntqlypm1 9v4 transforms

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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 seconi*aj o (u5gl+6ept ;u2zokk2g d. The frequency of the g2a 5lt+6g e*pkuoji k;ou2(z $emf$ 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 de;j d xdc8u)4qyvice 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 deviw2jmd8ig .v cql4+ g+wce 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 loops than t q7xv2 v;qsr:ohe primary coil then it 2q;v7:x qosv ris a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains mo6q0z2 u. )bkufju vf4ere loops than the secondary coil thenu .q b0e6fvjf4u2kuz) 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 i55bn6fw( vah snput

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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 circun8;del. q-vd tn-+pliit,

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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 9fx4r jlg-yp7connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, t4fxr- j7l py9ghe 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 serigggkk/y4:-5trn od7 m1eoh p 1es to an ideal battery of constant termg gey -o1hgm47n /op 5r1:tkdkinal voltage. 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 resisv21ewpcc r*e + h3vh)ktance 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 wi8: ;.z7tdnqkirgw qv7 th 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 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 bat,26;e ug0ob i6uow iavs4u0 jktery. The time constant for the circuit represents the time required fo egs 0o66;u2iu0jv, b wi4aukor 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 to6ck 3 qmq)*9bl7/j erumdk 1wtx( b4ki a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for th ik)*tmk b3xbm917 64(eqkdcu/j r lwqe 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 sam yzejvdg-. x6w(92uud e 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 7 l-4vzt-r2ifxh*k ijsupply. 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 connecte/ar.weetbv6 uvx,kul1 * /0cxd to an AC power supply. In this circuit, the curren0/ukw/u l bx.x,6 vt*1carveet

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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 theh gb4q058p;,nno scnqdmz 3s ; frequency is 0mpc;3ngzo5n;qd8 shqb,4ns tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductiveon3ghqwe * wnd**1h 7ozyd; :u reactance of t3n1z dwhe7o*;qyg**u:dnh owhat 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, the indu/i l4zrm) ,lpw .e4nfoctive reactance ofefl4 m4. ,r)inlow/pz 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 po8 sad;.fz9t+m48l nm xd:+tej0ird b mwer supply. In this circuit, the currentzm8r:b4jt;t 9+ 8.id +dsf a e0nmxlmd

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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 whes 7t14azk.nf ln the frequency is triplatk.n f7s4 1zled?

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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 bf bs9--rbg3 avoltage across a capacitor approaches zero, the capacitive reactance of thab-r3 bfasg9-b t 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 be,5c u ro.,4(vi oxmjyztween the voltages of the inductor and capacitor in a Rrv 5.u,x,c 4(oo yizmjLC 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 6-lad9d*jmyz5;xk . mr pa/eq circuit 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 impedancct 7 (4htx7tc ex0)axy, qn*dke of the circuit increases if R increases. When is this statement true? 7xdh0 k7,tq c(ea 4tyxnx*t)c

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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 impedanckvu *i t1qlf; fu8ml0-e of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the 2;wv9py isgav mi(r +gx-8l s)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 f2bvks k4p(9 aan LRC series circuit, the resonant frequen s2p4( kavf9bkcy 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 applied voltage. At resonancg0g+n .gjo )xye,

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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 circu/53,sc6yb*lh ot dtw5ms f 2btit 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 rotating 3euevla ;4.kq in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when . qeu4;velak 3the 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 (*kftpc3.6xp+rmjacv qt h -8 a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planehrp* qkv mfa.-(t+jcpx 8ct63 of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn4dp1/8zl bson etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the ndzl 4bo18/p sloop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singlrr0v4h9/ o 5 jxnmki0xe 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 changes fro)8h jni5.5axz hxqum(m $4.0 \times 10^{-5} \; Wb$ 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 /sycq +g;nlj8 of wire on a square frame with sides 18 cm. A uniform magnetic field is apq 8lc;g+n j/ysplied 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 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 otq hn7m,m f(-glc ,n,vf $0.40 \; m^{2}$ 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 arl od.w 2.go1xl:cjk 3wea $0.20 \; m^{2}$ 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 f s 0usait jn+r(unz5(6lies horizontally at a location where the downward component of the Earth's magnetic field is(r0zia snun 56t+ ju(s $6.0 \times 10^{-5} \; T$. 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 at0fng8e.zt3+8:qs-o qn ro lsf a constant angular velocity of 2.0 rad/sl+ s8sq :fonegt- r8fo3zn q0. 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 has 50 loops and a cross-sectio 4lw 9mntj6j .tllkd(+f s,4qcdv ot,0nal 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 tur99 s 1 u9kt(vs)bztrl*z:qxi hns 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 looyi3zrgvpi*p ,j35k4 y6krf6 mp 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, whiczyp5ii 6v gyf3kjk3p4m r6*r,h 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 2sedfy/z .wbvj/)w;su kp d6vlm +, *w100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of hd(h lqw,- z.j12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the are-hq(jwdz.,l h a 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 wiv 7 ,oh(xmwr4tth 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 motor operate:e52.dywtyo8y l y+j fs on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motoru+ c ai-ya(8qf operates on 120 V AC, and when running at full speed it q( a+8yia cuf-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 c+u*, gkg)cq;ndl6c pvonnected to a 24-V power supply. The operatiqg n*)kpgl;cdv u+c ,6ng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-+34 z(b i j6ex5pk*jc iy9)yksfx6kesV power supply. The operating current is 1. 9(ek5 xk zbiy6c )e63y4sipj ksxfj*+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 con 3;-f ;bqr)ao m5h tj+hkeo7bnnected to a 24-V power supply. The operating current is 1.0 A ata ;mrob7kte;fh+ -o5b3)jnqh full speed. 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 needed to reduce; 6tl4kd*p.cvcqcz* p 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 prima 0ei6 f-dr-wgary of a transformer causes 14 A to flow in the secondary. How many turns are inidg0 arw- e6f- 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 2 nn 4t-bse2/wo4-V secondary has 1002o-e b/n4st wn turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cn m aiw2x73vv.oiln 3a2vv.m7w ix. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in m vnk0xnx; bpr yv z.7p3tg7 j(7ktv+7the primary of a transformer. Assuming 100% efficiency, how many ampvv. +ppxmn7yt3kv7 g7j0r 7n; tzkxb( s 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 provcqy4lz z r2-/aides 7500 V at 10.0 mA. The primary coiaz/cr z- y42qll operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary 0(- eb1me8vde zrtda17a0 axbcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what volta1dad7e-a8m(b bezexv a 0t01rge 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 wb1u/ao+trr( and 300 turns on its secondarru1 at/ro(w b+y coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 t pbpb8+qo6ud+urns and its secondary has 200 turns. If the input current at the primary is 1+b 8opbu+ dp6q00 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 iw(hopto) t 1/gts secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the s/ hwto(p1 tog)econdary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary uxt7 m09qg o4ghas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondm7o 9x t0gq4guary 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 0s: xlr/v5go(0huzww*; gj cgvoltage is usually stepped up to 4500 V by a transformer and transmitted through a powerzcsg50lx*vjgw:wug;/o ( r0h 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 ofr.b q4cah7l5wtmfs tr9t 5, l( current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmith,4tfwq( .7a ltb5lrrms95ctted 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 60 A of current at /55c2j vawm hne6thj4 120 V. The voltage is usually stepped up to 4500 V by a transformer5j 5m4/ w62jaecvhhnt and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0v,; dixagp5 8y.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 woul;ag vp8di xy5,d be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance off lyw u;eh2e -,mhbt03 0.60 W. A generator produces 100 V at 7,t-mu2 wyb;h ee3l0fh0 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powe.*spxoi bvv7 e+hbw 44r would be lost if the power were transmitted at 3000 V inst4*4ibhop.v 7bvx+s w eead 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 an .qa0g:ybq-lxzt5t) t 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the lz)gna-5tq:y .0bx qtgenerator 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 currenjbkq+ f gl3anvng.t7;a7q d;7t of 5.0 A. How much energy is stored in the coil's magnetic lfa;gngjta7+;bvk q.37 qdn7 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 cok+6x e+l dc;vrntains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constante6+r;cx k dvl+?

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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 rmh;jz wzz,po*(s 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 i /gn3 dyox)q2wzuvj3: nto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V Agb 9nzdu/2s x ; pt-6bj)*c9ucval qd.C outlet. What is the resistance of the lamcsx.b9 d/q)2 u6zndlu9v ba- cjtgp*;p?

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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 supplyzydd e:0aka8.g ;c4apflc81 bcdd q ;.. What is the peak current through the resistor?zd0ad4.lf cg:;. a ccp;188qda ydkbe

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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 suppl3q;.tp d b,mevy. What is the power dissipated in the re mbp;qtde v.3,sistor?

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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 resistormv pym e(u rw7(dctpbl7:0uy;c-y 3 e7s xa+g/ 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 resistorul* 3 v4bxlwd3,(okg v*ul qe. 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 re-2ib f.jgf.f xsistor 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 if m7on ;mrmi9ee0). thnductor 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 ano; m5gy,:kf* 4du g9tk0q ror 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 1g7t ae1- xviqzgn*8-o4.0 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 indu 3(vyhlar1ek)ctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHq;ui(q vkb2/*s9zi h fz is applied tohi(bq f*vk;/2zsq iu 9 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 1w44bia te 8yo6ou s9;p10-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.z,rp6.nab byve : y+f 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 reactan.1 ddb7gmplk2ce 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 c,t5 3nca;qhqdzb8(tsp (qd1 uapacitor 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 reactatm ;2ks d ,uvo q*ti;5h(pxf/pu,4yr gnce of a 0.010-mF capacitor be 100 W? ,u qu*pm;s, vp(gfty d;42xhi5r /otk

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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 :rzwan* v03bq-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 resistayx20l y6,af0n8up0eca j*k dvnce, 15.0 W inductive reactance, and 10.0xnla j802 fp0,y*d6k0 cyea vu 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 coil, andbkss0l u8,i /eny;6 6k,wgggl 1.0-mF capacitor are connected in seri6byn lgk,wsu,k 0g/ ;s86gleies?

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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 angfhlp bz.3), sm0 k h6a5o5suydle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected5s l ob.a)uz6fp5hd ,kyh 3sm0 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 wit vx,0;upf1 e6 c pyp*nwpg v)g9rux/8zh a 20-mH inductor, what is the impedance at 1000 Hz?* 8p61wzupg pegvxpu0 )r/cvx,f; 9yn

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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, whacrgtnxs+)5 r 7 ms:c-yt is the phasegx7 stry:-cm+rn)5cs 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 coil and 1.0-ri/;-wd/g 2qqqt c3e elih0k *mF capacitor for a total impedance of hgdqec3tk/ /iq*0- lqw;ei2r100 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 resis(ax yax53 lec3tor andya3(xlax5 3ec 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must1r* li:ej3eyaw /z ss: be put in series with a 450-mH inductor at 5000 Hz for a total impedanc*ey3/lj1ai:e s wr:sz e 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 r 147;inpmmmh/suq 2qseries with a 100-kW resistor at 1.0-MHz for a total imp7rn pimhum 1;q2q m4s/edance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What isw)zn pot 9qd,/ the impedance at 1000 H)pnzd q,w/9t oz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor ay z3,1je s5 nbx :l+his csi(o6;lzw9xt 1.0 kHz for a total impedan5xl9b3le yx6 soih+ ( :icn zzj1sw,;sce 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 b uwjbmd8 /)z7dwhb *tko8a3 )with a 10-mF capacitor at 1.0 kHz for a phase ana87o )whbm j*w8d3/)bu zt dbkgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a q+30ma1 2k i :)xh1ucbmnw pgmtotal impedancehc31wm):g2m0 p 1bk m+qaunxi of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is t:md.s :xho -eqhe phase angle s:.he:oxmqd-?

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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 tb+i7f5os0 d- cw72 g/g1wv miareif3V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co7 biseifg2 d0w+5rfow1i7- vagc 3tm/nnected 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 consistg7 iac sz0iroby7*.ncy v70)ls of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cuyr0oca zi*y7gcib.7l7ns) v0 rrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, ahftg0wr v-nl 1(oxr*+a 8qu:.b qsvf( capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hzx-0(vr8aqlf f s*b:thrn(. gu+o wq 1v 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 Rs/xm4b /. zsocLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po 4.xcob/mz/ss wer 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 series5knv ( )kjw x3yu54)dyp 9oxmc with a 500-W resistor for a phase angle of y 4v(o 3x ku)5kjpwy9d)n cxm5$40^{\circ}$ 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. At what frequencyw2wmuvhtfj8 j. 1a*tsnm0o 5( should the circuit be driven in order to have maximum power transferred from the driving jt u5tmshm21*wfv( 8n0w.o ajsource?

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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 r/ nmv+msj,e1 lfg0(sn wcxb k1b9o a84esistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is c bcn+4m (/sfloa wvs kx1gem,j9n 1b80onnected 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 ci6 biu(n c;7br9o1(ogxgj rum 8rcuit 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 mfv5lt4).ads7pe3do u l6af- of 60 W and a resistance of 30 W. What is the powe msu 5e)flofdavd-7p.t a34 6lr 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 serf5abk2gbvy f37g k51 ries RLC circuit containing a 50-W resistor, a 10-mF capaca35fkkfy2b 1 75vrbggitor, and a 0.45-H inductor, 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 hmlh0biu l bva7-3m58 frequency of a 1.0-mF capacitor and a 15-mH coil in series?-h 7 m80lli3h5babvmu

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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.p-;wb8qn;jlpe p-4fa 7-mF capacitor for a resonant frequency oj lp--; pf;weqpa 8n4bf 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 freque: l9hgyeh,+. mqosw: wtzw .0en ,sl9w h:eq.yzto+0em w.h: gwcy 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-W resistor and a 4au oei8p8. 9 3ltvfa6d0-mH coil if the resonantov6eita3. l88dfp9a u frequency of the circuit is to be 1000 Hz?

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