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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fg ,k;qu1fur392 psj,lh4f,: zxgoemolux 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 thatzjmrmp+yx o*)bc/8h- ; fe :qc 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 wpo j1ir o93oi7bo)/3ccnhf / rire in a coil produces what kind of change on the induced1 in3jr9 o)7 rhficcoo/ob3/p $emf$, 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 throughca v*;+t 3i :woc9 fjkzr0kkx/8fi 7ca a loop of wire produces what kind of change/j*zac73fxcwk ;:9tioc 8i0 rafkkv + 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 kind of change on the inda uok0e fgp.w0dutl/u -3;o-//zyzmiuced u/uemzoufyg./wd/k0;-pz3 0l t- aio $emf$, 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)fe.ufy0l 6t( bhst t/ magnetic 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 induced currenvmhor l k 4gjqrxzl )x8;xaza7d5.g 7:u;m;.ft in a conductor will be that which tends dujm7 .4lzz)8l khrxvf7:qx orxg;.5 ag;a;mto 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 fp3g* ccv2g:k+ q1r ygblat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vi:qg31c2br v yp*kcg+g ewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magn*1n0 u9x(qd5fd ;lbdpo tt/ llet is held above its center with its north pole pointing down,np/lddq0l9tt (o;*1 5 ufdlb x 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 magnetic field13k mfqly+(er vector points straight up. The magyqkl3(+r f1me netic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnecl 2j4kaoppivbv o41i f8-+h6 tic field vector points straight up. The magnetic field suddenl1la-ckhbi 4 jvp2o pvif8o6+4y 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 horizonnu-gs9q4c- s, 7hsv. c,o axzhtal table top in a region where the magnetic field points straight down. The magnetic field dc, su z4-ghhs9asn o7cvx.,-qisappears 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 hk igd*90 a)dwand carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curg0 w )i9dkdha*rent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wi.6ml+gb2vd9rt;sz;s v4 cjuz re with the north pole entering first. As the north pole enters the wire, the induced current will bvc.d stsl6;9 r2vmgbj4+uz;z e (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 sa c p8xtp*pei feua)ctl0o0((5) 5evabout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be a)0(t tep08)5oi fepap c5vclsu*x( e 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 about an axiqh43i y6 h,q 5q6mylhms whose direction can be varied. In a region where a uniform magnetic field points straight down, what muq6, iyqm5 h6hlyh34qmst 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./zn:(fc5gc ;n(dkjy j
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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 thas b siqr e3pch*+/7vm6ek0/ty t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnet-ltk5 jy rl,(q-x -lv k.rb1cieng*)+bn xxv5 ic field. 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 qx sv9d.p;n,0(w brm zzj /-k+iguy;v direction) is moved northward at constant velocity through a ;/u zb (vnz .x;wq ik0vg+mjp ,rs9y-dmagnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar ro/9 w:1cenj o3asxkb ;l kyzip h,l6b+dtx. (.atates 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 trosn/bh qp 0kbixrb(/9/; ji- ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequen p hxw6gx 9**n,iktez d-,ob )2/ymtcjcy of the )tip h/ *e*dx6k-y gb ,jon9zm,xtwc2$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used to ibqj+6w5,kb f8rn*v 8(h micl

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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 deuzd)0uy m pq*:vice 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 sec; lq+b 6dsl58zvb s,kzondary coil contains more loops than the primary coil td,v 8zblzl 5q sbs;+6khen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coi2+g ryz*dwl.jwr6f5lw*w55f;cv*bp p 3e k aml contains more loops than the secondary coil the.d +rr5ew;c 55waf w*2zwyg*p 3 ml6vljbp*fk n 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 inpb(tkvhxe: n t-zqz+1l*dt- 3 sut

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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 hz.z .w 6mf 6vuf/;xhlcircuit,

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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 indxawi)ygr )20kq.ti*g8 regy7 uctor are connected in series to an ideal battery of constant terminal voltag7ti2ki ggxrge y.*8a 0)ry)wqe. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an iovzoz)1010iio ytc1kdeal battery of constant terminal voltage. At the moment contact is made wit0k co zz1o11vtiy0) oih 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 R is connected to an 5y(evv/y mei29wq c1gr7 nfc 7$emf$. 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 inductancej sakw1le( )4l L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time conx7j zskr-hx/ 8stant for the circuit represents the time requis-x/khxr78 j zred 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 batteryzo.jpx +n1m6xc).-ywp le )nk is suddenly removed from the circuit. The time constant for of the circuit reprel m-1ppey.o nc nkxzj.w)x+)6sents 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 units except*1yn;a7uju(6ba ( o:kivv 107dw4 qxsqhvz vw:

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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 thisa/4r )j5ls (ho /lgwxa 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 u*als w7 ki6 p3x:zak(curren3 i7kz* :wsalux6apk(t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactann) 2cq2ssbdk9 ujog ,1m qxrx4b;4 t9y)v*scqce in an ac circuit changes by what factor when the frequency is trip9;b4 ss4bxno rkquycdq*,s m12cxqgvt 9))2jled?

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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 vo h0i jc81zbi(gltage across an inductor is doubled, the inductive reactance of ij0 1czhg (ib8that 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 ( /xze+t h3fcnvoltage across an inductor approaches zero, the inductive reactance of z(cfex+ 3nh/t 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.3jn jjngb28-njfi61 oz k:*tp In this circuit, the currentn*2gt jp:6f jn3z oj-1 ijnbk8

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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 wvfv u -+vq9ei8hat factor when the frequency is triplei9e- v8uvvqf+ d?

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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 acr mi77tc fg ua,f*i;3dv)p 4tmioss a capacitor approaches zero, the capacitive r a vfitcdgmp; 3itum*7,4fi)7eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a wz bz2h:* 5nj9kf9 oif(h+ryv)4 agnp RLC series cir99inn)vh2 :ojg5y(f4+pzb h k f wa*zrcuit?

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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 defl6 mc8kz /jc-w0a jolbhy.r 16ined 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 impg honiae1n60 r6 .hwxje8g s++edance of the circuit increases if R increases. W6wg1.xr+g e0ohih8sa e6nj n+hen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasy2yz: cvsjy :mer k :8rl.a5+ces 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 , e:+.e xsb 8invdt8(l(kpnh.req g1a 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 d+c4dfw-km 3 brouble in an LRC series circuit, the resonant frequency ofc3 bf-+4r mwkd 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 vo4)vf0odn v2 thltage. 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 cir/ 3t owrjm9j:th(.u4 zqfcxs0 l:fgu7cuit 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 0.1u.drt y/p,njn tk)k+br 2 s/+f0 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 nk)np,k. /2yst t r/ jdr+bu+fand 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 rotatin,al.vgx)pfdh(gkd5 2 g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector (.hk advglx5,f2)p g dare 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 fcd81) / ukurjeield of 0.20 T. Find the magnetic flux through thek)uj 1e rcd8/u loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single il(. zku .zho; jh,sv9loop 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 c45i+ zln0p uo2 zm/git9yl lp,hanges 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 wi) ezndn5) -ir8j8myqr mfk2u ;iem)b-th 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in kqemm u )z)rfjm drn82eb- 5)8ii-n y;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 arew 0m5ppd9r2; )panwa ia 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 xjc)k 57nlak ja w/*+fand 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 atn, rcpojj +7)v a location where the downward component of the Earth's magnetic)cv,r o+j n7pj field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angu3* hlct .mq:6 -jtckw yz2zl)vlar velocity of 2.0 rad/s cyzql j-c.)lv tk3*2w6tzm h: 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-sec-( (xbszz qv8xtional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar (pxv1bo)imyhpvvh5,yg) *. aea $0.090 \; m^{2}$ 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. E)imh:7(geu e n,uke h0ach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm aboutume ,0): hhiue7ge(kn an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consivazoto s968hsz/s( j s)t*rr+sts 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 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 generato((sm4ex4qq 7mt hy6 *+x18 dkydzymzmr with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T isx7q (4y*my1+4 qxmsmtke 8zdz6 my (hd 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 gew h,uym i;-vn.nerator 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. jcfnlpo9 e.39x5fp0b 00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Thqo m6ol m5gol-2sq ( (dffrhodk1)89de motor operates on 120 V AC, and when running at full speed it generates a back (2r h9(ofm 5 q)- do8kd1sdf6ollgoq m$emf$ 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 co)/k. t n ndpruz:mfgp1+ pb.j.nnected to a 24-V power supply. The operating current is 1.0 A. )bmkpnpr .pzgufn.. j+:/1td What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppak(l9i8b iy/e:r1u6e i9it 6nv y 8mialy. The operating current is 1.0 A at full speed. Whii9y k :86i/er e iu1l(8n9b maavyi6tat 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 internafow q,k* -+k11qur5kl3 dnahp l resistance 6.0 W is connected to a 24-V power supply. The operatin rkfl5k*+p u-dq1q1aow h kn,3g current is 1.0 A at 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 a pri haer.zq8 whc;vxq 7r6-ga7c0mary 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 p6n qw;qpv *5 vc+jw:hl6ip :q14 A to flow in the secondary. How many turns are ilqw5:j+p :vvq* 6h 6w;n qpcpin 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 man(r j troox*/5,zh term2my;s +y turns are necessary in a 110-V primary if the 24-V secondary has 2mthr +*txoms/5er,j;o( zry 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-turn primary coil and a 200fo)a 2 ;r3razzjd (p)v0-turn secondary coil. If the cuzzovar;)f2 3 a pdrj)(rrent 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 the primarol zfk7 86vz+qy of a transformer. Assuming 100% efficiency, how many amps at 24 V can f7q v+8zf 6lozklow 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 2 pl:6;wc6zze rss c+q7500 V at 10.0 mA. The primary coil operates on 120 V. What doesl+sz 6cpc e6rs;zw:q2 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 turnsizha+ mm+b0q * on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0bmi*z qh+a+0 m 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 * ib0oho, gqik )uha19coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cugokoi1a90 ui,)hh *qb rrent 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 an d0k0kq+s7ssn d its secondary has 200 turns. If the input current at the primary is 1q+s 0 ssdkn0k700 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 its secskx02ezw4 deiv +dqbqqa6t tz7,* 3f*ondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the*+7 3i*z0kbd2sa64z ft vtwqde xq,qe 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 secondare;qb1( s9 qzbey has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary 1(qbbe9 ;sqezto 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 voltage is usualbf,29.tqv pxl ly stepped up to 4500 V by a trx9 f .tb2plqv,ansformer 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 iskcqmw ,vr,9.x -g66 fbvjt8 qb usually stepped up 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 transmis8,. fvmwjqrb,cbt96vq g kx- 6sion 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 atrejv8bl /nl8xvm h4d8:4e k0gd o1 jq; 120 V. The voltage is usually stepped up to 4508vb:8 lqoj10 ;exkhjgdr4 len/4d8 mv0 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gf7 voi+i 31ahqde9qo- enerator 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 td 3oaq9q fv1i-+o7ie hransformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long bzaisyd 8o+6h 81ph69u 9ajeg 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 wi1i98y6 6adhs9zhpe goju b8+ath 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 4m w*ad .6pzykV. How much less power would be lost id m.ya4w6kz p*f the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It fo3.j5nv 2eixx: 8 anwufi(iht6 (l9o is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppedt6 8i5 ffonnxh3 luj (2viow(x.ai :9e up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. Hows gqjv07wlc;9 much energy is stored in the coil's m q9cj vsw7g0l;agnetic 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 an 18-H inductor. Wha7)jg4:gy-ypqo dwsp9p+ lsz9p ;c .mht is this circuit's time lp:oyw+zcdyjpp 9hpgq.4 s9m)7gs ;-constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volt16:u dq.ut bygage 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 outlwpmt+kod :.ds*/ js3let. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is )-cjus jz 8ue2the resistance of the lauujz-2)e8cs j mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V fj 8 *w:b.cnruac power supply. What is the peak current through the resisjrc: wbf8*n. utor?

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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 coh .8jo; w;v f+ -l8vyszzq3qrvnnected to a 120-V ac power supply. What is the power dissipated+sqhyzo-qf8.rvw3;v8j lv ;z in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ;qv ;ua6 n0)-o e;xryv*dsj+fgs+c h yis $I = 0.80 \sin (240 t)$. 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 resiztndct;q. 6v43m 8sh6 lah44 nk ( ;ahjqc,fmjstor 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 wn5(yz6y cnn3h e7sa9resistor 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 a1svu 7mbr(hg (t 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1o369gg m.iela 000 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 14.0 W oft+9e1v+cijzchui -;- d vg,sh 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 necessar 4b3js qf2n e;ncx0v.ty for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120d0mb mnq1u +n0 V AC at a frequency of 20 kHz ismnbqndmu10+ 0 applied 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-;tfbde*.ek o n4w etdpw0d 7-;mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 106 yf s4 zc 3:zv-ovg-su)jt.cu 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 reactancewk i :j (zha208io i*osdo8qz0 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 on ejcsr..qn* u/c4 bex)2i)kff 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capax-j1fd0q).yqidw/ jvh ;1myi citor be 100 W1jy)v0qdiim/- qhwy fx;1. dj ?

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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 a.p001;ifhkfrzs il(oj v3 8yjnd 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.-(lujb,l o bu1 qma,e.0 W resistance, 15.0 W inductive reactance, and 10.0 Webj.u,1a luqo, (l -mb 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 1500u v/f57s9, qp(,exsyi n9jzd a Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?/sey,,d9vus(pqnfja9 izx5 7

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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-co h9/do f-aw/W resistor, 20-mH coil, and 1.0-mF capacitor are connecte/a oco /-whd9fd 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 cowtz (hj z6wbjjp6 q39 gd:j97onnected in series with a 20-mH inductor, what is the impedanc69( g bpqzhj jwjj93t z:o7dw6e 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 with a 20-mH inductor, what is the)uzh9t 4yd* ty phase angle9h zyut4 yd*t) 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 nee ;a4kk1,g +gaygdxjs3 ded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzkayk4gads3g1g+jx ;, ?

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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 resistok6l5e 6par. pgr and 15-p k6lgre5 6pa.mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a to18t)4cjwv i hztal impeh vjcz wti)841dance 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 f 27p h60.ypkwmmm2lae-1tozseries with a 100-kW resistor at 1.0-MHz for a to ke.zm6 7012pflpym wha-2otmtal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impek8kb 2+0q ytdzdance z ktky 2b8dq0+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 series with a 10-mF capfyemyay 1 p 16pe/zb)*acitor at 1.0 kHz for a total i 6 pya/ezp)ey 1b1*ymfmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1mnvmj d0-v9h (qjv8pmmxw3r b6o a+ +v0b8r4b.0 kHz for a phase0rvb6mm j3 q0+v(ph8vxbm 8j-4rnm 9awvb o+d 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 needed in series with a 30-W resistor at 1.0 kHz for a+qra/cv6xs eirw(qx 3n+f6 n;3o,n uc total icni nvfu/q;n3(wxqr,c 6 3+resx+6ao mpedance 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 serie crh:/yeuf6h,;6hy me4 a:t(x2hwjs ss with a 100-mF capacitor at 120 Hz. What is the phase anac x hys, terw6y hhfm:u(/ jshe462:;gle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1: .v6o stkbds7.0-mF capacitor:dv7t k6obs .s 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 capacitdkxc-j)z m1:hkzv z(c 6ch77zor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply ()6kc kh7mc1dzhzxz -cj:z7v. 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 reao1(uqlr7, 9urfvi-fya .cq(bctance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powa9iluv .qf y1b, 7(f-c(oqr urer 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 containing pxwjeo993+ vs a 50-W resistor, a 10-mF capacitoo j39v s9pew+xr, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series wb +try0zeyx 3 p-k3s)kith a 500-W resistor for a phase angle ofyrsb-pktk+ ze033)yx $40^{\circ}$ 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,hjqh ,7id/-j6r grg6w d4w)cyw: (okc C = 10.0 mF. At what frequency should the circuit jih- 7d)gc/yh 6wk:rg, jdrcw6o4wq( 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 output0 y 2lyiubsny6xd 420d.slu 4mcwhd1, in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when xcdby 0 u4n,lhiy ms.uwdld6412 y2s0the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci4fa6)g cc6uf up kf54va t,om:rcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance onkbx6+jv mns ,-4ec o1xtytg9*1mp8 of 30 W. What is the powe+yg*8 tv s-4x1 op1o6xkj m9btnmn e,cr 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 cozcl9 r4oej i8:ntaining a 50-W resistor, a 10-mF capacitor, and a rl84coi9:zj e0.45-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 freqo / 8qpexrf:ru xfg .mz)o1, +u6vcxjc6k7i3q uency of a 1.0-mF capacitor and a 15-mH coil in series?fuex6,.fom 8:xpqzr jr63 xu1i 7kogq)+ccv/

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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 serie17x lnl3n(u4kq g6h/.hch umo s with a 4.7-mF capacitor for a resonant frequency og mh x6 (o/nluhu4h7 3k.qn1lcf 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 inductora1n, :nr gqjn5pj+i(dnx bw/ )g59 ckn for a resonant frequency of 100i g:g+bacnnj/knwr(d59 1 nqn ),p5 xj0 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 awr n(0ai 24zsc ynu48znd a 40-mH coil if the resonant frequency of the cir8izuy 4s4rwnzc0a n2 (cuit is to be 1000 Hz?

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