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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux except gl2swj3eru)up6rd3k8j/l c,

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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 twlw m0yx/go8 ucg0/x*he $emf$ 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 pqs )60n,mj;tskkoxb + roduces what kind of change on the b+k)qon6j xs t0m;ks,induced $emf$, 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 tha3x e) d,rlog.e magnetic field through a loop of wire produces what kind of change on the inducedoxdragel.)3 , $emf$, 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 produ60 xuc+x4s(i ae. xj0e*fp wx wq:wo/vces what kind of change on the inducedw0( vqf o:xpx/c +xeeiw. sjwa6ux 40* $emf$, 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,jxs+rne5*: 2 xf3kn1rbsgi r from a 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 current in a conkq o 2jjrreq8m0q;v4:ductor will be that which tends to produce whmq j; o:rr4q8evq k20jich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovem(83yohn z14 an3qkbl its center with its north pole pointing down. The stationary nyo1 bnza3h48l3 qkm(magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on ak7. uqj vg3c vvh nv9*q4 8qvt,n9lm;b horizontal table. A bar magnet is held above its center with its north pole po 394lvtqvvbgn;*nvjmqc8 ,uhv7 q .9kinting 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 where6u+de,ldwt p)z ii i,6 the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense oe+6ipldz t6ui ),wd ,if 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 regi tu xr.1e:u4u* so+anzon where the magnetic field 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 the field increases?+1:uz.n t xur 4es*aou

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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 magnetiresg1fuv 06e4d gqn (6k1 (ey :r-xpowc field points straight down. The magnetic field d1rw(o e 4rgqnyf d6k1 6gxvu(s-e0:episappears 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 carries an ever-increasing c .xuzifn oq74 lr 6quq+dh:(:yurrent norqf 6qd :yho iz.4nrxu:l+u(7q thward. 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 a loopaj4;,bzp ,y )imxjxs ab:/m n0 of wire with the north pole entering first. As the north pole enters the wire,y:/ nmxj saaj;) zx0pbi,4,bm 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 speed about an axis 6 e2jp vs,bbv3whose direction can be varied. In a region where a uniform magnetic field points strab2ev bp6 vsj3,ight 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 a i.h04x ; a metp9-:s1x- zxcl2difchobout an axis whose direction can be varied. In a region where a uniform magnetic field poi2 x-x .:e ccax9fh-1mhizil0do 4st;pnts 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.d y x.zgt93wntq h-:e,
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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 t-0pi(je;w 35cga ciwmhat 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 fiel3sn.fk(j:xt m d. 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 0(6mmgzmz*t er 42tvp ogr ,u/the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement /g v mpo6uzmz r,4r*ge(0 mt2tconcerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocry4h qk(emo9yhjlh u p1-w. /5ity $\omega$ 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 tran3 c3lk4r 6ueu2 cdofv,sforms

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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. f7uwl mw9k;r.eb3;*p;*c+ u*fp a lf x/iuzkrThe frequency of the fmwf*kzeu*xp ;r rl;bi.w/a*kc;7up+ 9flu3 $emf$ 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 o2s rezzv* 4rpn*0vt2to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device 8 y91o1 5,vigawj cerzthat

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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 seconm42z) enoo;r z0 ulm:h*gfp, vdary coil contains more loops than the primary coil thenzezo4molg0 ,:*uh2vpm rn;f) 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 coil ced7p if,. 00b 62xr:np;ddof9e krdtpontains more loops than the secondary coil then it i d.p fd07e6o ,n :;b0fx9 2ertpdkipdrs 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 in9:ut2siqjo10q n5dp hput

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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 circuit, k 3hzswz0.mbky+ds;skgl2) 7

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery oacr m*kq+ p0ng/ghm3) lmbc 17;ugiz1f constant terminal va;p mruh cn)71/m*zmckqgig130b+ gl oltage. 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 cofp4awal68t,ph yhsivq tpq-9 y), 7x1nnected in series to an ideal battery of constant terminal voltage. At t ipspf48t16htpy9l ,wh-7,a) v xyqaqhe moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an owfbo7324 vts$emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista 3ztr:2 tm n92vbln. i*)mihltnce 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(9 z0nqs91(z u;iquor1r tcvz battery. The time constant for the ciz9zu qz1 rvo u c09s;q(nrt1(ircuit 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 battxt ;9mqfa3z)mery is suddenly removedm )tm;fx9a q3z from the circuit. The time constant 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 followingt qz:llz(j9;j have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to awz6d;z +zeo *u0d+o.pwz o6r6 ;lg ysyn AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected -h)n9+rljbnu. 4 kmfn to an AC power supply. In this circuit, the curren+nk4 jh l )9nbmrn-.fut

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequena i zjv,7 q,c d2)ttghvgn2j-4cy a7n4v-)d,q2ztjghv2gi cj, tis 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 voltagp(og j m1a6 )f)3 ohcv;cw7jixe across an inductor is doubled, the inductive reactance of that inductor joo)ag6 m;phf7(cv)wcij x31

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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, thp330kvb/3cg-d hf w qwe inductiv dhb/wf0cgp 3v3q 3-wke reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thedv alt2*y0nm86fz75; z ihd fp curren6 zffha57n zl d y*v2dpi0t;m8t

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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 facpy0jlmk3-h 7n (+n1,p sqlrwgtor when the frequency is triplej7nr 1-mwl3+g0s qyhpp,nlk(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 across a capacitor appr1-*x8u g 76l pnj/lag)ntz,iei tbls0oaches zero, the capacitive reactance of that c enlpt8n i lt -z*gg7ls/i6ubx ,0aj1)apacitor

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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 in1hg(j1ua dc/s:r e e1y a RLC series circuituda1 j yr1hgs :1(e/ec?

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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 kuef+ q1j..i3hjbbz- an RLC 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 circui1nbhu0,3 alk. o1)nsd) p,q t wetxj yu/m3vb2t. The impedance of the circuit increases if R increases. When is w/0n vkpj))uem h by11tl .uaonbqxtsd 23,3,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 imvtl(x0l q d6(a8t 4oscpedance 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*cji) yi ceh4: en3w*y circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance botccu- ms9b;-5q couhv67k-eecl 2hak4 h double in an LRC series circuit, the resonant freqkcuuo9-b4cvm;2h h6 e cq-sle a-c75kuency 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 thax k f6k-l:-.2jjyjb u 4ifj0zyt 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 circuit g70q.h.xo qgzt+67 m wvo bhd,hb:zf,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 in a uniform magnetic field tq/r hlx at)pmn*stjb00;; 3lof 0.20 T. Find the magnetic flux through the loop when the txmljht;q l; 0*/0 )bsnpar3t plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fux6d spx/:o /vxn(7bp ield of 0.20 T. Find the magnetic flux through the loop whpvs /uoxp6/xnd:b(7 x en the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0 uxs,y4v by4l /cb/+xxrf7*em.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 fieyx/lfmxrb74xs/4ueb *+ cv y,ld 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 auamx(0 + vz.zcdjustable 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 coil chaio)1+e 5qo hijonk 8 t7l7oqr6nges 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 oe06 3 k txgyul3 :sr.em:t1cbvf wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average vambr1v3x k e t6t.g:: cl0ysue3lue 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 y1 9-el xst(tq+dmzxwd;/w w +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 a verp)tp*g:p, rea $0.20 \; m^{2}$ 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 a:6qa 89mva-o l9 36q lsg fn7y.vdtjgst a location where the dow3mgv q9-q6gsvfs68la:jy.dol a7n 9t nward component of the Earth's magnetic 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 angular velocity phaakagbk3e 2v9,kn6 l 5;fo: of 2.0 rad/s about a vertical axis through one of its ends while in a constant kva k 9:a2a3b fpn6ohl5ge, k;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 lj i4cgd - 9us5.hy2ovkoops 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 turns of wma9l3/th: f/8skhf awire 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 loophmwdv;x-(,t uuf;xc / 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, w /;;(x dhvtcm f-u,wuxhich 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 minef i e4ge 53v6i(;*gmjcd+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 generator with an outputxahx7k9)*jb) hjti; i of 12 V maximum when rotated at 60 Hz. A magnetic fiext; ) )7ajhxbih9i kj*ld of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator withxk lfc.: yuzni:k9 3qw 1d.8v)anjm6d 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.1dh311glgz hb 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 ukxnqd3/j8prjih x 60;7u povvr+2, shave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full ss;vvjxx nru,o p p87h3 d+q/urj2ik06peed 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. Tjjfvzpoaf,mfe 9d+4x ; z0(cx,n 4t 5dhe operating current is 1.0 A. What is the start-up c,(vx+4mf 9 ,jxz04f;a 5t fzendodcjpurrent?

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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 r1l 5)lax 6ftrkqm /*rkesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spr )x mkt*rl k5/lq6a1feed. 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-v/i-4 9ykeje0x jic ,us;v lx,V power supply. The ,ys v;-evcju/l e 4kixij, x90operating 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 ryl mrd6 ;whwg 28vd:x,educe a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tgf hiyzr:0g, n63clj1ransformer causes 14 A to flow in the secondary. How many turns are in the z ig06ly c3frn g1,jh: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 1/ijjzbp-. m5 mqc)+uji0cj 7m10-V primary if the 24-V sec 7z-cc)/uj ii pjjm5m b.q0jm+ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-t ad r 8(o0o19sior2qqfurn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current odoaq1qs i2o8r9 f0r( 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 transforid n,5yyqg3tbsfa 32 5mer. Assuming 100% efficiency, how ma5, i32g y3ays 5fdnqbtny amps 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 transfoq;pvp; 0bmw( ,7lxqe trmer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thx; q0mvt lqwpbe,(; p7e primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its se bsqr2/w6pch 73zp+w /wlxdo:condary coil. If 120 V at 2.0 A is applied to the primary, w6/o2 rd+zqx p7wwp:lhs 3/cbwhat 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 turns on its secfjcy9(2a 6wfwmdr zetj2 mm3z,l/ 7 9jondary coil. If 120 V at 2.0 A is applied to the primary, 3jy6j2j9e w7mf 2zcrwtfmz/d9( a l,mwhat 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 has 24b ff3 bi.n*xd00 turns. If the input current at the primary is 100 A, we can expect the output cubi34.*xdfbn f rrent 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 1x2f *u06qe .zzsjzi)3u q-jap00 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the .23q zjapjs0 uief 6)x-qz*uzsecondary 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 transformer7iyjj8 vm(+tne lz-w(4 eco8z has 100 turns and its secondary has 200 turns. If the power i788zywj+ it(lemz(- 4e ncojvnput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagohhuv;ejc5 168pdw qmu2xt, l+h(.ige is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prcxh o.qlvpw u(2th ;ghmud,+j6e8 51iimary 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 120w 1u q nru,bu3hf 44cbvc.)r-p V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total r44 wbfrbvc-nhu1u3q r)u ,.cpesistance 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 faxy9uts*jwc7:j /,q of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power ljs: t*q, wa7x /uycfj9ine 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 resista2al x1qv* x3 ,+d(zv;rob l2e.xi kq2gzh4 cfwnce 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 ratiov2x;1z2cqlr4lg+ zihxaq3. vo d*b 2,fxw(ek 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 - h)ks9q5zbi. y5s;;sv os uwwkm 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, thq 5.y kv issw5wh;sszo9;ub-)e 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 pt rp(49kgu:1feau7a*t9 e o xpower would be lost if the po *oat 4au1g7exfe(:uprp k9t9wer 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 generatorp)v t,yiccr +1/l0 0kdqxq4lj is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with l1)kq0 ydj/rc tq4p+i,vxl c0a 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 stored in tt,wb pwr7frap ;0s-6 ahe coil's magnetiswp;a6 0 ar7-f,twrpbc 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 rms7u(y+d y z+rp s5ok(/+ag mkesistor and an 18-H inductor. What is this circuit's tiyy+dprs5+k(mo kuga /+( s 7mzme 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 ci0d42 oj89q 4w ig/rc*kyigc bhrcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curreh+vezuz u4vmvaf.d 77 .1 l2funt?

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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 -itae e0o) 5a.c:zorxthe resistance of the lamp?5 oaa 0ixr ozcee:-)t.

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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. Wrtw c3k(o j2gije85bt8 l, s7zhat is the peak current through the resisto ctztg ,oj8( j8k7lb3 re5siw2r?

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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 suzu yf*dq (l 67+ 7dcsteimwbe 5ha6)6cpply. What is the power dissi6z7ms *d ci6q)67baldtwy+ e5c(hue f pated 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 re m9zpe.3kpdm,o0 bc/p e* +babsistor 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 9iu4m1ux p *ova 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50 oha *;qvcic (voh 32fv:lr7zca1i;,v-W resistor 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 5 f3yo hwq5i3v3xa bwn5(;tqd(5 iuqyat 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 2.5gbh) zagb 4 2henqqy963q1jx 00-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 14.0 W of inductive reactance?49 a4+gmfz,wij h--w4zdemrc 8 uta)w

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necess5 wd kg9:xc 4*pdo3:j7wiilscary 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 120 V AC at a frequency of 20 kHz (e.tt2 ;mje9-bi v50xf/;uy t veev)vxr:cvwis applied to it2ce.e:t ;ey tj0v5 /-;uevw)irmv(xvxvfb9t ?

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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 xoad5hudc ( zu4u6f889p2b tm 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 v5.aj ibm;l z6reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is nzlc4sf1qajsldkpl- 3jdfggs 03 6. :9eeded to have 50 W of capacitive reactance 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 capacitv ;ej6k2q cjj0or 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 reactaxlple9 5s x8w4nce of a 0.010-mF capacitor be 100 Wx9l45l8e sxp w?

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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(-yoj *ngn:tjh0 j7so 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 wu 9 ie dfql01(iz, qju;4jzp+iith 12.0 W resistance, 15.0 W inductive reactanc+9z( ; lp0fijjqied,qiu41uze, and 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 ,ye 4ybk/h ,zu*0elrn-mH coil, and 1.0-mF capacitor are connected yyuz*b/n 4r ,ek,lhe 0in 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 coil, and cheh /)z)jg; /lt st,k1.0-mF capacitor l) ;zhtjth//ek), g scare connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inducty4j b( ma)1tgqcowp17+p16 fs zk+utc or, what is the impedance at 1000 Hz?u(qk46gwtpojz a7 + bc1tyfcsp11)+m

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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 w (x ujxqrd df:4.p*m;yith a 20-mH inductor, what is the phase ang 4dx.f:u( *xm jy;pdrqle 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 8gdg6mzkt r2 kg(;1uss+ whd81.0-mF capacitor for a total impedance of6(dr 18dggs +;sut8gk2 zmwkh 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in ser0zonu fes u) :i29pgu3ies with a 100-W resistor and 15-mH coil to get a total impesuug9n)2i z3ou :ep0f dance 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 5 stbw+gz4xf3of g2s 1*li 64fw000 Hz for a total impeda1 4 6z3lf ws4i*t2fg+xwgsobf nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resisc vw2du26adnb* * xq(q6-iryqtor at 1.0-MHz for a total impedance of 150d w2 -nq vqy*u(*62qcbir6dxa 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 isb zmcg7v6lu1(h8 a ;dy the impedance ;vzu(d1b gc am6lhy87at 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 capacitor at 1.0 kHz for a titn*lxn . 9dq3kov*u ;otal impedance of 45 W ;nvtxdn* i.uk3*lo9 q?

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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 *tpp08j sk4ouwith a 10-mF capacitor at 1.0 kHz for a phasju pkst4*8p o0e 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 sezt 5 p*sat.no)ries with a 30-W resistor at 1.0 kHz for a total impntz.t*pas o 5)edance 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 capacitowtdvidj 8n /19r at 120 Hz. What is the phase adt89nj vw/id 1ngle?

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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 reqhlkm: wzz/2,upuh / 5sistor, 20-mH coil, and 1.0-mF capacitor are connected in series2 qp,w/lk zu5 zhum/h:?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuitvygc9 (g9ekp hm; 8x)v iz)7uv consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected cv uzxm eip y8hk;(gv7v)9 g)9to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactancei.jcov s8xd.r vxgt 4d*. i64v 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 th.rjc4dg86.xivvdi.o s4xv t*is 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 (s s2knvvqr:ct.4u l -RLC circuit containing a 50-W resistor, a 10-mF capacis-uv q.crnk (:2vs 4tltor, 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 with a 500-W resistor for a phase:)gs 8,qdz zl /3hw:.f(fsa7moqpbku angle of dz38ws( m .us):/ff :7qahzlogkbqp, $40^{\circ}$ 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.o*wd404*x 3gc yzom)y bs .r8pa1 xfhe0 mF. At what frequency should the circuit be driven in order to have maximum power transferrexm.fo)*sc0e yp3 xhw14b*g zd a4r8yo d 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 resis2k/q z*lxu4dp+ jm-pc tance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn/4pz+jl2kpmxqc-u d* ected 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 ACh,;tr ,xn.8 mgjdbe k- circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 Ws/.t vs9 xeo72vjzpl. . What is the powe ozvetj72vps.sxl9/ .r 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 ser 5,r srmqo:lo t+i8p4gp-5 dqeies RLC circuit containing a 50-W resistor, a 10-mF capacitor, ae5pq+-d5 8o:,rmgp s qlri4 tond 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 frequency of a 1.qagjbe:o,ul4 x 4-p +x0-mF capacitor and a 15-mH coil in series?bguox qjx+4:l ap-e4 ,

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-3rn f cv9a.azu :s/wk4bk9:cj1i m:himF capacitor for a resonant frequensk943chrwai:v9i na m:k: u j /.1bfczcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need +o+vh0x lt7app v6os(ed in series with a 3.7-mH inductor for a resonant frequency ofsp p+0t7 aoloh+x(v6v 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 40-mH 1f(hxxhq 5eq:coil if the resonant frequency of the circuit is to 1h5hfq:( eqx xbe 1000 Hz?

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