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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 fqdx 9hy.(a q)xj4 p)gw 1n4vvare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction sadxnte-o-6 0w .wnw+g8aga d-tates 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 prod7k oa5jcec9f/zy q mqle.q5-1uces what kind of change on the induce7. qly oae1zc 5m/fcj9q5-q ekd $emf$, 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 wirf)q u4ry t5n+ne produces what kind of chang+4 ytru f5nn)qe 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 onhy*5zx2 ; (l nkns5agn the induced x2nl 5;n yk *g(z5asnh$emf$, 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 magnetic fielgp1km01h3ounvu s :t1 *eo;prd 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 in5jfe8zv os.w,x;w5 91*vp , ctnrobgn a conductor will be that which tends to produce which o5v8 be ,n9;1 x,5.w wtc orjsfngz*pvof 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 ffca;t b/q5d 7horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induqdtaf/ c57b;f ces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ar :jezox8u+ t7fypt ynb2 4kg+y.y5c5bove its center with its north polyojc5yt7g+4r.k n5y:+yf8tz eb2xup e pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a regiaseh.+0b hm t(on where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducest(0m hh.e+ abd 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 lev)uxb wegu: p7p*x 2t;2trpbd8el table top in a region where the magnetic field vector points straight up. The magnetic field suddenw;:p8u2r*b ued pt x2bgp)xt 7ly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tab*u..dld( t pl fz0boj0le top in a region where the magnetic field points straight down. The m0 *lboz .(.pjf0tdlduagnetic field disappears 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 anaej4 h-w8bdp s5crqucjasf .3)b 45+ jd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one4.dc )suqbhp jaar e 43 -+jfwbcj558s on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fil6ek* e)zw9mf8((u5 xzfr9ss5rp qoqrst. As the north pole enters the wire, the induced current will be (as viewed from abovez*(kswl9r) q6q 9z(m5p5 8er sfofuex)

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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 rg,c:pvb oe2yg3fh *.u otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orio 2*b:e g,u y.pghc3vfentation 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 ag;se3 qc:zyzbhfore+2s 7( b -w,2wtcmj i4u7bout an axis whose direction can be varied. In a region where a uniform magnetic ffr ,u2t3(ogecm;ybw 7bqhc:z7j+ sw4z2-s i e ield 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.fd nhps,8h c4ff 3xe:5vx w9bp)6zi3c
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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 tqjp cif t-gj(piy ar mf8p3b+tz3:25 9hat 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 fielda pyfdi,9pp1wybn +*-f9urkd8 /s .3oclkzi1. 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 tc v*w7a2qcz(;r m 2pjwhe east-west direction) is moved northward at constant cjrz;wa m2p72c*w(vq velocity through a magnetic 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 rotates at a constant angular vegoobs- r,ip/ /locity $\omega$ 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 transfor(. jv 2snsqp4589tu.bgupmp rms

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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 freqeqw c 2xmn23t6uency of th 6wx2e cnqm3t2e $emf$ 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 use ylj6x 96e4xjxd 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 deviceurg4k3;kc4hwiu ggmd4 mazk/ nwafq :256k8 3 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 c1:pl75 b s*rdxivv9nsecondary coil contains more loops than the primary coil thbx s cip*:drvn1579lven 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 contains more lv a1skij2 g/ + zo agnbqq4:()uk+;pjioops than the secondary coil then it issi)+bp j oq:g;ak2vjg1a+4n/iqk ( uz 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 inpuuap:ml942; 9vid g lfrt

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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 ccf7/m eq9 zbr 6(coh00e7hurp ircuit,

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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 idet(f8dntwr /+k gdo,0tal battery of constant terminal voltage. At the moment contact is madeottwkr(+ddn , f8gt0 / 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 induc46kgaz3h8r ic exp i,(tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across t6r3ca iph8x eg,ki4z(he 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 resukp ee0z6iki .8d ce56istance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and res ul vr.ny/i4. q5ool ,t*wx:dyistance 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 t,2kfd9 u xuir9o a battery. The time constant for the circux rdkf99,i2 uuit 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 seri kn) 8mrk f3q;s;puv3.g ymot)es to a battery. The battery is suddenl)rkst. qf;mg)3p yuo;mk 38nv y removed 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 following have the same unn smrd7,m3m 3pits 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 supdhrz xc 36w/9u2(g1 zuytj*1c/b mdgcply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circ+d h,rzu3b1e vrxp:-cuit, the currenzc31du bp+x, rehr: -vt

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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 f(x mxqbi)0p1g gv/o-xactor when the frequency is tripled?(pi1gqo/bv) mxx g-x 0

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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 acrdd i5aiyb*:6bo ge:l2oss an inductor is doubled, the inductive reactance of that in2d liyg* d:ebia65 :boductor

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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 vo*3;g axk1qcmz e3e*otn q-h(m ltage across an inductor approaches zero, the inductive reacttkq1qo-(ae3ne h mx;**3gc zmance 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 supply8sg3+ya p,( gvr0om1xa+ f ukp. In this circuit, the current1fuk+ya ps 8v ( ,rp0mo+gax3g

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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 factok;qz 56ruedir8s y1ep1/rcf 8r when the frequency iscr r8 skiu81pyze1 e6fr/5 qd; tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltahjbd5nmb2a/nc 4i 05 fge across a capacitor approaches zero, the capacitive reactance ofn0/ n2cih45bjfb5dma 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 betbly7s:;na n6d ween the voltages of the inductor and capacitor in a RLC series circy;:7 dblnsan 6uit?

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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 defined as w0 9ui1n.*qa1xtafe9 ljccm: $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incred: v f/sjwd1i5u9g*as ases. When is this statement tr9i5sfjs ug /:dwvd*1a ue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The imam f q5r2-9qdmpedance 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 1w6pyou)y4 u kwd;gi7 2bjxl5gl0+hk 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 dourpws5 qzae 3)0+r;zsuble in an LRC series circuit, the resonant frequency of that circuit wil)q uzrps;5r3ws 0+zae l

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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 dzux0 xx,5ok 0criven 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 occurs when0.vs xejm2xlqg :3 k (1alxz-c*(d khz

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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 0.1 8b;.j uzdv7* eyvwip40 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through t.zu*db;7v8jy4 eip v whe loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2gnyncm- grh*j*6,m b.0 gm.ycnr *jh-gb* m,6nT. Find the magnetic flux through the loop when 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 radio y,fy;*x*uk ff (wipc(if-.r *mqq/vus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetf ,w;*qri(iq.*my(*cypf vx fu- /ofkic flux through the 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; )mk:erbg x75jihc3 v 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 changes fromx2g 1(l)gv) mme kcmx5 $4.0 \times 10^{-5} \; Wb$ 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 turq lg 97lz+f30f(p35nzthfmi:td tka,ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular ttg79z: qmz(3fl, k5f3+alh0ti dfpn 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 withsjqc 0:r2qq4k p;rj 7ar8-t )7pms lrt 15 turns 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 b7,nsqnm* 5qrwpp4/ws kd /c(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 oddkvhl:c- h )ek8 fyw;j2b w;f0pxq.2 f 60 m flies horizontally at a location where the downward component of the Earth's magnetw:cpv xd .8;we)b 2l;fh2jdhkyf0 kq-ic 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 td h(43y5uuoegw.v2am long rotates at a constant angular velocity of 2.0 rad/s about a verth(voyau4 et5g 2. d3uwical 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 crod,mtme.mg e- 0,1ajilss-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 10og(ml +6p4ccg 0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm ( 2z*xu e7/jquc a(;l luj1r:zgqwhe+ long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum+wrc/1uea:lh2x e zzlq*(; u( jj ug7q output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tur6+j,sx)j-zoua lhe5 ykrt0z0ns 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 0o0k d3xsyl)(tv;je pAC generator with an output of 12 V maximum when rotated at 60 Hz. jvt(dxl;p)003k yeso A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator w a,nk ux (vo;(p( .r0refqcdn6ith 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 a;*lyi0 g2 ahvkq 0h*presistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. T 1xt8s5ujq s/zhe motor operates on 120 V AC, and when running at full speed it ge 5s8z1j/qt sxunerates 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 fq /ap+.by dmvah4(al, 9j+ qfto a 24-V power supply. The operating current is 1.0 A. p.a dm l ,q++f4a/ vf(hybaj9qWhat 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 r px) ,xfcko09az;jh0scs;h1;4q if rtesistance 6.0 W is connected to a 24-V power supply. Th hcr0 i z;c)pf104jtxf;s9q k,sah xo;e operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is cn x/b 2 vic(ftku9v)z 9l)3fnponnected to a 24-V power supply. The operating ct x v/l9in3)2 zbpc) (un9kffvurrent 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 *e by.psobl 59k;m l;qis needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fz 7qrgr2qx4m; low in the secondary. How many turns are in the sec4;grm r x7q2zqondary?

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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 prima d+ m4wz7*domtry if the 24-V secondary has 100 tdt+wmdm7 o*z4 urns?

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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-turni i;or5 t6n05fn4nu uj primary coil and a 2000-turn secondary coil. If the current jr6it n n45fu i0;onu5in 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 primary of a transformer. Assuming 100% effici (mkxg6p7iz.;i fv xs+ency, how many amps at 24 V can flow in the secox6k7;(sxifv+gi. zp mndary?

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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 transfoso7jr. lj. 8 *yikvp:drmer provides 7500 V at 10.0 mA. The primary coil opej7jyrv l:p. kio8*s.drates 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 w5hj4b660uu8dnxw:;l upldmn q- 4c)d qz *vuhas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A isu ud4 4 ;xn*jnbuhudw5v)08cl -qwp :d6 6zqlm applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turtlhdn f5z4yeg9k ./hy0 )w* ozns on its secondary coil. If 120 V at 2.0 A is applied to the prim /90g5dyf wzktnhez o4h) *ly.ary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itw 6t (jgvuu saj2x3p2,s secondary has 200 turns. If the,js2w3xut j26( ap vgu input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns aj0y,-jtsi bmo - c34wnnd its secondary has 200 turns. If to4,3 m jyc0 niwj-b-tshe input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary h5vqa*4 lk 3uhxas 200 turns. If the power input to the pril*kq4uv3h xa 5mary 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 6y to0:0wk u .k7)vxkfk0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and t7o k f:kvutk x.y0w)k0ransmitted 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 curr2p306sqeuc 7tatkc) zent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmit03 tke2asp cc7)6uzqssion 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 att5)uqaew gq,aax 86cq 6g im/) 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance x6qgc)5)wu8git aq6/a q,ma e1.0 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 aj3,4k( cwseg resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce enere3kw(s cgja4,gy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totale4e9gig4rycj wm94 a 5d9+4+ffm a2x4int do m resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is l94+d4m9 tmdni4a g y25fmorw4e9exja4 fci g+ost 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 pyqi 70r2gv0r 9d-9s 8zkr cbzmower would be lost if the power were transmitted at 3000 V insteqr0k2brs 8m0 ir-vzdc9 7zy g9ad 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 is s s(0gqssty:r.q dqkni87ex.h2:; sf to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with ay:(2gf8:s70kh qnxeqsrt;sqd. s. is 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. Hl3*op3 tqgc t;ow much energy is stored in the coil's c;t lpgot 3q*3magnetic 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 inductorvzm(a(9k xxqkgm m 9+6. What is this circuit's time conxzvammk 96g(q9kx ( +mstant?

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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 7 cq96 g7ib(qjvags(urms 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 tg1 y2czs)bm7. 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 () a7 +id4jdi srf,g.bo8xnvm4( ixrfoutlet. What is the resistance of the lamxm.v)x,rrni(84 fi adsj f i+4d7bg(op?

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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 coye/ uweta1n,rf xp l((,cm (d0nnected to a 120-V ac power supply. What is the peak current thrfc1a/m t(r(wydn, p,e0l e(uxough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wr dj e: v+b,w*zh)qi)fhat is the power dissipated in the resiw+)bjdfvei r*, z h)q:stor?

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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 5qzxnf 5 tnpd(cd8 ,4:z0-W resistor 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 resistor is1h t/e8gbkpv3)9 ur irvk9dw wz4( tr9 $I = 0.80 \sin (240 t)$. 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 resistor io: z. 7ch cdut0i:ql:ys $I = 0.80 \sin (240 t)$. 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 in rrnea4 ioqq1) ym45/aductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1 ) (1qd;ze zs+u3qkxmt000 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 akk7 dw*f/0l vreactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessai 7abfh f7 v2;ftmnm4wl1- +m.f0tkxy ry 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 ozhm;x+c 9ttius1 paj. (i4 w07qi8xbu f 20 kHz is applied to i0t (jqp9i8sahc u+i7tuz x; .w14 bxmit?

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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 u atnwpazflf0l* 15z +-8i4mxp i;1fzcoil 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 aan*-k rt7t:s f 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactanc *ispy4 /rc2bss:/n;qh.q h07wrtr zq e 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 cl l*dzv ;7lh0qapacitor 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 b95n 2mm a)g,all2d8b unqyk 1capacitive reactance of a 0.010-mF capacitor be 100 W)lq2,a knynmd5 amu8 b12glb9?

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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 0.0010uvp n -8q1(p3 b4fbjui-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 Wms ffcm9lhl.chb j g-*ea4d3e., ,r,l inductive reactance, and 10.0 W capacitiv,f43 -rchlfml h,*.aed9l ebm c g.,sje 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, and o4+ebvb09v0b p kkfww* wo 8o/1.0-mF capa+ k84 p*b kvwfobvw0 0o/9wboecitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle yubj.f fg97y7)y:xa*u l wj5rat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor agu ylf: .wa59 7uyy7jrj)b*xfre 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 )9u / umejgz cslu*y.7in series with a 20-mH inductor, what is the impedance at 1000 Hz.e/j*u)uuym9s7 lg cz?

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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 7.:rwm ssj w(6hgnxsax /+mu9ph.w:mw 67(s9hn/j+umxgsxrsa ase 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 wqjo-hc l- 2/3-p71ysq, ct ;jg lszxn20-mH coil and 1.0-mF capacitor for a total impedance of 10wg,j1j-7s2lqt c / cos-;zn yq -lh3px0 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 capdgbre f6d806jacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance ofrd6e bd6 f0j8g 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 h ycua8z:6/4zu2ur ml )qzxk; 450-mH inductor at 5000 Hz for a total iz hclq)r 2xuu4za :8 z/m6u;ykmpedance 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 ig8syk/ qyke tma;,c72n series with a 100-kW resistor at 1.0-MHz for a total impeda782st;ekay/gm,k y cqnce 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 capacitxd00 w0s b z 7xvupqigy4oz:t,i:*wqgu *:b9nor. What is the impedance at 1000 40*0xig,nxw:b:z:pog7u sbuv 9d 0 *itq qwyz 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 fohou c2+n3)24qn j quzlr a total impedanuo u+qqc) n32zhj24 lnce 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 1.0 kHz f;z1 h9+v a+m5;sgg8uqmk l,s xsh3ybw or a phaseg+x a uw8h ;s1msmk3hzs;vb+gq9,l5 y 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 rmfp eu3os z)x*.dtow-8a( il;esistor at 1.0 kHz for a total impedance 8 osduiw( z-f t3l*;pxa .om)eof 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 cak7eh8 lp5t(g hypw d+1 , bljs0c+tsc2pacitor at 120 Hz. What is the phase angl70 +jtt(p1 gc2 lw dyhekph85, ss+lbce?

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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 4sv-4oajes 7j63 bh ds100-W resistor, 20-mH coil, and 1.0-mF capac jvsbsos7jh4d3 a- e46itor 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 capacitor, and go/u/6/k9lmhko x+qea9ux trqk 778qa 0.350-H inductor. The circuit is connected to qakhulq76// eout9g or9/x+k7m 8qxk 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 react1i(erq rgl2;0ta 6rse ance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currelr i(at1sg0e; 2r6reqnt 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 circuited9)z1q+il p y containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 1)+ dzypli9q e60-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 resisb hpdunj zf31nb4pl93 dr2b.oa):lj(tor for a phase angle ob1bj:n3)frpa z.pl3j4b d2nh(d9o l u f $40^{\circ}$ 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 = prx l (/8vt ;eivmf,p;1in;cc:g3xhr 10.0 mF. At what frequency should the circuit be driven in or i:1(x ;cm,eh8v3cni pr;tp;/v fxl rgder to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 1l z1ml6dxl(-mxg2fg +2.0 W resistance, 15.0 W il(z+ dmgl62f1xxgm-lnductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cizas-0elkjo8p6h xo+ v9c6x x2rcuit 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 resist*vww +ux20i ecance of 30 W. What is the power w+x2 *cewi0 uvfactor?

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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 forwyxigf/e/lruqzwd0- x5 58 ,-tstozpvis/( 8 a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectei,8tp u5xsy zzsq0 fw/l-d5er8(wxg/v i/t -od 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 s5(g w hhpmu6o mhyq*-4h fc0jylz38 6a 1.0-mF capacitor and a 15-mH coil in series? sh(zh6qc5m-*m6g4 py0owh3 j8yfu lh

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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-mF capaciqzv03 / y,pm6j y0qezator for a resonant frequj zz6/ mq0vpa e0y,y3qency 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 needed in series with a 3.7-mH inductor for a resonant fretrz euke*2 0i,c(x47hzk7g ch quenrce*4g,z7c u(hte 0k2zk hxi 7cy 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 40-mH ;3*s fn4ke fxzcoil if the resonant frequency osx;4 z fn*3keff the circuit is to be 1000 Hz?

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