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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 exceptqubvh-9t *4(ys 5d n1cxb:sqb

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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 xhog4;b(qd98( kbwk np9k/o8kvp3mz4xj/s v 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 producespf *j9q:iwi-f what kind of change on the induce:w iqjfpf9 -i*d $emf$, 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 wire produces wis 41 .(j1ikdb o/htblhat kind of change dsi(t 1j h b1ikob/4.lon 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 c ja+li *yp u sxrzp(f)lnv5*88hange on the inducerpn(a8j)x+p*fi yl vul58*zsd $emf$, 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 mo4 l5ntkv)cq 86e/th sagnetic 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 int8 m)jqmwgzb ra43w 7* a conductor will be that which tends to producr384m mbw*at z)7wg jqe which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above w0w;j4e- iat e cftz g0dj*k:/its zjfit ekdw-at4;g 0*:c /je0wcenter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A b gd )ig+ghn(slpx42 6mar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil(g4px2hsl i nmg +g)6d, 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 field vec h nqai*rm75ibt8(y+ltor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coily t (m8lnbarq5ii7 *+h 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 wher4o x9+, yav lo3agp.cve 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 incr,o+ava vxlp4. y9o3cgeases?

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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 magnetic fieldv1yqgw+ hche0*y.m, j points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in0.mh v,c1*wye+hgjyq 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 carrjl8 itp.cl (lr55 okb6ies 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, t5jk l.ctlo pr (b586ilhe 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 ugp ism+ 7/flq am 8/vyo q7;47mrr(sab 4th/xof wire with the north pole entering first. As the north pole enters the wire, the indi a7ug+/87qy rq/mtx4;vrob47s(ml/fmap s huced 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:rdo o*e)1mup8vjy) o 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 orientation of the loop's axis of rotation if the i v)d1yepmruo)o *o j:8nduced $emf$ 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 atqyrq4 kp 2+oib b;4,j0yk5 qas constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must byk0;ir 4 sbq2y bpj, 4oq5qak+e 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.qaghw iiyqea68 3k8/8ohiq c5*);8bfwq 5zo f
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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 that u4wfo m3) o8shan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Ta)dmwj );gruo -+7y e p,fvhi6he $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward a9cf5c :z41kvitx5 isut constant velocity through a magnetic field that points straight down. Make a statemus1v 4fti595 zikcc x:ent 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 rote c)u9;b9j8bwo(qdzejf+ )g rates 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 transnh r*751.gdsr fdlimlz (11fcforms

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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. zm36ij 7zc 2vs,fji+y The frequency of the ,j s+jfm2 ii6z3zc7vy $emf$ 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 -4c/ws s bp( d(j/nbsjto

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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 t )q9 nl(xi/5pkc t.zbshat

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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 th wi, ;df;yp,b8+mcb aae secondary coil contains more loops than the primary coil thpa,+dc;iyfw;amb ,8b en 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 k-f6vo8r6 dkr1 xvu: cloops than the secondary coil then it-r1rvkd fxv8 6uck6: o 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 m(: q b9my zzps sf9mo1319ftend6yp *power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant1zefa 40rd8fqkh +*va circuit,

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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 a:sx4 )1xhkav8c p 7uc :ehoj*are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the hep4 uv* jc8ahsx k oax7)1c::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 connzejp at4)88 7fvlx7x ojq+9uz: w j*f r;2fvcxected in series to an ideal battery of constant termineflv7jtzxqz *)88+2c9 uj;rpjffvxxw7:4oa al voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected 3bw+ rv* rolz(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 resistance R,o+* dnub3oq p 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 sw6 ptz 4e;c9y m*prr:geries to a battery. The time constant for the circuit represents the time required for the curreep*6 wtcmz4prg :ry9; nt 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 batter pe bbd,w+i3.qy. The battery is suddenly removed from the circuit. The time constanp 3bqib.w d+,et 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 uniyp eld85vk,1bzmvb. sdno/.3 ts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. +gi*dt 6d(le s 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 circue :+ +m irvx01fsu.lizit, the currenru.e +xi+z :mf sv1il0t

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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 chang464yybls wjw r2h)t tch:7lp0. -rohj es by what factor when the frequency is triptwpshrob.4th26 7- yw jl)y0h cr:4 ljled?

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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 5qd(gym+j-lyz 2jer . AC voltage across an inductor is doubled, the inductive react.zqm+ry(e5yj l dg2-jance of that 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 th:lb2,cfg6 pdx if38-vhkt q :rnt3r0z e AC voltage across an inductor approaches zero, the inductive reactance of that co8z ,qbp3l0fi h6ftvgr -32 nkr:xd:ctil

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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 cxo7 h-,k.q8 (c5wbpr x3mlqox ircuit, the curren( c q,oxmx8w.hpq-r7kl3 box5t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacta 8t:loxj)vd1zr g. 6f dvpb899qu sn6nnce in an ac circuit changes by what factor when the frequency i n9 .s 61ufo:)8lrtvpjxq89d nv6gzdbs tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a cara6z vj,a8*hspacitor approaches zero, the capacitive reactance of that capacij86z rahsv,a *tor

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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 vsitm ykp e*uo7b2 7 :;ecw,*hthe inductor and capacitor in a RLC series circuit ipybs7o7 u* v*he2etc,kwm:;?

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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 y:e,9 f8csxe i/ss9uias $\cos M = R/Z$, 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 t-ym bkes9e)sc07bzxd; yo5/ xhe circuit increases if R increases. When is this statement trueo/kcms)y x5 dy 7bsb;0e-z9xe?

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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 circ, ydfs;qbd (8l26nc0j- cyo cmuit 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 oic*etdq* ,s t0yc)l4qt -2ol wf 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 capac q*fny1pdc-c h q--0uiitance both double in an LRC series circuit, the resonant frequency of tha* n1c--pd- uhcfiq qy0t circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonanlbp9,4nq jcl ;ce,

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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 o6ia 6v6sp u+rjccurs 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 fielt tejp10l9fqvshwm+ah 7vo5s2q * r+/ d of 0.20 T. Find the magnetic flux through the loop j1 f 2toaq* +wet5vs hq9v+p0h7lsm/ rwhen 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 uniformm 9fe/9lnxvr qs7(bulu-,f9 x magnetic field of 0.20 9/9x(lfuvr b7f9ns qlm,e -uxT. 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 radius 0.10 m is rotating in a uniform magnetic field of 0.20 jj1 -uj .kstz)9km5/pbreu4c T. Find the magnetic flux through the loop when t-.jc)1r pk4bk jt usj9 /mz5euhe 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 singl8s ;ytan5g: heo8sbx:e 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 from w8;afbyl 8/a pv7br)mh8psl1 $4.0 \times 10^{-5} \; Wb$ 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 tu bbg3kno)bx jw,zk+qa.x(3r 5rns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied .oxx,)krk (+q3awb3nzb bg j5perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 i sa7 2lfgkbox 5ysxudz f1(h346; hs1eq(rq: 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 area (0f 9r-zalbiv $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wh+n:n1htet x-tere the downward component of the 1thn+ xtne-t :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 (fd v(wk((xf hy /x 2:+htplkxangular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant :(y kp(vw/2txxh (hdk+fflx(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 loo hy i1sip2,9tops 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 wire ofpyisnb *ipuh09 s-oh5+(qo6x 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 )(jqp+dn9hjmq6wv9s 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rj99pwnqjdm) +(v6qs h otation, 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 consismisnt:bo - av*5ok2 -jts 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 t8ht30nk 16e dpvgj7l lo construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil07vtkpjl8 gn3d16eh l 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 ,si *rialbx-9 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 ,lcy xn- ags0(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 DCs lhv/u ex 6e-ho2j6:ebla7l 0en,fo , motor have a resistance of 6.00 W. The motor operates on 120 V AC, nh,: 6ve0ul aoos- 2e/bj,6x hel7lefand when running at full speed 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 kx qeo,di1i5 ba5 6r qx.fn2p:is connected to a 24-V power supply. The operating cur,iq. k1 qxr5eib2a 5:x6pnfodrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V poweedd- e0y9jqze zm6*t(gi7 aq 7r supply. The operating current is 1.0 i7d(ejtm *0zy- 7ezq9q6 gdeaA at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t5gh wtap8tj76o a 24-V power supply. The operating current is 1.0 A at ful8 g7j5pt6 twhal 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 iqdn2wt9.gj: /-zx 1 ayqw38vu5gvbwjs 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 of2hjv3ri6xh h8 a transformer causes 14 A to flow in the secondary. 6r3hv hi2xj8hHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessmv*ms*1.rj syary in a 110-V primary if the 24-V secondary has 100* .m*mr ysjsv1 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 a5q/hqr wmw7nd9tq4j- 2000-turn secondary coil. If the current in the secondary ist75 q9dqrj /n4h wwm-q 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. Assuafoek z1 ea-7-/rrzh 2ming 100% efficiency, how many amps at 24 V can flow in the secondoake hz1- az2/r-r7efary?

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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 1w hyrq1++z.ten)zk b sign transformer provides 7500 V at 10.0 mA. The primary+zryz.hkq b1 t)e1 n+w coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer had7ym ) 9;3m0xwbqfu;u m 7urrts 60 turns on its primary coil and 300 turns on its secondar;xyu m0u)3dutrw9 mbrf77mq;y coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sz) kv 87c-aw(sisd7c wecondary coil. If 120 Vw- saks7iv(z c8wc)7 d at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformkl.g ki9c2500df ej:(j :e essfsr8 joer has 100 turns and its secondary has 200 turns. If the input cuk: j:s lc50ee.gjjesi0(k9ofr 8d2 sf rrent 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 and its secocmid g6un1/)nndary has 200 turns. If the input volta) gnd 1icm6n/uge 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 transfklcg0.gjrbca- 5st j:w/8i0 eormer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can ek/gl0 e-i jsat0r8gc: bw5j .cxpect 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 voltage is usually s0o4glqscmyz 1 uy4kv9)x p2bodg49dnd( 2/ hb tepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of ty 20g k)s9du9ov1dqxb(lzy4 omhn/d4p 2c 4g burns 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 i;1ih.r dp.);wq oxh fgs usually stepped up to 4500 V by a transformer and transmrqp x.hwd.fo 1;h)g;iitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volt+p 5y(xv o)hl:jdv, gn qmxb4q gb9z69age 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 transmiss4gb +,vmbq hd)pl69o 9 : 5nqxgjzv(yxion 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 p7gl)1aswf u1 nef9gqt9kqa jc 5hc0(8i:4 aoresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not snq( w pot0g8a5cfa: iufk1)g 7qal19e4jch9 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 lonyr, xwr69vmt1 g has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In y m6rxt1r, v9worder to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 100z. u acp/g1bb/u3as2 qyjze*so33ppdd 69q0 r 0 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1/zq .02b6 931 qs*bcppagzr /sjdo3 ypd3uaeu000 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. p;sxat:..tvu It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator otvxa.s;p:t. u utput be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a curreg9vlcng0 hn r h)5a6n9nt of 5.0 A. How much energy is stored in the coil'sr9h50ng6 l vc)han g9n magnetic 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 containsoyif 7z+9jxhq*y6 5 sl a 6.0-W resistor and an 18-H inductor. What is this circuit's time constan7ifz65 s +hy yx*oq9jlt?

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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 indt(t9 aextu96 an AC circuit 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 1(y4v1bq 9qn ix20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. p/((7vv4+rgyt-, gex f nvaqe What is the resistance of the lamtv -p e7y,fev((/nr +gqxag 4vp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is x3pajy -j:yfsx)+)4zy w(b uq xlgs),the peak current through the :)x -bj4x q (l3p)sw)u fa+ysyjyg,zxresistor?

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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. W y mb)y *cvf*zc-wso6,tgp)x3 y06koohat is the power dissiot*o y)6zo m cw3fyv*gy- pc)b06k,sxpated 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 resistog2pz+9-ap:snj t wjn3r 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 65zyces7m )h9t meyfa.r .a, q50-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 3 k5nh5zav /4:mphu/ riqbf.w50-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 inductok ld.-p(aghet +ln4 )p41 mrtor 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 vbh ;ah 4+dpv(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 induco+il5h 5v8fyv nhx ki.vkz: :/tive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of indum;av++ ife4j iyut6, vctive 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 aush 69-em yjn5w.v:h(f t.u7b) anpg ut a frequency of 20 kHz is applied to imuunvut 6p-s.)f7hj(ynhg 5e: a b.9wt?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a ,jiyw-)fi mx: 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 capacitiv ur(w 2.opp 9uxr/la6te reactance 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 needed to have 50 W of cmf.*i*adh zt wk afio04w2eq)(xr-9dapacitive 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 capacitor have a reactancpq/-3 0s(tla*lg 5w7iysifti e 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 reactance of a 0bo +(jz4i0cxr r,+a fw myp8a:.010-mF capacitor be 100 W(x m+:a jb8foa ,pc+zw rr04yi?

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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 capacitoriq6emyarekk):s75cl15p)pwit-/ d z 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 2x b3 m+lpo3kdt ayca.mh7 )o;W resistance, 15.0 W inductive reactance, and 10.0 W caxkdm) .3poc+ 7mhblty;3 o2 aapacitive 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 10 b4 0/96cr9fuoi byo 4qzx6zqg0-W resistor, 20-mH coil, and 1.0-9 /o xbzrqub06ofygq46 zci49 mF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resist7xgp- wicyom n6q6 b.*or, 20-mH coil, and 1.0-mF capacitor ar.67- mqgyco*6wpinx be 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 p hw m3;h-swx87spf/pq 1pap5in series with a 20-mH inductor, what is the impeda php/mxpws-p hapqs 3 5781;wfnce 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 i h:(yep,y.((tykwcq m n series with a 20-mH inductor, what is the phase,.khp(yey (qc :wt(ym angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mzti- ,reuz95ww 5*vgj H coil and 1.0-mF capacitor for a total impedance ofuzg,5j 9w*zei5t v r-w 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 ist i46a sl.;c oogd p2f4f8t2vx.np (mn needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W a.p 422(4scxmfl8 optian;nvot gd6 .ft 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 l t otx;x+gz*6uo 2g/pfo,v;kat 5000 Hz for a total impeuo tf ;x6ggov*o+/ lzt, xpk;2dance 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 witkdwzo)-d- 5 ,-c n3sg 0esmzblh a 100-kW resistor at 1.0-MHz for a total impedance 30gbs )clso ,-kzm-nw-zdd5 eof 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 thepxg*ib v 6u*f nm9rdh-k:k o+w5e75ft impedance at +k79mp5tbx5euhifd6kvgw-fo :*r* n 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 needer d8yfu2- -fok tr 8rl; 5cgh0*cdxg-xd in series with a 10-mF capacitor at 1.0 kHz for a total impedance of ft2- ;l8rky-xc hu*r0gcfxo5g8 - dd r45 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 9z oe6 j:y-movkHz for a phase angle of e:m9y - oozv6j$40^{\circ}$?

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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 tot,m v;:+e7 d1dsmbsrdkal impedance of 45 Wdkdv rds m+,m:eb;s17?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 1sgry i32az 84g20 Hz. What is the phase anglegiz2r3y84 sag ?

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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 k xn 25cgg:jo/l/q av/e y. ;qhip-.zp5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriekx -i2pq5ogzh;vce/ja pgy // : lqn..s?

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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 cocyuy9 d-al; )zgdq/r2 nsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-u9a rlq2 yz)g c;ddy/-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 cagwpshp yb 8 4fu.2)5pjpacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flohs54 bywfp2j)g .pp u8ws 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 a 50-W+q*b7oc x7**zgmqxys resistor, a 10-mF capacitor, and7cmx *yxqz*os qb*g7 + 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 spld(q,9ca e/:r mfbec/ lz6;n n,xe(a 500-W resistor for a phase angle of d;mlx9 ,:fa qnl,6/zc/ne(be p ( recs$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 z mziqr f*v)rtm.d1amm+.k 93mF. At what frequency should the circuit be driven in order to have maximum power transferred fro.rtr dm*a mfmkqzmi3)9.1+vzm 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 110(hpyed+8e-g zl6tbv oe -mb 2.0 W resistance, 15.0 W inductive reactance,1--eeo8h+b6tezpg 0vmy dbl( 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 Aso-a2-ahi) + + 2xkdrfgut uc.q xg8a9C 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 impedancls9 /skz 5pxe5e of 60 W and a resistance of 30 W. What is the power factor kszsp5x9l /5e?

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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 ci dxqlb02qq57(i dqk1/k nt7ib rcuit containing a 50-W resistor, a 10-mF cakb (i1q q 25ltkixn/0qbd7q d7pacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of )nj*-z3 frp ata 1.0-mF capacitor and a 15-mH coil in series?*)nprt-fa j3 z

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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 seriee rm+218e-m dyncnf;g)re3bss with a 4.7-mF capacitor for a resonant frequency of 10 mge mfr- )8dnys1ebn 2e+;c3r 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(o e9juj9kir4.7-mH inductor for a resonant frequency of u4rke(ji j99o 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 reoz.qp62/d8 ksls 3x ejsistor and a 40-mH coil if the resonao qskz2.l6jde /8p s3xnt frequency of the circuit is to be 1000 Hz?

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