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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 unitnzd * yt rsax10dcp806s 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 inductiok3uy6l8qshi q p9ct*i f8z., rn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind -(bu;usu9k9 5mw5vxj u3rnzq of change on the m3ur5jq (u;99z n-vskwu5ubx 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 the magnetic b16ktla,v- 9hg y7ppqfield through a loop of wire produces what kind of change on the induce1pg 6ltpk9hya7bq, v- d $emf$, 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 producesx.-ts oqajy) )xl/yf4 what kind of change on the induce jq) lt.4y-f)xaxo sy/d $emf$, 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 magnk*i.x: n88 intisys0m etic 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, thd6;9qbblkxhq(mbzyy .q- )2 s w 04jdfe direction of an induced current in a conductor will be that which tends to produce which of the followi4 b jyhy6(b) -wfx ddkl;zq0q9qsm.2bng 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 magnecm*bm1p:kqgkz. ut)* sc.z /et is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abze.z:pmk c./c1*t mbgs)q*ku ove)

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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 abgx b u.wq(c:8t )v:hmzove its center with its north pole pointing down, and released. As it aph)xz.wq:(: ut8 bv gmcproaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the k :/cf2htaxym g 4 bn9gnd3o(/3yx,gxmagnetic field vector points straight up. The ma/fynom k4x g: cg/y(hnb9x,g2t3 dx3agnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magne 0+d 3zih6* b+4xb3jflzn,vzu5wsmvb tic field vector points straight up. The magnetic field suddenly grows stronger. Wh u*n+sj5bivbb 3+ 6lzf3zxdwmz,h0v4 en 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 horizonti8aq ejdd+p56 g7m3i g,dwea4al table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappearsi4j5m ewg 7adi, 8dp3 a6+gdeq?

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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 k4bd1im4e( m6j0 tgdnurrentb m d4k1mn04e d(6gjit northward. 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 loop of wire with the nors e-d3hb*rz7yk p.p )eth pole entering first. As the north pole enters the wire, the induced current w *73) zeryhdbp. p-sekill 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 angulaik 21pc* le(pdr speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must i( ep2*1p ldkcbe 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 speeus 5h,*qvhg*p d about an axis whose direction can be varihhg uq,s *p*v5ed. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.uh9g 9nrt :p1m
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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 thai:/ un* scbdz0t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnet w3jz vnqy2(o psj6a8)5jysq -ic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the *(.j xv29e j-d vfzz)0oidhqheast-west direction) is moved northward at constant velocity through0- v ve .qhz9j*d(h o2zdjif)x 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 angulab ),v;r.3(kxe)u:2sz cpbpwdxgm/cs r 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 transhe- )r;dr derl-cc+*z forms

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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 60tp ntb.l8) qm.. 0km xb3vwfvt*bm2.w revolutions each second. The frequency of thexktmbq*nw2).f .0vmwbbt.lp.mv83 t $emf$ 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 d+qe*o tgc8c8mv- skos b)rt::ra/ o.zevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a deg+m bad-2 b8mbvice 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 sea,ifxv r1te n z ulp;65;vx:(pcondary coil contains more loops than the primary coil then itx(xav:u,f5li;pet rn v 61;p z 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 loops than t3b+ l n slmemmlp*p0 oq ,wk(o4e14g(vhe secondary coil t(l1qp+e0m w*4b v3 ms,l 4gepkool mn(hen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the poweb tv*+ eycbq ohl+j-9 n6h8 s2j;17uatzr9 lztr 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 resonant circuit,o4cu eub m.+s+

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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 inductor0cxbay/mfz)ot8scs l:v07z) are connected in series to an ideal battery of constant terminal voltage. At the moment contact is mad7v0bclz)ocs8 0ya/s :m)ztx fe 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 ar10zcj h vf3nr gkp,;i7ke)kz7e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indzf;k n3kprev g cz1h,)jk77i0uctor 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 ihw n. qm0f(p7lnductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 is connecte(h*u izho7-hwv .19 g+sa, dsuzzk) xrd 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 inductowwn68*0b hwf+p*en/t j q1lmaobj 4x/r are connected in series to a battery. The time constant for the circuit represents the time required for the cu1+w wo//b *wf h8en* t4m0lqpxbjj6anrrent 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 ,gw5u1urwi-*w ;gt iz battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to deciw ;zgg - 51tuwir,u*wrease 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 followingl:676oi* 7e qmqh6iv fh /jvcq 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 an AC power s9ub -2a *i*jcs:mhqb*o(xs zix 7zwg7 upply. 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 cir2vdp1zlx5jn,;8hyr o0qjd9p cuit, the current;zo8,lr5v1jdh xp dyp2j09nq

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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 ckkzb7eb o+;h 4gf- )ug tx4(oaircuit changes by what factor when the frequency is tripled?k;ko 4f7ugx e o-hbt) gabz4+(

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled,a wazd1puty; ) +w1;nb the inductive reactance of ;)a d+nbpa wzuwt1y1;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 the AC voltage s:2wup x (v;zzacross an inductor approaches zero, the inductive reactance of that czzx( 2:wsvp;uoil

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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 amt25b-2yx f7prcue6 t8 ke)tl n AC power supply. In this circuit, the currenml2e76ytuefb-2r ) tpc8k5txt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frfjhtq3jg6gi 8 m3x 2-akqtx22equency i 2ft3x -2khqa63ggxt jqj2i8ms 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 vola//-oizs lh-5dt:ke ztage across a capacitor approaches zero, the capacitive reactance ofd /i:eh/kol -a-5ts zz that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltago/6aq)ff pfcafql(ar7 od714es of the inductor and capacitor in a RLC series circ76r cqf f d o)fal/ap7qoa1f(4uit?

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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 defi6c5mdd vm-5t rned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R i :i/h.ar vvxf)ncreases. When is this statement truehvvri :f a/.)x?

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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 t*q. n46npn /u4vodlmihe 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 seri92 pk0 2lnilzhes 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 an5 d wm.8or.wcpd the capacitance both double in an LRC series circuit, the resonant frequewmp5.w odr8c .ncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltai qadzoj :f05u ;go1dmhr3t lr052kh6ge. 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 occur(qx:enpp;zi4 s 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 f1 f;omfd b04dv 9dna6 lz(0tejield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and ( d ;e zjfd0vnm91fbotal 640dthe 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.rp8s5gms7we4iafq-i/ ngv7 :20 T. Find the magnetici ve:sfir57q ga/g-ns7w4m p8 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 fielnqagq-6 h xg)k/7wbvs*8:wj 4( o kgzcd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto w(j* xswg )hk8qn:6bva-c qzgkog4/7r are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single louh j(j+o6kez r*;w ut9op 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 co x1h(x:p x3ucfil changes 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 tdqw.: 3lcf *;hkkt+ hturns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50: *k;cwk .3dlt hhfqt+ 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 tt tp3 -oxfo-4wo.m*lcurns 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 bai: vux+c/ 1u 1ig(tr$0.20 \; m^{2}$ 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 horizontallyh;o dar98yajeex9 l32 at a location where the downward component of the Earth3 ax oa;edlrjh8e99y2'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 a2*ri +mrrjn6qt a constant angular velocity of 2.0 rad/s about aqrr j+mi6*2rn vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator ha,vi .:nfnpcx8s 50 loops 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 wiredny pudd 2v8ps: (6*gg 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 lofmki,oo29b5mus d; 8xng 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, whmo8 muskboif;d ,92 x5ich is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of w *z-)zlk m9pu jz6si6hg 9d1 0ol-xzhwire 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 constrf:jacwq)m)6np523izc koo .s uct a simple AC generator with an output of 12 V maximum when rotated atk.js cwi 6qo5ac)3z: )fmn2 po 60 Hz. 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 wit-:w7losyw 5)oib f,iv h a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto a s;bue9i9uxm:fo 4:qr 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 haliphd 2i4r)q *ve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bacihi)*pd2rq l 4k $emf$ 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 resi 8zm nyhba ,*m**cl2aastance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currb2*z,mahl 8m**cayn a ent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s2wa*(+ y buw3w1 zwsswupply. The operating current is 1.0 A at full speed. W sw*3ywbz1(w s2a wwu+hat 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 intern tf;u ;aa 92qjtwtr2s5al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 At9rta2 t2;qfas; wu5j 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 reduc/ry0j 74rkl nze 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 fl5:ps:+km lli/ t vf* yebx/x60ya woa)ow in the secondary. H s e6y m+5 x:a/lpfyklb/i):x*twav0o ow 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 tuka)vieg0k 2:a rns are necessary in a 110-V primary if the 24-V secondary has 100 turnk2:va 0ega) iks?

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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 pr,w9fis phuavd i,o )69imary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primarii hso,vudp,f69wa9 )y?

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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 3ic(jdi-uj b01g 9l nso)qv+mthe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can fb13oj 9sln ci-(u )+mqidg 0vjlow 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 tsn4zk*;csxi;ukk )2 bkx3z +b ransformer provides 7500 V at 10.0 mA. The primary coil op; ibx*4nz ksk;2z xubk3+cs)kerates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turof2 a1whbu:t 0ns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is preseaw0bho 2utf1: nt 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 and5wgnq1odrud iethbd 9, ./+y8 300 turns on its secondary coil. g +ynu.5bod ir d89hwqt /ed1,If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns anewe)yb yrpd -q11.j:34jtnxdd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current a)epxe-j1d.yjd n:3ry q4t1 bwt 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 secondary has 200 turns. 3r98f gv dr0rttnmj,) If the input voltage to the primary is 100 V, we can expnvttr9r m 03 fgjd8)r,ect 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 has 2)rdu l42 nvbf+cn 1gu000 turns. If the power input to the primary is 100 W, we can ruulc4bv1n+gf d)2n0expect 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 usua- zues,9wenn ;h0dlt/lly stepped up to 4500 V by a transformer and transmitted through a power line of total nt/se,0e-du h9 ;lwzn resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120gk32 jhbvi-hq qtpr19a k p2/v fy:2n3 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistan-:gpqfkjv13qk b a2vhpt3 9hyir/2 n2 ce 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 6r69l-4y 5 5ukm.jpzznk4 necw 0 A of current 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 percentagj4k-4 r nzeu cmz6.5 lky5n9pwe power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gej b7d.go5ym4 dnerator 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 tur7 5ym.gdo 4dbjns 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 total resistance of 0.60 W. A generaq3lo-m :fyeth 84f fj: gi/2kctor produces 100 V at 70 A. In order to reduclf yg 2oe8i f3h/fmtj-::cq k4e energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lesl rx9l6oj6 aaph*tr8j7ayy7 1s power would be lost if the pj1 *lox6aar9ljpyr8th 7ya 67ower were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 lh bpn5nbw1 qihc-;vyu/)::dA. It is to be transmitted on a line with resistance of 0.60 W. To wh n- bbwy1uchvdl:/n; qp): ih5at voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current ofz5r4tyclv56x(t n7u4f( w pvx 5.0 A. How much energy is stored in the coil's magnetic f(v7xl4fr5 ytv4c pwn z(u6 5xtield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Wha+6yei6yvr uj39myu ) zt is this circ j)y yvuym39uiez6 +r6uit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltawlp5u0r(3w+z qtteq) ge 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; h rakma(w(v 7mwuhcu4+(lb5 the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resisukduq /3a0f*9 t(s qtitance of the lamp?u3 k(s*9df/ ta0qutiq

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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 the peak cu)ad)fp/ 4-k5pen, vowkq-ie trrent through ) pq,dt vifp5e ka)en-w- ko4/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 - w400 3uh.ztbzej,x1pok vz6l3 u z*dxiy0oka 120-V ac power supply. What is the power dissipated in the resi * ywk,pj-ez3.6 h1iolv0dukzx043u0bz xozt 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 i5u pmjor(s;a zinrf (;/q(p 950-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-Wc4 tj/ b* vix;fzf/2yd 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-W resijk zje *)pw.3l 4w/sbv 8 ie4./bevgdestor 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 as,co2zvg ;2i: fd5gefxb gp+i,9l qb2 t 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactanckt4,g1, j98 l 8rje mml:r n5jgtagoc2e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wi xzj31zq9:gcv: h ogg:ll a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive /iijou(zupo,a2 c ,fkp-3hv ( 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 ,bs o) *50ct/ kphdcuo120 V AC at a frequency of 20 kHz is applied/c ch5p )o0do,ubt *ks to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current thrn8pf70sgk y7aough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance 0dcg pvg/d kt4; 1y kj0: +xw4maglkf.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 usw cgnf( r/:/5azs( hcapacitive 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 h,prn . mgm44c8svde 3save 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 capacitivews5.m5u-/hscsq5zxn6p o xy1yu.gq8 reactance of a 0.010-mF capacitor be 100 Wx5pnu/q8. .5 6 xsssqy-cu5gywmoh1z ?

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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 0.0010-2xi. qivo59ex o6 e,aymF 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 r;5hx jqgi6i:of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactai iq6j;x: ghr5nce?

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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 imp.vsvwo)( .sw;) y/ha ww-e arhedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?h/.w(aw v shs. wy)o; -e)wvar

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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 6n wgxlzu7 w:r/ e;;hg1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serzr7/; uh nlww x:e;6ggies?

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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-mHguyn jvv -drqk-9 :i;5 inductor, what is the impeda; jy v 9rvngk-dqu5-i:nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what at,k+/zd.ver9x h5v,0f tpieis the phase angle at 1ap0+95 h, v zi,kfe/.vrxd tte000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-m w8(tgz (c9luuF capacitor for a total impedance of 100 W at 89z(lgwut (uc 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 capaciw,w 3d u7ws3u.8kptjic r-t 4xtances is needed in series with a 100-W resistor and 15-mH c 8cw x733j4sr.tid tpu,wk-uwoil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in ser5pf,s a5jh- kpies with a 450-mH inductor at 5000 Hz for a total impedance of-pj5ap,5 skhf 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 re9+lec3wvev :esistor at 1.0-MHz for a tota+ece:vw3 v le9l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mFlhsmtn4ve )5sg7-zc:x5c ga+i c ); tg capacitor. What is the impedance at 105 ztv))mexitn as7l-g45 gc c+cs;:h g00 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 inl+/zyr*8ssyk1 )vg zr series with a 10-mF capacitor at 1.0 kHz for a total ilg vys/+z1k*yr sr)z8mpedance 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 td y 32m.7cb8z2 qbhgifor a phase angle 82.mhyzb73bt q di2gc 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-yb, yjl8zq(t7,ucko y .mfbqpr . p*/;f2j, toW resistor at 1.0 kHz for a total impedance of 457/oy*frkpt,j ,b., b8 ;lfycp.tou2z (q yqmj W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the pha ,quab5 wc4znw2 ;tvo3se ana,tb5nq;wzco3 24 uwvgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil,l kq gg 5dszcqg3gg rl)*r4/6+ and 1.0-mF capacitor are connected dg*/lqs+c 4q5 r )gg3gklrzg 6in 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 10.05vu e, vnth5y dk8va7;*-b cmv-mF capacitor, and a 0.350-Hy 7d-*ha c8evnbvmv5vt k;,5u inductor. The circuit is connected to 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 capacitoe -x12a,rd8 hvkf-vlv r of capacitive reactance 30 W, and an inductor of inductive reactance 30 W -1 a,xh-8ef2 d rvkvlvare connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circmfcqi. j3q,6e2 se bk1,q p9fauit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connec jfsfkmpe,q9i.2 3cbe6aqq,1ted 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 phase1(pnjkx qv3z9:v ms/ t angle o3 1kpz/9j(qts nxv m:vf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frenrt5fe/+ y.d pquency should the circuit bnt.d5r+p yf/e e driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuithvojq4xlr5 ) xd*-5ut) nlc8t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reatv-4)l *5x5dqrh8tcnxl ju o)ctance, 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 circu-xilp58)peh wjo21 efc89srz it 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 resh yc cp1f9b/2w8tn+hiistance of 30 W. What is the power fa+ fw p/h9ih2 ycc18tbnctor?

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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 a14:xnr gfs sr8 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power48s1x:r sn rfg 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 -wmp nnyv((mri w+c:(1.0-mF capacitor and a 15-mH coil in series?i +cv-nw:n(( r(pwmmy

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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 btf8n9lr;7u z capacitor for a resonant frequency of 10 kHlz 8rf9; nt7ubz?

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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 * 8zmrswss 1tazrby4;ri5 (f0 with a 3.7-mH inductor for a resonant frequency of 1000 Hz a0rm(y*sbz s8r 4irw f5zst;1?

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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 plac/o 7:dl dx5:hp-hm hnied in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000nmp:h-dx/ hli d7h:o5 Hz?

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