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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: 游客未登录  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 magnet4fc )v b7hn8kwic 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 stbr2 :s- 1xx9 d8n. fckbtpo;ojates 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 of change onp nhog22boz)q8-u6(gl iyl( z the inducedgloo2 ily(zuq zg(h6)n 2pb-8 $emf$, 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 fiy3/8 bs,z+vg toiec7,jp yx (aeld through a loop of wire produces what kind of change on the ia,(y7 toi+vsgbjz x, ce83 y/pnduced $emf$, 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 kin-wc 0g+b8jk 5sz)jxrw d of change on the induced zw+g85jxkwr)c- sbj0 $emf$, 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 field u*6u)/*f/i z :is2kqz xgk 1xfw p/ndr3xkj-tan $emf$ 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 ofnonja2jeowhe2v. m)2s30+ : kfeapj 1 an induced current in a conductor will be that which tends to produce whic jpasfeo2a 0mh3 :neo.n )2+21wjvkjeh 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 magnsdi); ;/w, 1rkwchca2)yy s nqet is held above its center with its north pole pointing down.;2,aknc wiqwss)1rd)yc / hy; 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 bt.z8(sv a4 9xjt/t.mph z)vs far magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling mag).v(vxf s .zmpthzj t84st/a 9net 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 topbi/bg , tco8 )vlq36vg in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,bivv )/boc6 ,3gtq8lg 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 magnetic field vectoa pqc/s*obk. 5r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of thecqp5so/k b.*a 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 table top in a region where the magnetic i rsg o7u+dz (pf8+fj7b(yi1jfield 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 fie(fy g +i 8 uobdj7jp+fs(r7z1ild disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing k62 5sv14pyfz h1c clucurrent northward. Two coilslzsuc6y1 c5hv 4k2f p1 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 north pulca 7 c0d4sl,jhg)duu t--)uole entering first. As the north pole enters the wire, the induced current will be (as viewed from abovecjdsaucu tl ud,l4 -u 0))7-gh)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis who kohu1y27u. lpse direction can be varied. In a region where a uniform magnetic field points straight down, what must 7 louk1y.u 2phbe 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 angu;yn e0b-*cq k)h;u5fbj5xjgoy+f j -dlar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points st;k-e )jjfbbg0 o5x dc fhqujyy ;-+5n*raight 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. m3o 6r(ogkm.g4m zi4f
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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 kd/f/,4 jxrbbthat 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 93cguy 4o vqscxyk+aq7)djgk 5g)-5 jmagnetic 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 tmq5b.mn/ t cxr439nvqhe east-west direction) is moved northward at constant velocity through a magnetibtr n.q /m4cqv9xn m35c 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 velmt4sz,eku)5l) bt1rft30f dd ocity $\omega$ 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 tra 8sfj4m n+ncl f3c0xwa:da0q,nsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rota-xqsh)8c2ss otes through 60 revolutions each second. The frequency of the 2s8cs)sq-o xh$emf$ 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 u n 1*jxhe,so5vsed 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 d;(4zqbt- rctdj7nrp4 x hy;l. evice 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 secondary coil contains more loops than the primary co9nem 057htnp jil then it is n50jnmhp 79e ta

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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 contaiq k7y w(h(t.yqm6bqs, ns more loops than the secondary coil the ((hb,q7kyyw.q6q smt n it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power qtl)n jd)nx+teh+( 5minput

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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 resonank1h *6qm)o brbt 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 indqmdq4c e o4o9gx5 lp(+uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ao xpq+54og(cd e4m 9lqcross the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bah o y4/stlft)+3v+kzsttery of constant terminal voltage. A+h+)tsvy/lf 3ztk4 o st 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 to a t*kba1pk ))ivhtv 2w9;3plfdn $emf$. 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 inductanceav + ssf ;i1r1njsbb65 L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conn5mfx9jgm (v ;,nfr*mc3nvv; z ected in series to a battery. The time constant for the circuit represents the time required for the current to rezfxng ;3rm;vm vmcn(5 ,v*9 jfach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battb-ytpo5rjx53qr*tpz fz 6*+o g(fn+ eery is suddenly removed from the circuit. The time constant for of ty5t bzqf -(+n*rjpx35f oe p o*tzr6g+he 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 ha0hs blupb +8f4ve 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 supply. On this circuit, the c0*9m2e khsx8hux ik 9uew5pb5urrent

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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,2nj1mk /j*joguaq*hf 6 p:f k 1kdjus8;q 7zy. In this circuit, the current,jyj6 f1/skk zqhf am*q2j7kupu81 dj; *on:g

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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 a(3*ymp. xs gczn ac circuit changes by what factor when the frequency is tripled?cy3.*(gsmp x z

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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, (+, 7 gic43y7 t7rzv+kyumdrccpni/ ofdnd--the inductive reactance of that kic(n + irdm,y t 7c-73-g+ fpn47rdu/dzoycvinductor

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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 voltauj;s oqb*iw 0p.ws(l np496ot ge across an inductor approaches zero, the inductive reactance o i46supn*jts0o(pq.ob ww l;9f that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thity,0:4 s eiypqs circuit, the curren ,peyit0qsy:4 t

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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 whenet0+aym 9aku8:4l czo the frequen8z l a+c:mt9kou04eyacy is 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 capsupm. zo -vcpwy)uc 52 6nvp:4acitor approaches zero, the capacitive reacta vopmp u5p4.6y nzsccu:-2w)vnce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitord7cjun fdo6 e.s/.jrz5kck ./ in a RLC z.5k /osd.fc/jucnrd6e .j k 7series circuit?

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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 03fuwab o:(hdc 4w /og*zk0keis defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increaseb 6v1do*m :m*;tifbxcs. When is this *vbmc fi :b *;1dt6mxostatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the o3unah19jq rzc)55er 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(8zj/.lzok l d +7woos circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the ca h* +(whcnzcj0pacitance both double in an LRC series circuit, the resonant frequency of thatnc h0*j (wc+hz 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 l41 2pw y6rqw if2c:b(embx.mresonance,

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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 RLCx2)a(vy/ejb f circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rj0 )(*knijurx otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t* xr0(jj)kinu he 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 rob9;1d1zhsitu zna:5:6 hzxujtating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when juz5 n;i:hhxa1 d9z u:t1 b6zsthe 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 uniformwvci,- k/;n q1 *v*iuqgqhsr ) magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of hqsq-g/iu, ;v)rwc kqvi 1*n*$30^{\circ}$.

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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 (xx1zj3u 8bssjb tc(5+ob mnaj5w /j9loop 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)*x+b+u genme $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. um6/eyt7m;r *y :ybcbA uniform magnetic field isc7 :mruetb m *y;yb/6y applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 c6wx,+pz h)or 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 area )bhjd8 vs7h3p$0.20 \; m^{2}$ 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 btune*;m f3;g+wk str) 79o .knx4coe m flies horizontally at a location where the downward component of the Earth's macefm7.wtkob9g4nut r k n*;; xse)o3+gnetic 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 angulamk r-me:-dk r1r velocity e kk:m r1d-m-rof 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a yeie2)t -a1eg7wwovc304furcross-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 of5 dhd75a g8) 7jqxm4jz(,vf bsot6gu e 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 ix4e)u l*p ed-bwkn0o*s 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, wdp- *)04 ku bex*lnwoehich 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 wirenl0h8w5es -pg aol;5a of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generatorlkm*:8 evc.dl with an output of 12 V maximum when rotated at 60 Hz. A magnetic fi8evmd:* .cl lkeld 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 with a maxi/dguh 1n.m5 nr i./gjjoa/qm2 mum $emf$ 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 resistanceg.mbly3 ;rv2c vgv98/ 0w egcl 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 motori6cj 2 v1o(sxcl bb*mrx5 rqcf8;xn 76 have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba ib16 jxq rscfo*x m2v5lr cb;7(6n8xcck $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.v l: m-g:,mbkoau7eh) The opera o-gu:mbkve7ahl m ),:ting current 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 power sug9tv4tf j9 *xmpply. The operating current is 1.0 Af4*t9vgjt9m x 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 connecte2)zy ( y(2a;p-d no.gmrbgtsod to a 24-V power supply. The operating current is 1.0 A at full speed. What imo.yodas22g (yg z -ptr(b);ns the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primard qqs83nb c5e0y 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 causesf r+ky zn6hx2go:y ew)rt 9(x7 14 A to flow in the secondary. How76 zyeh+rf x:yk oxwnrg (29)t 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 necessarg-hd dl *p.:iyy in a 110-V primary if the 24-V secondary has 100 dh-gil :p.*dy turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-td 7 +.eisc-shzurn secondary coil. If the cur.dses- zi c7+hrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of avh1 ph6 biybu.;.eru cba74 z2 transformer. Assuming 100% efficiency, how many amps at 2bcuu.by.z 4 bphar 17ve6;ih24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon signu-b3+5y0as mw1odaaiu8 le0 g transformer provides 7500 V at 10.0 mA. The pr3aiso8a +y gawu lmdb0ue50 -1imary 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 has 60 tu)blk s7s0kbu2kme ;0;ox cgt 4rns on its primary coil and 300 turns on its secondary coil.bm0gkt7kk0o x)2b; su;es 4cl 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 ph f:1 *:vq )k7mdhl)grklu, jits secondary coil. If 120 V ajv)qkr:m phlg 7 *kl1fd:) h,ut 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 and its secondary has 200 turnir+, 0dumdt i 8v-.gxkoydl; 2k*q73a mkrzr*s. If the input current at the primary is 100 A, we can expect the outp q ko+*rg k.0 l*78xr;r-itkmmu,za d3d2yvdiut 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 7d 5) l8 hqf5lhczr:hov7epg/turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondhvo78)r:/qphhe llf5z 57 dcg ary 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 ozwo9++e:t lusecondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the s+owt l:oeu+z 9econdary 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 ercc*/izgbwq+q gl ;0ha,(n)A of current at 120 V. The voltage is usually stepped up to 4500 V by a trqhg g qwlbie;c(cr )nz0a/ +,*ansformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cur o-n77 je508oa3* ippdhv5 g.tfrotavrent 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 percentagop.en 7vadhf7a0 tg -5*53vro joitp8e 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 9ics20c6c ;x fno rwqc sm;/o860 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 tc20mrqcnf 8is;;o /6cwc so9xotal resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km3v cz8+,wuq7lqus ,kc long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to r z3u+qqc,lu,ks87vwc educe 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 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 generbbx+k,x6 d y* c(3ekldator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped(cx klebdb x*,dky +63 up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wou rv 3.8uv6,f p8sdu(izkz7hy kld be lost if the power were transmitted at 3000 V instead of at 10spf8 z( rd7,ukz.v3iuykh6v800 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 isq owvo(kt:,l w4/b(za to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if th :4vwzt booaq,(/k(w le 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 xxjd,36qfnvf2 ,xwtz x2e0 x2 of 5.0 A. How much energy is stored in the coil's magnetic field2, 3qnf6 vxjfxxwdex,z22 xt0?

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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 19rbdm2ymu oq/ ,hob(68-H inductor. What is this circu2y, b bmduoor h9/q6m(it'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 whe,*n tsakedz-ky6/v-ot.zw 0 hre the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is 7rrtsm +lhd1hbmmnf+n 7+m)2c p. h6dthe 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 6j0 9fsc. c mexvdxw(:w;z)sris the resistance of the la;9 0j:swwrz xc()d6 s cf.mxevmp?

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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. e76tw 5ckrpd: 3qt(a;wduez 8 What is the peak currentw dkrpae6:t c utw5738qez(d; through 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 xjx( ys b-5m*kto a 120-V ac power supply. What is the power dissipated in thexbj(-sx y m*5k 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 m0+nlsd ro3f4 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 ise2kgx :7r o*js $I = 0.80 \sin (240 t)$. 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 x +srj;6om na +qc09;veeo 1)/ hjwtwdresistor 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 indun27 l qvw5;olpctor 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 2.50-2oe0lfv ,cz)t5: x4agfz fjzhlz:55 xmH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancevn 7fw; fg*bb/?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nece9wi)k vnbssx scjvlp +:(0l. )ssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kd02fqdv6cm a+ Hz is aa2vqm6dfc +0d pplied 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 throuqn5 uk;5 fu.oigh 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 capacitivu +) tzm;dstwt)w3;5ukch*e je 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 l zfd57u3jd+a:t xd.t to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a rede2;y v u;bn1hactance 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 0.010-mF c zyfh5ids03pk3r-w +r apacitor be 100 W?dfrw3y3kpr+s0i h -z5

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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 0q(py*bp cxea.iwe.i 7;8b)ku x6b0 zp.0010-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 ser m1 4p5nx9nxw6+xtufgies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacfnnx6m gupx 941xwt 5+itive 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-dxbh86l hz;)m) +qksp W resistor, 20-mH coil, and 1.0-mF capacitor are conlz)+hms k;)b8 hdx 6qpnected 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 H8va-.y3mr,n +d4 mcqutso 7v1+ lq3bz wjy td8z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitorv rsmbjdnotly qvua+cm487y w. 3 t+d18,z3-q are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in k8hs:qqety)ih 710 wuseries with a 20-mH inductor, what is the iuh 8:7esk 1tyiqwhq)0 mpedance 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 connectedv3 kvu;5)s4k z vj7ojl in series with a 20-mH inductor, what is the phase ango jv;)3k 5ku47zsvv jlle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.ocf09a: q *vol0-mF capacitor for a total impqa o*f0o9l :vcedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-,pwr(*loh5cfe 0 j pw8W resistor and 15-mH coil to get a totaj(cp o 5lh pwrew8f0,*l impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indx;03nfu2 zfjwuctor at 5000 Hz for a total impedance of 400003 fzunj2fwx;0 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 wit h 1b7lp1wu3h8i xa(qih a 100-kW resistor at 1.0-MHz for a total impedawi1 13hh7auxiq( pb8lnce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor.ldkqq. wdk,ftz*2e8 sotsg:1 1e+ ipr 6+i r-g What is the impedanlpt eo fi *61i+ gt1wgrkd8-2: .kesqzds,+q rce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.zo-(5iy5 pem iz;0awh 0 kHz for a total impe5m poyz-i w0iez;5a(hdance 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 19k s2mrm 0gpp*fu/yo:.0 kHz for a phase angle of:mr g0ufs/mkpyp *2o9 $40^{\circ}$?

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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 resistt +na2( dtlhn4or at 1.0 kHz for a total impeda24dn h(t+t lnance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in seriegxt qz5-a/j74p: awhd s with a 100-mF capacitor at 120 Hz. What is the phase a5 a /h4azx -pgd:wt7jqngle?

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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 alga*a, 39u qtund 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sl a93u,u*gat qeries?

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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 as pn4ua cg s3h,;0*vui 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rungh; * 3 ,aups04svcims 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 capacitivj27(s pqx(ebwe reactance 30 W, and an inductor of inductive reactance 30 W are connected in 7q b xje((wsp2series 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 circuit containing a 50-W resisto/6 vku8eu u qnu8i(0tgr, a 10-mF capacitoru/u86e 0qigvkn(uut 8, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resis9g1z9csb sez-a5 1 asrfy7/ tztor for a phase angle o aefta- gb5r1z9 s91z sy7zs/cf $40^{\circ}$ 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-f03cywzed52/ m 2yrwl mH, C = 10.0 mF. At what frequency should the circuit be drive2f dyyc2z3mr0ww5l/en 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 0n d;hc)7c /t ermzy)k/v- siav) xj1gan ac series circuit with 12.0 W resistance, 15.0 W inductive reactance,zc ax0kv /1n-vtyrcdih)gs 7/)) ;jem 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 circuit v l7(el6aa2 zcis $63^{\circ}$. 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 imie1 yw)n p-w1hpedance of 60 W and a resistance of 30 W. What is)1hp y1inww -e the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factorjnp3z*1hx9p j h2gzm ; for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and 1 zpjgmhx2nj;p9 3z h*a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and igedz/l l:1g2-vb *n 0c gb4qja 15-mH coil in series?lvg j2 *e/zn bgbl :1g0c-qdi4

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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 inu u53i8laqw0+l6vte jjz0r) v series with a 4.7-mF capacitor for a resonant frequency of 10 kHwle0aqv5l3+)jvtu8u6ri z0j z?

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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 i3mz77ym(6dmptb/f sx1rg ea: n series with a 3.7-mH inductor for a resonant freques/pmyxedg m bz1t:m7ar7 f (36ncy 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 c-v+1xe p )my u//gbhypsr:9lno*dgr0oil if the resonant frequency of the cir ov91r)mhp0bgr /ed*g :npyxy-l s +u/cuit is to be 1000 Hz?

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