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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 magz u8e5h(ovh3hnetic 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 states that (j somt8qzq5**a . bjyur u1yv/exj 0(q5)caz 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 loopodd2 g/x cj5at9s7 rx1s of wire in a coil produces what kind of change on theo52s gc/x9 tdxj7rd1a 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 strengthvq62n yy4we16l zu4 5c.a)sdrj7bbgx of the magnetic field through a loop of wire produces what kind of change on the inducbqz2gey)b1y6.d l4aj7v4 nu5swxc 6r ed $emf$, 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 chan-r97j+th6ks +d xjqehge on the indusejh6t+ x r+7hdkq-9j ced $emf$, 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 removedaw4pghr*5 0 xuxq59.f (yfjow from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor+ ewgk)+nlzefvo .+q- s2f.p i will be that which tends to produce which of the follow o+e+ew- k.2f plv.fis qz)g+ning 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 magn),gj);1 aqisjz.odq l:qd;nn*1t duf et is held above its center with its north pole pointing down. The stationary magnet induces z,qin1*jf a u;oldsqqngt);d.1 d):j(when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnetv29e 54r opoxb r8l6rz is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induceso5 b2rx9or pz84velr6 (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 magneticim; n*esxtqxn:,p,hm 3 d-zf oa9 7yn, field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense ofpi te;n3-omnz,: 9dx,,xmsy7h n* qaf 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 tabiu*tzphtz440 3ng3v ile top in a region where the magnetic field vector pointhi itpzn44t*g 0u3 z3vs straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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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 wr+nfu p7)a r0ji++shgb v4mp*here 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 disapp+ afubr nm +*s74rv )h0gp+ipjears?

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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-increaur d0o6uh7nyk0+ : hzv7 mlc:ising current northward. Two coils of wire lie flat on the table, one on e urzn0:k60uocih7 lmy:+ v7dhither 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 nortts,0b. 6tcv iv v/f 2md,ylz(bh pole entering first. As the north pole enters the wire, the i.ytvc s(vf z6i,mb20,b dl/ tvnduced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an/sa: lo8*1f /sq:ys7jbtd peg 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'sdo /78l: abesq psst/y1:f*jg 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 atu(wwnsc5 (hr) 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 5srch)wnu (( worientation 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.dry z;;w:i8iv
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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 thp6bumec v ijd.:jn-. buprg2pny/lb;t4::u2at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fs37 vxbo x*br,ield. 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 east-west direction) is moved northward at ln 7r 8lrwbb71cons71l bbw rr78nltant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotatz alfyb6z/9y 3es 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 transform-,a6j .pwpvx us

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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. Th( qt8s ov39m j4 +b tl9,1vyumllg.n.pdkf:g qe frequency of thb dln4gj9tsm,y+ 3vu qlt.q9:vf g l(o1mp8.ke $emf$ 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 devicxdo7km zo1+km xg :g-yf;* :rme 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 devicej, sp+get ,*js 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 thsc4-e1cguyy4:0 pdt ze primary coil then it is a-:t41yg dcspu 04ezyc

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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 lol 6 hsag3h5sgmtduh. i8+m(l+ops than the secondary coil th6a(5.huhs+ m+sg3l glimtdh8 en 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 powers qr 0xxc5c pk1e-s8vkdm 5u66 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 resonau i0/ cfgcyk;.8qso tgbcx73w;bh3c- nt 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 are connected in series to a*eyhph5ai1 1f n ideal battery of constant terminal voltage. At the moment contact is made with the batter1e*fpaihh1y 5 y, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battg*q1m7t pn.ai:c+ tinoi36 meery of constant terminal voltage. At the moment contact is ma3i ag1:*6pcei7q.mtmn+ ti on de 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 anq9my l ))oi8ukk;cl4eutq3e4 $emf$. 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 inductacgeeg:f udmbop: bks860 d4uz 1 04j:knce 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 connected in series t8mrawh+ 1h g8f ju3e tj (kjmsoa*(j15o a battery. The time constant for thekw jh(rma ts8o 1h3uge8*j5(f+a jj1m circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery l). :c(lgcz;hrycyx.k ;/ dutis suddenly removed from the circuit. The time constant:.tly l/c) k;(.hzruxy c gcd; 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 following3cki xnua2 /2y 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 supply. On this circuit, the currelz7 8 rh)4pxe;q zq+oynt

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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 conn8l 0jgj)4cst lected to an AC power supply. In this circuit, the currenclt8sj0)lg4 jt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancoa44u . p;yk./ozrhjkc b9aj: nkv3.4 iuzgh9e in an ac circuit changes by what factor when the frequencpiu:.hgo; vy4jz h.a9 k o 3j au49kc./b4nrkzy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubletlq+y: .6;mvz*hc3tgcsa3 d yd, the inductive reactance dmvy:scclgt;h t363+.*q a yzof 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 across an indrf3qwt v ut:vvv kn99ny e+7+vf-(8tuk h:ud +uctor approaches zero, the inductv8nqwf e: vr9 u3vvuh(++9 utn:t7-t + vfdkkyive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC powere2sj2 v nxwq(1 supply. In this circuit, the currentw(2vjxe2 1nsq

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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 changex/ld605 pkcko*w* pe ls by what factor when the frequency is txppd*5lk/ 60cekw*l o ripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the ca6f6f(2lcri 4 w l3,bdh/sxggw pacitive reactance of tha3b ,grc6w6f fhixw/d 2s( lgl4t 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 cap7 u jt)ly1p+*t phzg**kbx mq0acitor in a RLC se7tpqhzj*k x+lbg1*pt uy0)*mries 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 is defined 39g eedc 9fdly-w8 eg5as $\cos M = R/Z$, 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 o2 3m9hgg*yyyu f the circuit increases if R increases. When is*32guy9ymg hy this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incre(ifwqlkn1x9 *8w0gp wl a3-s/zgqp 3wases 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 /vth, wm.h0gze2 m:+fh ,nmqj of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubl.5vii u 6ish0j7jac(le in an LRC series circuit, the resonant frequen0iiilc6h(js 75va ju .cy 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 voltage. At res3w81 v:,bgnes ) flv6;bnmo yyonance,

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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 eg)jj u4o7s hv0,ucx 4occurs 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 rotatinpn rz6w m(52qrg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti2qn5 r mr(zp6wc 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 magne b *y04h wa 2ekti+zvo 0c( lm;m*-5hb/dtlmrotic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector+obmmhw- 0 50tilbz2*k *tm;r e( 4hoydlcv/a 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 unxzl7x1f,q* p t9oova;ep p n5gm3)5to iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thep px*f z17ge9 mo v5)x53l,topt nqa;o 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 sing9ztbce /he7ktlta(qd0 8 )fl4le 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 c+1( qblzsts49 eek*i shanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.jvw 38 md7j8i8qlrkjk4 4 :1nxcwqr/ 0qc ujm9 A uniform magneti x09qjq 4km8nw78ij r83lj/u41vk:wc qmc drjc field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 turns and an .h (f(cqbkeq0area 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 areakp1z2pa52st .luvli0 u( (nj a $0.20 \; m^{2}$ 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 flivzz 0-okl0 /fces horizontally at a location where the downward component vzk/zc fl-0 o0of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rmhj(49ts al8 notates at a constant angular velocity of 2.0 r 8s(jm 4thlna9ad/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 cross-q(:6, cc yuhljsectional 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 o1 2(hun2bjcfv82 avdhf 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 1 hmci*-9- peiza fx 0b-ntv+z12 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, whifx0-che *a vz-nbii 91tm+ zp-ch 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 wire rs4x(jyx. v. iof 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 generator4 kor,m((onktd5i 4su with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 4s rkm(kod (5u ,io4ntT 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 maxu+q qbzix;)/skai -4q76 bt arimum $emf$ 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.tkg::d ry5 z8hcyv 5ac(0 v1fx The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ozp6f2 gy b)v7wf 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a 2)vpf67 bzygwback $emf$ 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 ex,dy fll .gz:2i: dm6W is connected to a 24-V power supply. The operating current is 1.0 A. What i, :.imexlg zfdly :d26s 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 vxz wds1a;o81 connected to a 24-V power supply. The operating current is 1.0 A at fulxdwv8;1 1zo sal 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 to a 24-V power supply. T;hiqy+k iy(6yhe operatink+y6qihiy ( y;g current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer vd3 y*t)b 8lcwis needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causeso e69qcdre nv +d0ie(. 14 A to flow in the secondary. How many turns are(e0dc6v. qnd9 oeri+ e 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 necessary in a 110-Vr )o28,saafby primary if the 24-V secondrafs8 ,2bo ya)ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn second6de nq9wl : ;mem22ojxq55 qq(i7sgneary coil. If the current in the secondary is 3.0 A, what is the current in the 7qgsi l 9: 52q(5jnemqq;eo m2dxwne6 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 transflkk5)fu4akzt 2b 9 cssl 5zhz3b-9o /gormer. Assuming 100% efficiency, howz) 2sck9bh5t-u5al ozz kfs9k4l/gb 3 many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign uad+,jm h)c1btransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drc+b1h)ju, md aaw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secon2hb qy,qzmt8:wb yd0o2.sniag /4hk +dary coil. If 120 V at 2.0 A is ad:g nh b/2,aqthy +myk2i0. w8ozbqs4pplied 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 seco wrpy2kk) /ykgd62. o-mrw ji;ndary coil. If 120 V at 2.0 A is applied to the primary, what current is present in theo - w;kj6)r2.migpyr yw2dk/k 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 transforme+(7 xpx/5 :w hyth3:kh huogwvr has 100 turns and its secondary has 200 turns. If the input current atx:5u gv/w3h:x + 7htwoyph hk( 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 transforme- yvgn/-(eurwo6x, ixr has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpo gx -(-/w6rxevni,yu ut 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 itsf0n;or9e lju j,llv.7 secondary has 200 turns. If th.lou l;jl,9r vnej7 f0e power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltaob1ta)+tp qf- za2j.age is usually stepped up to 4500 V by a transformer and transmitted through a power line of totta .j-z)2 ab1 oqftap+al 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 120 V. The voltage is usually step.+5c26onkss xgj fg ncy*wt2g91p5 rxcy1w z) ped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Finn x2x5 .czssyc*gr w9yg cpgnf61k w j52to)+1d 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 qbv(w(.xp5 ((vyxfhsl(:ueg 9 eva b .g.w5yb current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted t w qbfbh(yxbp.g(v( e.gls(vwva.5x9 :5 ey(uhrough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W* ;urenzl (so 2eq9;dv+iyc r.o*q;qr. 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 origirl; d;n+ royce 2;qzs9evo . (rq*uq*inal 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 kg 8*t lzjq 3990ly-ogdbh+n xc07fhkum long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage 3 g7*f9q9-clxdhzgoyb08klnj+ h ut0of 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 pp4 ( el:dexk2;av5z xkg3w,ha 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000,;dhk:pex5g a ex34(vk2 zwlp 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 A. It is to be transmitted on apg-3a(hm klccf+; h1 ix5hp ;6x yms:f line with p-x;km5gf:l6xapcich(hf;+ hys 31 mresistance of 0.60 W. To what 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 of 5.0 A. How much ene. 7fkz ad+kx+53hbds prgy is stored in the coil's magnetic fiel3kf7h.a+xs5 z+b pddk d?

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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. What iu)spo-cho; 2eii,+ dzs this c,oohce d+i s)2;pu-iz ircuit'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 circu0jrz6,q2,73glyr9:qzem ik mtsdy e ;it where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?v1yi9d + xp n03l0ayqix )vsh4

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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 theksge ,m0lafw1 r9/1fo d hm.5q resistance of the laf 5k a0rqs,wfl1 9h1d oeg.mm/mp?

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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 conno, 5ru 9ovxmf *3dw:ixected to a 120-V ac power supply. What is the peak current through the resistux :,9or xdvf*5mw io3or?

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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 -9lt+y22w2bxcro+ i qw qk2ms power supply. What is the power dissipated in the resistor?qr - bw cs2m9xt+i2q oy2+k2wl

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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 resil:.z7yepfq2* x*fb o5nfw,n q stor 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 ay7st72 1y8zydb/ y/q 4uwdugb 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wv i1wa1x ,sq ,g,34cizfg vgo8 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 inductorzie8bv 8wqm,t3cn,h;9 ln .rw 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 f. g9cayh.r2parz6 :w 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 will a 14.0-mH coil have 14.0 W o+od ( n23qhychf 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 Wm0u52zkr oa 7h7a3bea 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;p, loy( hf iu)a9*zib kHz is apha9 ;(iyui f) ozpl,*bplied 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 through a 2.50-mH coil due to a 110-k1mt2 kst (g )4ng)d t0 s8naafok3ij-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cap62p) ef2 gx de8e-fdtnacitor 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 needl5x p:y0at, ssed 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 reactanc dxi)tdk ;,*(abu et le/l/er4e 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 7) lkcoincfbr() r13v the capacitive reactance of a 0.010-mF capacitor be 100 W )(v3) l1f i7rckronbc?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor a 3+e lftf knwo8prha 2+)q +(o+bmyw2yt 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 )+ ,hh++a lvnbrd6pge with 12.0 W resistance, 15.0 W inductive reactance, and 10.nhvb6 h+d,rlp)ag++e0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hzp3ot;g2kme 0o-b,c g h if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar3 ep,bgom; ohctg02k -e 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 a* yi5qko g5sd6 xhksu7,7jh9 ft 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected9s5dfsh j7qkhxky ,g*iuo756 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*kvt8fn(6kji ;d xyo 0 is connected in series with a 20-mH inductor, what is the impedance at 1000 Hzxyjk8 *;t6dnf0o (vki?

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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 seriva+ irq,+zlj9 es with a 20-mH inductor, what is the phase angle at 100 +rljia,+ 9vzq0 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 servn cziy q5)mja2oav;yn ;u60 4ies circuit with a 20-mH coil and 1.0-mF capacitoiyya;n qvvuom02zj a) c4 6;5nr for a total impedance 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-W resisto,, n n8 8f5b0q ugkqccs(5rq2pjv ac6zr and 15-mH coil to get a total impedpb2s0 q 6( jkaccfn5grc , z58vq,q8unance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5i3l3s mq/3 fs/5cbmn e000 Hz for a total impedance of 3ls 3m3i5n/ qscf/m be40000 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 resistor at 1.0-MHz for a tpe*d n wo,v9:( c3xx tmo) +bfhwmdqa 75yx-u5otal imped* t ox fm-veu:c5+b5w3,d opx9)dm7 hqxanyw(ance 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 wirxo+l 9i:zg jwta0c*6th a 20-mF capacitor. What is the impedanc lotrg wac0+:z9* x6ije 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-mF2tb/0i 6zl,c ,ulb 5;jkd trgmf0z(mg capacitor at 1.0 kHz for a total impedance gu,zljlc2 0/tmb06,mtgdbz i(; kr5fof 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 inw y 7m86/-yiryd rq2fs series with a 10-mF capacitor at 1.0 kHz for a phase angd wrm y/7q yy2rf-6i8sle 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-;be 472*iw ox;1s9l rn6 qagnipmjts5 W resistor at 1.0 kHz for a total p7g 1le9sr wsx6;tmbjain2*4;q oi n5impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor9-jvusrutv7:nw2 r -w7cc/m5vbga9 p at 120 Hz. What is the phase ab:cgwr9w295tru jm 7v-s upc -van7v /ngle?

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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 renv hoja/ ich,wu43r62sistor, 20-mH coil, and 1.0-mF capacitor are connected in serhu3i jo24nr ,v/c6wha ies?

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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,ztfgzk:o/* voe 4ad2 / and a 0.350-H inductor. The circuit is connzt4:o z//* ga2ove dfkected 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 capumf-i,()uj +5j ubh gmacitor 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 flows in this b)f -+hg5m( ujimu j,ucircuit?

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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 circui5ho3wyq yeeq4e.c6,s2+) x3srqusv wf2v)q jt containing a 50-W resistor, a 10-mF capacitoecqy.,yufs4+q hs v23 x jv52r6) ew3q)wqesor, 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 necessag8b0ovmgmrp 9936f hu7ua3xb ry in series with a 500-W resistor for a phase angle of xv 3u9gfp90g mb oh7m86raub3$40^{\circ}$ 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 m /hh2u a0hwa*bF. At what frequency should the circuit be driven in order to have maximum power transferred from the driv/ h abuhwa0h*2ing source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W inufx,hg:t. -inductive react: igxu .nh,tf-ance, 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 a myak ku94vc;,j a/fr0n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistan( (jo(2gwhy.jnlh cz9+f7q2tqw8nhs ce of 30 W. What is the power facthq(wshq 72g oj8(zhfw.t9y+ l2nc(jnor?

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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 circuit containingi,vcec6i2eu m.g ea1- a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?ce,au eic6g21-. vime

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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 a 15-mH coqv/y,k xyx62cil in series?xqy yx2,c/v6k

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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- qqjm; wkx0iv.w 4ou,9mF capacitor for a resonant frequencyk x,w0q9u4j w;m viqo. of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonasoq (3xc9p)t x;wbycd (t/mo8 ir5xb.nt frequency of 1000 Hz?ow8( ;/ x t5bpxmsrtic.(dyb)9 3qo xc

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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 ncs0h fs2z* ioh )s,9o 9uo;pain series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is t;co)os 2huf9 90ps,*soi nhzao be 1000 Hz?

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