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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux 3 t*3s.cixwn8 b gr/pbexcept

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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 the+bk cc m p5mv4g,md/gh+68yf f $emf$ 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 chacxt4g:j ttyog 9 u+l80nge on t: 4c 0gjt8t xy9o+gutlhe 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 field through a loop fb 6(kxsu q45fof wire produces what kinqkf54s (u f6bxd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces wu*dj0vh p1u dnx 1ls.059h opthat kind of change on the induce01n pjvpoluhd*xs50u19h .d td $emf$, 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 magnp( .93xdhanz kagpb6:xj.-,8 u b zgbjetic 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 cond 7sz7 lp*lntjep;/ m(quctor will be ezl 7pn*j/ p(qlt7sm; that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hem x ;(6hz9 ccackasv:/ i(iy3p)/yv pwm,w4kqld above its center with its north pole poinzicx mk;)qvi,cckyawh(4ypv6 w /9 a:3/m ps(ting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet ig8m yd/hxx/f;y um a. j4gu0c:s held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vy48/ dx f;jha ucy /mmxg0:g.uiewed 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 axpqtp5*( 0xe s region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense *p(x5e p0 xqtsof 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 85 .hbquy s*k cipkk;(the magnetic field vector points straight up. The magnetic field sb*p qh. k 5uykic(8k;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 whb 9.tb+( nu.w/ifqon2g f-fnsere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, w/bin.f.w fnnu -qg+f(t obs 29hat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasina0 j-vmz )9fo9bcp7 kx+u iyx2g currentfup7xo av)m2 xzi+by 0k99 -cj 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 north pole enko(lgod3 s phg66ai(7 tering first. As the north pole enters the wire, the induced current will bi(6l76 hdopk3 og(gsa e (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 axis vt4 1cs;o)sjdwhose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 4jsd)sv;o t1c 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 conskql f72w77coftant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of r 77q7 fkol2cwfotation 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.+g rr,ik4gctvl8vn +ev.e 6e:
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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 v ppd6-wd7l, nthat 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 fie**jfl ev )fe)zld. 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 mo/ mem4lamt wq:pn, i1*ved northward at constant velocity through a w/ nimt,e lamp:1m4*q 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 costw ze/e8l -h1nstant 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 transformskxhvkzx) 2(l-

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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.mxgevs2w16 mkw+8o09v s +fnm The frequency of the+fmg9s0 wv 8ks mvn 1xew+6mo2 $emf$ 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 usedt1ab ldoi 51-x 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 devicebr; 3h(ite 9uo 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 loo d i82/ope)qxx4hfbo*;n 6ri kps than the primary coil thq8rifid ;/ p6*n )4xbk2oehoxen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil : xb o-yal0i6r:f-qpmcontains more loops than the secondary coil then q-0fp-ba : 6lriyx:omit 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 ij95ypk4:mlu unput

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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 cizt 7,,w ed;8yf/uvee brcuit,

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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 sf2,cg0.s lud peries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is0. s2l,fpdu cg

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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 idealq ncz t.zpn2;yq8.w3 h battery of constant terminal voltage. At the moment contact is made with the battery, the2pcq. .q3w 8z nzhnt;y 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 wil :ff3ee4/mr+o ruw .lth inductance 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 connected to mi38as8 ,qpp2q d/yklan $emf$. 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 curjiu 3c6d(8wonnected in series to a battery. The time constant for the circuit reicud (6 rjwu38presents 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 inductorpugk:mz gef ,0ughwj x6-n):5 are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requigmnu5 xfj6),guwe gp z::k-h0 red for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uni2kq9 f (vwmt(mts 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 cu, iptn)d m(j998c1lezx -nwnw rrent

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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 circuit, the currw.tq9 ( wnpugmu 6m8nc 7j73omentn39( 6jmwouqpmg 7wtmun8 7.c

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what fact5kh ,bmg 8k4khor when the frequen 5gm8k4,hh kkbcy 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 doubled, 9- ftrzv0 1 rpbx ukl88bfv 5epfa;3p3the inductive reactance of tha-38zbf f evrtx0k ;15lb arpu83ppv9ft 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 inductor approaches zero6lmkv cjcg4 ;-, the induc 4mjl kc;v-c6gtive 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 cqy gtslqnk8o 6jd:*48onnected to an AC power supply. In this circuit, the curresjl4g*dt88n:oq 6yk q nt

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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 wh.-iizlvecl(g4 yt / bh:w.wr e: yl,9cen the frequency is trz( gli/t:-cy: v9lrhclb, ..4 wyiweeipled?

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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 mi+ n5p 6dals5d35a ibj.h) 1jn2grptvoltage across a capacitor approaches zero, the capacitive rehl52 n)ap ni1a5 bt jgm.dds3+prj6i5actance 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 ink7eauz )x.zw c80 u8vnductor and capacitor in a RLC sevw )kxau07 8c zze8un.ries 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 (dzv1ge8:stxcircuit is 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 increas7oa5dt.2ob a ees. When is thoa5o eb2a. 7dtis 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 ofgp u6e6a0 *3qto-ey qj7ui2a x the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of tn(r1dtt0j lc)m3lpqw*1 s o1 ghe 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 c. e:7oef3hdlpacitance both double in an LRC series circuit, the resonant frequency of that circuit7e:cdhe3. f lo 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 ACy bsg;q,1y2 oi applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui,iqnr7l m(,z tt 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 rotat ;0hslq6)q mhcing in a uniform magnetic field of 0.20 T. Find tqmlhs;qc )h06he magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m i/ojeyu)2oj9v12p s kbs rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the lobp9 s1oy/o )ekjjv2 u2op 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 507qitrk hk9:o2fv1e3 nh jch a uniform magnetic field of 0.20 T. Find the magne7hj02 3eiqthc:f9 nrhkvo 5 k1tic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fro2)i 25zszfhcsag 4/8 +us1 ay4nuieyrm $1.0 \; m^{2}$ 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 v1 5nkbl:6tpffrom $4.0 \times 10^{-5} \; Wb$ 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 si ,5zzk(b; y.ozx;ts frdes 18 cm. A uniform magnetic field is applied perpendicular to the plane t xfy(z;5bos z;k, z.rof 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 15a: 8olmvqwf:1*0 zja i 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 uu u0j*8lozaen:1c8)t*u tmgand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span ofi: m5+mlm qqd /imxg6m 223krc 60 m flies horizontally at a location where the downwad/mq :r 252gkmmxmlmq6i +c3ird component of 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 rotatebb0qng4m .az-35f l xs0au*ems at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic f-usf3e.qb40 *agml5xznm a 0b ield 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 andz+n p-5omfk- tp b0:3iuxle(n a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire oflzeh:;fv x,(2yxq( e e 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 armp7lsn3x w(5(nyp 8 l3gq;s7 6hldcxdeature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis pn ;(q7sng(xpld3ll36x y7whs c 8de5 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 conseno,nxx j a) 80;q7n6frp gv;-jgc x1kists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generag;:xl3 1jn xibhetr 252b ht7etor with an output of 12 V maximum when rotated at 60 Hz. A magne275ntgbx l:hre31jh ;tib 2extic 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 with a maximum h*p)m/ dhpik f)e:p+ j$emf$ 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*qe -)boosi (d. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. T -.b5b5oe q dkzquz/g n8s/xw7he motor operates on 120 V AC, and wh/ksb- . e db/gwxo5uzq8z75 nqen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 4.jv +b;hzgc4vx 1ytzW is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cuzx;vzyc4b+tv1 h4 jg. rrent?

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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 powefjc ltf /:q;,jr supply. The operating current is 1.0 A at full speqjct/ f,;f jl:ed. 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 f3gk3,kkc/l +d4 mis.7d wgot connected to a 24-V power supply. The operating current is 1gd 4sdkl,3k im+/ k7.ctw3go f.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 is needed tozil uwini*th: +6mf-+ 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 transforme , 7ch71hkzhmlrmc upp/9 li7+r causes 14 A to flow in the secondary. How many turns are in the secondakpumhh r/7lpi,+7c19z l 7mchry?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V se(zi7 5cr7btapcondary has 100 tur(75cpbi rz 7tans?

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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 h)km qxi-ql6l 424 mnssecondary coil. If the current in the secondary is 3.0 x 6li 4) -h4mlmkq2qsnA, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiencysb-kt.57pi0rt 3qy ad, how mantasp03bktd5y 7q- r.iy 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 nesc,mpmp+j8 fok.n:3g:mg n9n on sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primarnpgkonm 83+j,mc fp9n:: s .gmy 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 biysi80 uhi ux5523qmcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the 585m iu0xi2q3u y bsihprimary, 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 da3z 1nz(ly6u primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is z16nldyaz( 3 uapplied 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 seco-owdggh wfa34 30. dd-pgxhx.ndary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secoa- hpggow3d.whd-xg340 f.xdndary 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 it6 mpof v9x j33xwj( 3n:cxio-4o(qntu s secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output3p-6xx3v:f3i9m (quonjtnc ( 4oj wox 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 ne(+q 7v) 9,a0)dpiunikjm kxsecondary has 200 turns. If the power input to the primary isi 0udv,( a7mikn) x+n9kjq)pe 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 Aaqgbz2 7 t2n0i5 rqt.l 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 number of turns in2nzqli0q .7 arg5tt b2 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 12vzc;yl* ) 11wfgzec z .;r8lvx0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powe8.l rcxv1wgy* lze;zv fc)z ;1r 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 603azz/otkn58 z07u h hm0hpg5by6 3mjw 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. Findhg 0 kh b/6wmumzh5zy on5t7 p8ja0z33 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. A.yfyp) q+ zim/ generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy woup. m)/qz+fiy yld 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. 0 /gy)k4ypxwdk -r;p5g2q0z y1 p/xcso se8ab 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 thexezxkkp qo4wra0y1 /c;)-pbyps0/yds2g g85 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 10*xlzrf v*t sv/c3lv( i i61wjgzn70;g00 V. How much less power would be lost if the power were transmi1gg7rtci6*(* ; wvs vlxfvl/ni 03zzjtted 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 A. It is to be tranp *cn/ijnuamez6d13r a m.5s27uka 8 vsmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the pow v sa2pr k*mzj8u6c7i/5an3dean .mu1er 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 energy is stored in tn .txkebc:9 -ahe coil's: nkeb t.ax-c9 magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H ic/ /fa-rc 1b b* fxorcgw./3tdnductor. What is this circuit's time constant?/tdx f*/ 3/r- rwaco cbgbc.1f

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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 tba ui0jr. ,:makbe1 -bhe 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?,wvvu8kf/d h dwd6f2ph6* oy6

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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. Whu*jijxdjt,os* s zm729e8 (lnat is the resistance of the lan2js,d io mjuj*e lsz(7xt 89*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 connected to a 120-V ac power supply. What is )5pev r c(+w.bp*q orothe peak current throug)p ( .ovbr*+owec5rqph the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dissa0dwg ut6c*4v isz57 sipated in the resistow75vz6 ig4*tcsd0s au r?

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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 resistor is );h g/k pqfj2s$I = 0.80 \sin (240 t)$. 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 rt4/o9kxfx 3hel9fs+ pesistor 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 resia 231/e9f4 llulc2y9ucmf8 gsq 3gdp cstor 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 inductq+-fhjhe+a;vcqe(8g+/ zvxe or 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 re**v6 75svusz vn3askf tu4t ,rli7c+p-lrr3vactance 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 will a 14.0-mH coil have 14.0 W of vj dv2:f 3jjf9inductive 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 reactance at a)78zl tfyf p1xe.+kc 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-; jzkncf;e:czh8y 96z gk :ms when 120 V AC at a frequency of 20 kHz is applk;:g ck6z8zzm fh:-;ncjse9yied 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 du x ne.c6.a)gqce to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 ef ;k63z okkh:kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactancx ii,+veu(nv,(px *zo e at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance o e,m vb*s rr4rty) eq0ga+8jk8f 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 capacite ka )85qh9bjcor be 100 W? keba q95)jh8c

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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 t ( ;rtl34mehjjhrough a 0.0010-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 series circuit with 12.0 W resistance, 15.0 W e2tkycvqkkj9 8q7 .+j ind+9q kqke2.vkc jt78 yjuctive reactance, and 10.0 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 impb;w h i *hn-ovs4-bdd2edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec-sb w 24d -nvh*obhdi;ted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coi z trs,15) 7xhog.c*p: n-iocv mcwg8xl, and 1.0-mF capacitor are conntgxc im)v,wn8*-c. x:r 75 opcog1s zhected 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 conn8mz o( j 3r2hobcz6. lq4n(rnzfr nwf1 ;;-jyiected in series with a 20-mH inductor, what is the impedance awo.n l r;y qri-z ((zjrno1 32fb;zmhf nj846ct 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 se ,mx bt2x;to*lries with a 20-mH inductor, what is the phaseb*xo,xt 2mlt; angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 11w2n/ hrl-xsb .0-mF capacitor for-s bwnl rh/1x2 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 seriesgz st k8 d1px(8gz2/ha with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz? 81tza28/ xg(dkgzh sp

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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 y- 1etrgy/ty8series with a 450-mH inductor at 5000 Hz for a total impeye8/1g - tyrytdance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz h+d4s, z dosts2jl(:bfor a total impedance of 150 sl(h4s2s +jdtd :z,bokW?

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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 capaciafr3 d.2 ktw 9o, b:/8jzr4nocqgfb.etor. What is the impedz t9:kq2. o /.ce84,3gnrfrbjodf bwaance 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 serie-+0/ng ch) wo afy ej1uezov1u0(x9oss with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 o c)ueo0o9z0 gu( n1ehyafs/wxj-+v 1W?

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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 1ne 9 pzyqs2*(h0-mF capacitor at 1.0 kHz for a phases9e*p2 hynz q( angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kH md:hve5kvsjjl 8va88g 7r+k1z for a total impedance o +vk:jlema5kvj87 81srdgv8 h f 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 100g6flxta ) q8+z-mF capacitor at 120 Hz. What is the phase anlxa)z g+t8f q6gle?

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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 coi+/ou5p d4x3rqg lxs4w kxjt , 4tkk7e3l, and 1.0-mF capacit3kl4get7j3qw4dto 5pkuxkr x /,+xs4 or are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit c 3uk: ) ja1y83lvclbyjonsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H induc lb:)yj8v3alkc1 j 3uytor. 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 capaci qvg e)j -b1zu69o1.mzjxt+uf2nbp/ ctor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sour)-fqc2b/jej pn1ux m9 6 v.bzugo1zt+ce. 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 s ;d.xq l5po2g4r1x rtheries RLC circuit containing a 50-W resistor, a 10-mF capacitor, 42o .; x pdrtg1qr5hlxand 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 necessaprq ) gwcn/3z aa7m.o8ry in series with a 500-W resistor for a phase angle oa8.q)/ n rcgow7a3mzp f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 2y, id7ppl0hm2y .2 inp00-mH, C = 10.0 mF. At what frequency should the circuit be drive7 p,2l0.2hypimpidn yn 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 cijrj /8b;e gvn1rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive 8/b gjvj;n1er 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 circu6.:w sc,m ,cdhcth2ga 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 resistance of 30 W. What isd1bnj mv 6 l :();pxzitv5ck7n the v)5k7inl1 :6d xjn;bcv(mpt z 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 factor for a series RLC circuit conta iyrryqvcurs 6r4i /+;us .+.zining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppluvir6 s4rc.iyzrur. qy / ;++sy?

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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 n+fr4rcy 84xs1.0-mF capacitor and a 15-mH coil in series?+8n4fxrsyc 4 r

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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 inpb3 pav wiv)+9 texom yk3;/ 8szf(4lh series with a 4.7-mF capacitor for a resonant frequency of 10 kvymeh9zp8;kboa(/ vs lx 3+ fwi34t) pHz?

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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 indnp5n24 an)yvp zz*+rvt1 *fwcuctor for a resonant frequ *r2n )fcv45 nz1zpyp vwa+tn*ency 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 must7o ;tv5 cyyv 3)4y*7 wgas/agbpfgn doo821yh be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit i; 8 g/dosb21 g7h vyvfyw t3yay o)n5gc4*7opas to be 1000 Hz?

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