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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 magneticfnxm gt -pha9-97s9ox 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 state;vgncy nw.61t s 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 lookdy7y 4: y6mccpb;-w /whmy 5ops of wire in a coil produces what kind of change on the indydom; kw6 4 57wmhyyc:c y/b-puced $emf$, 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 ofdea ,9y7xkau/ the magnetic field through a loop of wire produces what kind of change on the in,a/du9ay k 7exduced $emf$, 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 whaw /e:()not+/p c rxz)h jz4ghr:m fnk;t kind of change on the induced fmgjt: o/cn4z)ne(h:p ;+rw hzr /kx) $emf$, 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 frotl /7keorl9b k4h )m;lm 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 wd b zb5.tl47r5w:.sn c.ag4d ,qzelhaill be that which tends to produce b.z5gthbq:.cadsla,4 ez7wnd r . 5l4 which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i*l 65lewg 8u3(1rge 9zvrm*aq6wni cy yux;6w ts center with its north3qu*ru5(i; * lx6ynywwg9zl1 w ev 8m6e6racg pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abb,a-au)kj 3nfuvb+jcrbf .1 0z11ilcove its center with its l1bub1 f+0-)jnbvukaz3fic, a1 r .jcnorth pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnet0m9p3pp p,37 s htm6esqj7czu ic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current h ,mz67spq79spp 0p u3mjt ec3in 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 ego5ll bc;g7wo:xd-ik ;u7g7)0yvm k table top in a region where the magnetic field vector points straight uclulok 5) g;k;-ywged7v i7: o 7bxgm0p. 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 where the magnetic +t9ub1v t3xt f9z)) u8n3dnw6ltspqz,o*kbhfield points straight down. The magnetic field disappears std+)nz8t 1* u6xvp f qt3bskwn)ob99z3,lth uuddenly. When viewed from above, what 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 tabh:eethh vap9,(e.pg le,h71ule and carries an ever-increasing current northward. Two coils of wire lie flat on the table, e( ,u 7a1,:hlphtheh 9.gpe evone 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,* lui2*duxxs loop of wire with the north pole entering first. As the north pole en* uusl*,2ixdxters the wire, the induced 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 wgof/l6nt )n9p ire is rotated at constant angular speed about an axis whose direction can be variedfn9n l6)tpog /. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 con:fye kl:lmi ,*stant angular speed about an axis whose direction ckm f: l*li,:eyan be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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.vh/a* nk0h/ pe .v3utk
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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 tht+ 3yd+aq7xs iat 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 field.zkug/r/a1,)nouh)c v2iqxj 4 f:s h c7 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 (oriented2tbr+ t8gaj8wy.e8v 9nb/9 pc1n woif in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemew eoa9 v189i+ngf8tprn.2j cbwb8 /tynt 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 ayjpr4d6 jv c ;)pb/ f jdvjdm5,8fi+w7t 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 transaregj.5:lij du0x-5 yforms

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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. The frequenck68 z4(aon l ,tusj2vty of tlv( , ztnk6sja8 t2uo4he $emf$ 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 dfwc on(+/ v2a l4zw5icevice 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 device thattfj *g vg5( oq4gyft2 (o-5ms0 +zrjxk

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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 cowb1winq(pg /f* n-+npil contains more loops than the primary coil then +n- 1/iqnnb *pfw (gwpit is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than ty0t ) 8orh-umthe secondary coil t0)8o-htrumyt hen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpjq,x. yymrq / (55hsd74pi rlrut

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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 circuitpge/h u7 j6lk4,

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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 an ideal battery of constaes6j x.z;kg +rrjs:wdgwq0,d,1kb z 4nt terminal voltage. At the moment contact is mj+e04s dzwksrj6b,.z;1xwrdqg, :k gade with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to vmmtaf;* , jhfb)a.l5 an ideal battery of consta mf v*5bj.m,ha);talfnt terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L azwk 9:jlxv6p9di il( v1 xt/umuv: 2h4nd 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 kz.c9n gwa- gd6/j5ug;mg9k ban $emf$. 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 connectedcg2xrrtf m8 c;q94(x qp0xrh2 in series to a battery. The time constant for the circuit xx8q qt2x rhc92c4r 0 frm;g(prepresents 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 s1:d3ah)2 rvvb9sysk veries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circub39 kv)1vd: hy2vssrait represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitsx a13ym.*a,dur nml2q+2y jta 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 thi +uh4pisi )ezapbt4s 2o 2a6bne1z,7 js circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an 1y)rh.xs g( gszr, d; rss:gb4AC power supply. In this circuit, the currenrsbsyz rs.)( ;g1:g4hsd rx g,t

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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 factor when the freqnow aa1r:; q2tuency is tri;:1 tnowa2 raqpled?

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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 ia-p-qa rfr)e a2xp1slu4so77 s doubled, the inductive reactance of that i 7sru fx)2a ppsqe4r1l-7aoa-nductor

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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 in1jlk) :om+ j m 87dmwkf.*vlguductor approaches zero, the inductive reac l*oj. fkm:wugv l8) m1k+mj7dtance 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 power supply. In this circuit,xs*yk* p f4iy9 the currentkyp4*xi9f s*y

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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 whb(ab l0-opy5s ha :i(dat factor when the frequency is trydblho(aa5:b-i( s 0pipled?

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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 vokpwa3l cx1 8e-ltage across a capacitor approaches zero, the capacitive reactance of that capaccp8 k1l w3a-exitor

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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 uft. w9pw+ n)abetween the voltages of the inductor and capacitor in a RLC uw)9tpwfn a.+ series 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 defl*om34f1u zpwza7qn3x-e f u 8ined 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 circug(qx/e ,g.n 5dehm: bfit increases if R increases. When is thi,m b5gdg.hee:n( qxf /s 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 i2x l sodbr 2ijg7*j vw.7rw v+yj0-e*xncreases 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 the circuit increases if w/a:q8i4 xx(fbgxb c(;jg+nu$X_C$ 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 double in an LRC su xw e4.:h2ueyeries circuit, the resonant frequency of that cix u24.:h weyuercuit 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;axy7e; vul4e 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 circuit occur/2*jb. jstoh;hknj 7 os 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 ra-imjddksj ,r,r x.2kx6g )1wi dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi,1r,w xj 2m kx.kg)r- 6ddisjield 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 0.10lrq/,1 hmo2byhg -vqy4x5s d7 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fy71 hdqbsxo rh4y-v /52lg, mqield vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnev7sw+ 1rk+ o5i0i1rp71erpyi t-h fqrtic field of 0.20 T. Find the marsrr5o7w +1ifv qt+-1p7e p rhi0y1kignetic 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 adju(b*df* cnd ;swstable single 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 coid2 e(eebd2wa67dr8z h l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squareu- q +2 2jv(cegznmp)3cwlq)ubmuz 7. frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unz )qvz ucbu.2w +lc-27 p em(m3)jqugniformly 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 withc8e sy7nniu .. 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;zish x ju1--liz 7pi* 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 of 60 m flies ho9kh6v bco/knp;2+ whcrizontally at a location where the downward component of the Earth's magnetic fienwoc6 2chv ;k +bh/p9kld 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 andg. :hv;,suwik t m;1xgular velocity of 2.0 rad/s ms xgu:dh;vk; w 1t.i,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-s0d1gk nib8( p hw;vc5 p-kjw*aectional 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 tu fs ;gi(1mu :0uv0iitnrns 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 $emf$.

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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. Eachsb8on4pf d-g . loop is 12 cm long and 8 cm wide. The ars. of8 4np-gdbmature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of 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 turn-ny+h6kgdl3t;jwq 3+e;4hzd*fo m f cs 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 generator with an iz:v9*tqc:fj y 1aim2output of 12 V maximum when rotated at 60 Hz. z9ciyaqivt* 1m::f 2 j A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator widg6x3;w/yxv tth a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opeq ke tk+41d qbnks; dzo/k6:q,rates 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 r03 e6u bf9i/yjh+o acih9gq0zesistance of 6.00 W. The motor operates on 120 V AC, and whei6y0jci3zbq9h 9uao0he/ fg + n 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 ret r1ba: cj-p7xtr/pwpz/b +h+sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A p-7+p r:x+/ajzrtbc w1b/pth. 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 powe6nia+,axc 0 dyr supply. The opeaandx yc ,06i+rating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sup eq*n;id)r*v/uiu9viply. The operatin u9*v;iidr *n/vq)ei ug 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 is-bih6/ qh p2agrb0du5 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 causes 14 A to flow in the second/g6*/yjw 9,oc 7tjzvg tn qn6vary. How many turngwjn t6/gq*cty/j7,9zo n 6vvs 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 necessary in a 110-V primary if the 24-V +.jb jpkuezrp ) o/s11-v x8vbsecondary has 100 sep j .1rp+ vukvz-/j1b) bo8xturns?

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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 200o q(orb l 8yr*2 (zr 4bby*vpw*/vywc30-turn secondary coil. If the current in therwoyz (4/b8(wq py* c*lvb2vbyr*o 3r 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 i2p1dye jy6o o:n the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconopje1 62dyo :ydary?

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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 sig 4qi3t q: wdchs*lpnva5no*;uz;v v */n transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 * v lo*iuwv;3nqnc :pqs4vz/ d;at5h* V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secolw- mjq vp*7e0ndary coil. If 120 V at 2.0 A is applied to the wjp- e0ml7q* vprimary, 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 is8wf +.jsbg*u e0 xkq0ts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whgu 0s+x ewj.s*0f8kqbat 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 turns. If : 0- xypzek*h3ggx x3pthe input current at the primary ish g-x xx ezp03pgk:3y* 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se mj7x6 t4u9pcrcondary has 200 turns. If the input voltage to the primary is 100 V, we can expect pjtcrm 9ux647the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tujc6c q4fp4a xzsu.9np *1zvz8rns and its secondary has 200 turns. If thz9p z.sa8cc41qnf xz 46*pvjue 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 osjg )t nxa7 ap 0.hey./gm4c:yf current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total40yym7 jpe)hn .tx:ag/c.a sg 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 655t 5 ;uehq49fsk7v7gyypk b w0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perceyu59gtqk v fy 57hw b7p45;sekntage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe*sgx/(r i3te. u) ggdjd up to 4500 V by a transfo x.rg3*(t)egugd/ ijsrmer and transmitted through 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 to-4 woncaa2 v0:hh *iietal 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 of the origwan hcva04o-:i h i2e*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 lag6 jl0/+mk pyine 50 km 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 steppe/ 0a+ 6ykgjmpld 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 1000cu:( f j6xqhxg8 (9w fs ug0:4q2asgve V. How much less power would be lost if the power were transmitted at 3000 V instead of a a20xgc (xse4v quw(g98jfq :f u6shg:t 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 transmz -of* rf4ru,(,pajboitted on a line with resistance of 0.60 W. To what voltage must the generator output b,rr(*zaj-4,fo pfou 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. How7vc g2nd 0/.+w tfeudw much energy is stored in the coil's magnetic +w/n0w2df7vuc dt eg.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 kjs95cn. fxk1x+1hgs, k(kg njnc ,6rand an 18-H inductor. What is this circuit's thf1. rn s9jxk1g +kxsk,6gc(n c,jnk5ime 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*g;) 9bewq6 rimzbpmrj9 k -q5 in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120--d+iu. mespt4qua +- qV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the m2trqe u)-lo-lampu rqlmt--2)eo?

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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. Wha;fre2u f gd5c*t is the peak current through the res;5ce2fdfgu r* istor?

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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 conn2 xb/8e rg3mvrvhw2p)r bd3 ,qected to a 120-V ac power supply. What is the power dissipated in tvp3b)r,exg22dv 3 r8 m/bwrqh he 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 resisto (wm//y7:5.ifxy .cw szn0lww+bop tn r 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 resiyoysidj - ni03fjx,0ft+ w5e/stor 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-q0m iiqv; izb8jip+5x /lc)a;W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH indki 6xk vd)c(z5p-k 2;895 drrktnwzmt7q 1qsjuctor 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 inductivbf )s sm+t ewcr(u)-w30jyw)n e reactance 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 inductive reactance?a sp d6ct6y6cawg+/ ;g9eip p/ik,:qj

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nece-tewtbh m.w j+;dd)a; 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-myh w0 n2tlj2: iz20 dguw1d.snH inductor when 120 V AC at a frequency of 20 kHz is applied tw.dn 0s 2hwt ilnudgy2z201j: o 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-V, 60.q-u78cb7h n0ekmj eh)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 q-u1,w:hxxhe 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 of8j riow 1zl 2j7+bl2ke 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 capacitiqwe8mb9 r osjzp(./s:- o 9uqor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive retxt7v:laztp 5v+ +c,v;+7nsh59fbdyp sg4l mactance of a 0.010-mF capacitor be 100 W:vxca;ztd s4+ gt+shm7+yfln7pt5b v,p 9 vl5?

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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 caprb gq7s+z2 u)qacitor 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 resmj-bdv0d*yz1z b l+4e istance, 15.0 W inductive reactance, and 10.0 W capacitive read*j-+z0e4my bb ldz v1ctance?

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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-W resistor, 20-mkp-s td0gwmdr4 3bi6 :f,+suqH coil, and 1.0-mF capacitor ari6 ugt- p,4b3sf ms+wq:ddrk0e connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a r e,wk7.isa e.oit4 m1100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectemk7,e.4r .ia1oseitw d 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 series with a 20-mHab 2:eqw81jetyzo+ n2 inductor, what is the iz+ te2wnoa b2y qe:1j8mpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with 4m*4* .dpv9z yi sjklxa 20-mH inductor, what is the phase angle atysl m*9jk* p 4vzi4.dx 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 1.0-mF(g0it .yk) n iysow5m, capacitor for a total impedance of 100 W at 1500 ti0 5o(m,wyn. ) gkysiHz?

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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 serd8vd od1v .lpek8-k.l ies with a 100-W resistor and 15-mH coil to get a total v88dlvkod1-.k.e pdl 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 inductor at k ox fszoz3 )tiko8*m/e3k cz) /e.bs+5000 Hz for a total impedancezz/cf/. 3+tioekks3 )b *okzsm8 )xeo 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 6z (hrs21hc; jy*vu eufor a total impedance o(6 e2s cru*1h;yuvjhzf 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the 32p(v y-duh5vr: cocjimpedah5vu 2po 3r-cc(: djvynce 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 t56 7g m lyitvg/x7lc7with a 10-mF capacitor at 1.0 kHz for a total impedance of m7g5 vlg67 7yt ictx/l45 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 10y6 z(.vrw;y:a*t lkwx -mF capacitor at 1.0 kHz for a phase angla 6lkry zy vt:wx*w.;(e 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 h-is( 9l8)orl+splcckHz for a total impe+so s)-l ( lhip9clcr8dance 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 ipsa tj(-(uqk5 n series with a 100-mF capacitor at 120 Hz. What is the phase anuk(t qsjp5- a(gle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, an dp):kr+wj- yvje (wp0d 1.0-mF capacitor are conned y(r wjv:+j0kp-we)pcted 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 consists of a 100-W res( r+j)kt2 o5n gjdmfabm++y8 pistor, a 10.0-mF capacitor, and a 0.350-H inducpyb+jtadgm o +fk+nm j5)r2(8 tor. 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 capacitor of capacitive reactance 30 W, and an inductohc6 5bryikbz2dh- ( n h;a3zr*r of ind-zd*za;i n2yrk5b 6(rhh3bch uctive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containinusik+.f yl-i :ghoulw8wtb(xg k+2j /34b xe:g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to /+ k bh(ulf.x jokwigg4ex i2+8blwy:t u3s:- 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 nentfxx )t(7ei3 qr2bb1 sz* pu9cessary in series with a 500-W resistor for a phase angle of 7e*zbxq xf1 s 2n)btptir 9u3($40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what fehx ooysl )f/8p2c)4e requency should the circuit be driven in order to have maximum power transferred from the d8ole4/cye)) xf hpo2s riving 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 seriessjd.1 ojp--k j circuit with 12.0 W resistance, 15.0 W inductive reactance, and 1sj-kp1 j.-jdo0.0 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 isxa n6:zt.,nkh $63^{\circ}$. 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 resistancef0v15aotr0uxsf wn;tcq + 0w+ of 30 W. What is the pow f00coauv0 r+t5ww; n q+ts1xfer 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 contaqfeze9t)qd1k(y1 nt mx..a5 (wc( po+hd -xqgining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected+(9pfx .dt deyx aew thqkc(m)oqzqg( n11-.5 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 a 15-mH coil in series(h ,su p1jpbi39e lx-outxia7k )*rf2?k-j7bpxoixite 9lfh sa)*p( r 3,1 2uu

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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 4t),hman gangb- s.;(f.7-mF capacitor for a resonant frequency of 10 kH g;htmnb,)aa-g(.nf sz?

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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 ind v9bhnnaj5.mao8w/ b0 uctor for a resonant frequency w8 h0j5b/a oba.mnnv9 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 a5gy0.z2e th o/2bmq,m e vhfh- 40-mH coil if the resonant freqh0z/tgeqh 2oh b.2v-5m,em fyuency of the circuit is to be 1000 Hz?

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