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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 w si1nvv+ vvz)3*ik *qflux 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 induj*zloh4c1 5t2xc6 x f0lt0vrmnges1 - ction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops off3r5zv4rv.i 1pbn 8a h wire in a coil produces what kind of change on the vi3v45 8. p fabhnrzr1induced $emf$, 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 fie hb+doh; ;sn+7sads7t4sq ( hmld through a loop of wire produces what kind o s4 d+m+d7t hnsq;a 7s;h(bshof 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 what q ow:s4tkysp y:z vy2,g;xt76 kind of change on the inducy6,:7 tgqs osy2w;txp k4zy :ved $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic ) hetnk22bi9zzrk*u-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 induce+yivst 4-.nzad current in a conductor will be that which tends to prov+ .y ta4szni-duce 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 igwvj.3,6 t5qebev8 sis held above its center with its north pole pointing down. The stationary magnet induces 5 w, 8vte3v j.qsgi6be(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 tablf.cn ujgn)8b*e. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from 8.)u*jn cfbngabove)

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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 magnetic fie6h )5tbc13tq 1lye fbdi vr72fld vector points straight up. The magnetic field vanishes suddenly. When viewed from above,qt 7cebb5hr1fd 6t 3yil)f2 v1 what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field veqsa2b8,1m lxdctor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the ind dqmb8,x21ls auced 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 ::mk7td-tyvdw1 f(v f field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direck:1dft (-fw:m7vv ydttion 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-increasing c mhtbe0o73 *jzurrent northward. Two coils of wire lie flat on the table, one on either sid0h * 3eobjmt7ze 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 entering fi5 3x. zij -ay7ao ng5srl5.qxgb4dr) irst. As the 7yrxdz-5j4 ).x5qsnr 3agi5 l.bo aginorth pole enters 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 wire is rotated at constant angular sp tqqrxfh(if )dl (b l-prv 9ph/,fg--8eed about an axis whose direction can be vhl-t -h()r(/ qdb ripqff8gl-p, xf9varied. 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,aaon0)ct c8y stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wacnt0cy, o8a) hat 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. d zjj63rm3 lzwxg9.4i
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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 that a.z p0u6 osn6dmcn-,pg n $emf$ 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 d 4sws/2lkuz ) 49cgrtk/km 1,t2el mhmagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directio+w ,p-jn duhf1n) is moved northward at constant velocity through a magnetic field that points straightw-dpjh, n+ 1uf down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant an3tj:ovc y wf y8ctu08*gular 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 bjrgsruo/c9 :.ebc/ /transforms

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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 revcd+a tbtw/-u8. ui- jaolutions each second. The frequency of thet/ac-iau-jut + b wd.8 $emf$ 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 deva5rnefau6mth :mnm4olb8g; s.ji820ice 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 d,ep1ptdb+4 d6x czjds;q pq;9evice 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 morebzwd:z rad(u4, oh;jp-cn9*e loops than the primary coi-b; *urddoh(j z 9aew4 c,:npzl then 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 contain 3y3w qe1/toe;ob 9qfes more loops than the secondary coil thee ;o wq9oy3btqfe 31/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 pmtp*gr u2 vp hsh;8m :51wnupan 9-gy8ower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci7/qb,yqkna 49me zn v0rcuit,

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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 idesis9n.: cjc7ioqn9xp 9+ks:d qw7e a 7al battery of constant terminal voltage. At the moment contacp7 9x9:sj7s qw7do.+9nq kice in :asct is made 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 indue6vcjf* j cx64ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the baj*c6 exjvf4c 6ttery, 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) x;ngr7*r ryj 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 inductzfbg5n-h mu.)5em /o nance 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 to a battery. The tca6kv) +11b 2xa f /qmaekfgm1ime constant for the circuit represents the time require1kv /a2 afqfbmg61e)1 km ax+cd 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. Th ghv l/8x)ln(ve ;u5yhe battery is suddenly removed l nv/ 5)xhhy8u(;lvge from the circuit. The time constant 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 following hav2+6xt f8 zou5vsvi ld3e 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 pow/:pf 7jlpr1j*itdp ) per supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. I bo(s ri:9(w9t )avycrn this circuit, the current9w sryc(orta)vi (:9b

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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 by9i9in1qff u m0 what factor when the frequency is trip1 f99i0imfu qnled?

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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 acrossvalss3v4 v . q)sjac.: an inductor is doubled, the inductive react.v4 ac. ssjv3)qvl:a sance of 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 vy xfk; 59;*rj lbzqs33 +gzsuAC voltage across an inductor approaches zero, the inductive reactance of that coilgvjksl3 r5u*bzy ;x ;fq9zs3 +

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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 suppj9d;tqsn/ w :*ijxq 2gly. In this circuit, the currenqsj ix2:/;gdqj9*n w tt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance -k rnlab;xob3ge)0 c*in an ac circuit changes by what factor when the frequency is tri*lbeo3xb c)n; gr0k-apled?

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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 acros*tibp wf*z;ck , (,i(mfeb +cfs a capacitor approaches zero, the capacitivefw b,btfi;i*c(p,+e f*m (k zc reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and cau 8u.06ayz ns iuss1wnb t97:npacitor in a RLC series cis0.nw91:a8 u s bntz7uisn6yu rcuit?

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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 as w*c -6,yrpzbq$\cos M = R/Z$, 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 circu arp;,ge(9lnz i qwl+.it increases if R increases. When is this statemel np(;wrl zi,9eqa g.+nt 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 r jaep b. 0,b:,f/gqe,zmzl6 lha(m)uimpedance of 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 the circui vl1d( -he7tkgt 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 t zu5d;zs whnnvxdt x;1r ,s/ 0*ix,7xlhe capacitance both double in an LRC series circuit, the resonant frequency of thxtw ;1n*ns z,xuxhsi, ;/z0dd xv5lr7at 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 vokbq s 6(cpu7py6tub+9ltage. 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 oz -z* j:1qa8qz vzazb.ccurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a univulworj r;*hx icc2 w nlh4j86 .jb2*67a h5fcform magnetic field of 0.20 T. Find the magnetic flux through thejh*;6vlc28j xn5 67*a.rr hhbl4 f wo2wujcci 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 is rotating in a uniform mag/g*7fi i 0 a7jhfv9:0lxrff,bg .lde snetic field of 0.20 T. Fffv7lgrh edj bi07ls*fi0g,/. fa x:9ind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnejihio,9u o ..ktic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thu.hki ,. oji9oe 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 ay9y3v 9j5nqa fs+wo 2zn adjustable 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 coil changes f- 9f;xnr ikx+yrom $4.0 \times 10^{-5} \; Wb$ 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 2:(o)ja .lwi .kt oi 9lz6g-mme00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, findlim9 :.taoi)6(km- loj z.gwe 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 wit z 7xp0/c. dak56pb;w.qtxapq0f;q exh 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 az d+rt73 lljgn64p,dgnd 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 wd v cocl(w/z(+ing span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field /(c vcz(dw +olis $6.0 \times 10^{-5} \; T$. 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 angular v * sl)3 kzwqheq7*wqv.hfpq44 elocity of 2.0 rad/s about a vertical axis through one of its ends while in a cokqv7q w hqpe hq3*.zs*fl4w)4 nstant 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 loopsar5):j wjeqsxkuqeg gg 19 t 97hu*+7c and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire 3kso,5 dcdo9 -1t3cxka yj:pm 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 rectangu fz;./ ncps)kflar loops on its armature. 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 axifc);kfsp n.z/s of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of w p4 3s6yzdu:vmire 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 construct507q q4xvfzqt a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area ofq0vfq7z q5t4x 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 gl9i/h;0r.(cu,zmyx i e u.ncnxj kqe w4(p/4henerator with 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 ln1x 766jrg5-c muihd 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Th l(ekl+ bcx3q66 4metc2)zhtwwl6t d4e motor operates on 120 V AC, and when rcewqz4b4ed x+thw6(2mlt tc66k 3ll)unning 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 W is connected to a 24-V power supply. Th 6yi:wexhk bb,8h2 vv:.j xr8te operating current is 1.0 A. kx 82erbi v:.t v6:jhh,bx8 ywWhat 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 6ks7m +jp2njlkbq;k . is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thlb+q j.j; km6 2spkkn7e 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 pll.dvc3gm s+4w sg)6ply. The operatingslc4m spwg3 )lgvd.+6 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 needed to reduce a primary vmcv.hzq5+d cd-p dkw23(tn ;h j 6im6zoltage 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 f3-fyp l+n ul;kyr dk5 /:1ntiilow in the secondary. How many turn1p:ykk 5d lfr/3n;iil t-yun +s 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 )cd eim iz3mpwh2py0l4 (a .g824-V secondary has 100 tur83)gp2y4ic ze.iw plh(a 0 dmmns?

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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 5fh: o qvo*2t7z00-turn primary coil and a 2000-turn secondary coil. If the current in theo7t2hqfo :z *v secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumingc7hpct ,; r+ys 100% efficiency, how many amps at 24 V can flow in ht 7+;cyc,prs 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 transformer provides 7tup*yw71 ,cm;b 2io gei(oa b lsq3h,3500 V at 10.0 mA. The primary coil opera*iuy ,23b w;,(lbaeth371spi cg qoomtes on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primvieprq5eah7l s)e/ oi77 pu4.ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apprs7 oi /e)qephupi v4. 57e7allied 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 turnso5en3. zht:ij x2amo, on its primary coil and 300 turns on its secondary coil. If 120 Ve: t,nmzh.jox i5oa 23 at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tx8qb ft bf-2tvbvorg() swa*33 *u )eaurns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect awb e33 vr-u8fqo)*2)fbv *x(batg stthe 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 secondarpi-3108v lodjpmnu(rjw1 b9 v y has 200 turns. If the input voltage to the primary is 100 V, we9-p83l(jd viowbp mj011vnur can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ha lttk,0(ipau-ap9dg ;cop/qdbg:f,3s 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary a( bd a/qpc ,lut0f: 3,9pkg dto;gi-pto 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 -hn. hk(.he(h1fe vsn 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 o (s.-1neehhv(n kfh .hf 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 aomkihmq2+a (; t 120 V. The voltage is usually stepped up to 4500 V by a trah+qmi(ak;mo2 nsformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current b mssao9 76/wzat 120 V. The voltage is usually stepped up to 4500 V by a transfora6/o 9wzmsb7s mer 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 v 8xtk 7hezq7y7)s:*rx /nzk ftotal 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 original energy would be lost if the transformer were nofyzk7r8n7 exq7k*ts/ v)xh:z t used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gz 7mh f6+xbuv.fh+u,yenerator 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 is lost when t+xuvu yzf6, h7f+bm. hhe transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power aom rji0sc,+kx. zu,(would be lost if the power u,+smzr.j (io,axc0k were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitteofjcq55/4/a e ks kjv*0)gtfzd on a line with resistance 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 to4* /v sjzfa0tj oqcke5)f5g/k 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 mym9.scsp rf6 a -w28+mvwaz2xa ).bv much energy is stored in the coilvybxmw 2vsw+8zsfa..a2mc- 9 6r apm)'s 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 andzb-m0kvvzy; u8y ;3kjn8/ gex an 18-H inductor. What is this circuit's ti8 z; m08 bkvyx3n;kgjzy/ev- ume constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the 6 :fcckn2-9 4n1mre yrrpq4rbrms 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 aav06w6vqw4 qrh u/n9outlet. 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. ko/ i5t,ulwyu 54qd+irb.g/p What is the resistance of the lamprlk /bpiguti55o./ uydq4 w ,+?

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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 a:i8o40pe c 2zof6kl1hdd+tvis the peak current through the oadte0hc+8o4vpzlifk 6: d21 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 powk5d . *gja4y)ybnijtlx+w 3ha zuc:,6er supply. What is the power dissipated in the resiwauy6g3b)n,4kyj5jhl :xzdi ac* + .tstor?

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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 o4jyf805ltoqktmy o 8q gl 4ft15sca7(9tz)xis $I = 0.80 \sin (240 t)$. 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-W4,-2h; 9wm nwyvgarhly*.llv resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iw9qtu8(jg) l )awyxw8*vx5 jy s $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor a)w56 m1+wkru b xoys1at 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 reactacx/lb( 0 yxra7nce 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 khh*mh 3yy8/2 p.qr(ovu.mxj -mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of i mpxahkua6yi3ll 4og5- 11k y9nductive 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 9b l,uamf2, ixa,hp4c zt nz,1inductor when 120 V AC at a frequency of 20 kHz is applied to it?mh4l2i,, z f1xncz,,atb9a p u

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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 10ci f- erupk e;nh*c;kfz. +/a10-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 reacw ubfhj)5 t*-ri 3y/9i*uwnq v4fu(de tance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is nel.gq8k5ute5+rz-e wzb 1t 7 sueded 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-m/1w.* kv skqfgF capacitor 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 reactance of a 0.010-mF calm2yio ys1k bcr68lzr(3j60opacitor be 100 Wroc ks02 izby(ljr 166l3 om8y?

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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-mFm6gl1nmj x9yeb0 4ni : 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 *)ma9 hxn) k /vam+bklalp8.minductive reacmha*+mm/8 9.) v)balalxk knptance, 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 impedance atb(qs)z2w cfu*,k, bbay )6fa.al 9bkb 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected qy, )96f* ,wf2skbb) bb.( caulazb akin 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 150g e. o x7;e(dvvog-8et0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec8td- vgo7o egxeev;(. ted 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 bo0 )cw udi;nbxo8.pt-cl :-o20-mH inductor, what is the impedance at 1 .-ilxt)0w d: 8-unopc;boocb000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is t)8tjy1j ma, f/mlud,ghe pylmau ,8gd),j/f m1tj hase 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)qzz+w(fu,, m kvrjs + 20-mH coil and 1.0-mF capacitor for a total impedance of 1 z,murvwz +q,j) k(fs+00 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 capacit7g9.( gfmvherqj ;uk,3. zqxc ances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 11ezguq,3;ckq gh vxj . .(f9r7m0 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: q gboy; p057hrm;qkd with a 450-mH inductor at 5000 Hz for a total impgmopyq: r;h50b7; dq kedance 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 sedg4f9cp ip3x/:h 5lx gries with a 100-kW resistor at 1.0-MHz for a total impedance of 1 :hix3x9pgl/4gpc fd550 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 9zw6 )yraihzd 4fwac6uv3e, 8is the imped urzd69wv hw,6438ce z)ifyaaance 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 wi2y+px/rs sxars59o* pth a 10-mF capacitor at 1.0 kHz for a total impedan9* x+xao s52 prpsry/sce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed ip +/jc yi7m kkate5h8)frs /q.n series with a 10-mF capacitor at 1.0 kHz for a phase angle os8myet/.q7rphf)k j5i / + ckaf $40^{\circ}$?

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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 zxr3:4pdv*v h wi)bj3with a 30-W resistor at 1.0 kHz for a total impedance of 3:j i vz*3bv)hdx4w rp45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor ats 28,mpw uq6sr 120 Hz. What is the phase aq 82uprs6sw, mngle?

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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 w 6 n4akydc6(eresistor, 20-mH coil, and 1.0-mF capacitor are connected in seri yc66k4ne (wades?

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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, andbp+7v8 .lsrywq90 jj g a 0.350-H inductor. The circuit is connected to j gqrlysj v80 .pb+7w9a 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 inductoi s ,az7tn:js:(ogk8or of inductive reactance 30 W are connected in series to a 110-V, 60-Hz poweosao:i(7: ,stn k j8gzr source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W r9cue8ra6lm+ ql:kz+xesistor, a 10-mF capacitor, and a 0.45-H inductor, when con +l+amc 6kzrl9e8x:qu nected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in seg fdo1sh9e bdq0kc7/ 4ries with a 500-W resistor for a phase angle of qgo0db e7s 1kfd9c4/h$40^{\circ}$ 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 rjwlb(wuhs )n; ::rx+has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum:wh:nu()x rw +;lsbjr 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 se)vs .cpg()7 qyq3aim1 .tvfngries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to )ggf( q1 )7ytcn smai v.q3p.va 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 cifex6( qi( l4cb :nnzym:mqb 0a5d2kt3rcuit 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 : r06i7em2eb zu w+nbnof 60 W and a resistance of 30 W. What is t0i2 6b:e+ 7wbne urznmhe 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 fzyz,fd uay5 37or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, auf yzyd73,z5and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacit ovs/8bt 1fne2or and a 15-mH coil in series?v/1o28 eft bns

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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 s:cyr*z3a slzk/,gx5xl 9 lt+neries with a 4.7-mF capacitor for a resonant frequency of 1a5txr9z ,/yc+3*ll sxngzk:l0 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 rbw9+e 0hwa qrav ;hu,5wstq8:wtks2k1 j5u3a 3.7-mH inductor for a resonant frequency of 1000 t juthwrw w5,0q s k rs2va85weq9b;a1: k3+huHz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a -rf+ g3ff vcb+ w1fi5k5t bfs740-mH coil if the resonant frequency of the circuis+wb f-fir17fkc 55gt3f+fb vt is to be 1000 Hz?

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