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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 u39hwao r2 7i)*hg:tkdf em. wsnits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states th8y- o/o1c lwhb4:nqbpat 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 u,jt/, u2zb:s:f upbtloops of wire in a coil produces what kind of change on the indu:u 2b,tut,sbu/pfz:j ced $emf$, 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 /f2 pmsv/sp* m)n c 1jyqcc::4poo3cbau0 fw-field through a loop of wire produces what kind of chcsc: ppmuwbf1v o/3 qsfcnjm- pc/0)y a24o:*ange 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 looi9 ol; c5w:zutp of wire produces what kind of change on the inducecl;5oz t:wui9 d $emf$, 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 fixzojzcy-,md 5gc2w;7 eld 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 conducto gbui/ k(k9fhur7ngp n)6n,( cl5 *fcgr will be that which tends to produce which of the follp n5 g/k)kbnfh 6n7c9cg*ig(ufr ,(ulowing 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 bte5krk7q(-o qn:ju ) war magnet is held above its center with its north pole pointing down. The stationary magnet induces 5:-u tkrn)qoq 7wek j((when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magbgwv:s lf5go6a/s k/4 1z*pyj s*o6tlnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induce/sz 6psa*tgvowby :s okfl41 j5g/l*6s (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 rfvc1 rbs4nd5ui6 ne*g1)uz v2egion where the magnetic field vector points straight up. The magnetic field vanishes isnc 25nfguz*rv )be46v 1u1dsuddenly. When viewed from above, 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 lgn3 orzu 5r:r5+a78efa+jt h jevel table top in a region where the magnetic field vector points straight up. The magnetic field suddenr5 5t:jj3 ro7rue+fahgzna+8 ly 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 fiemlv.2:aba+ nas y9v e;ld points straight down. The magnetic field disappears suddenly. When viewed fro a:.+bnal;vea yv29msm 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 horizont2jqyl: ojeg4 :;lu;tr6dl 2ejal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. 4je6: l erqjl;gl2oy ;d tu:j2When 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 fir tzo6w0 8we5z)quix e, b*wet9st. As the north pole enters the wire, the induced currw ee*8zt9qz6ww t0 uxb, io5e)ent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis9/ 5niuh+ ;h(rfk ftzz 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 rotatfi9t5h(nhrfz+/z ;ku ion if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axi -5wd(7sm7b d.+ vg tt pdebc8nkle4,es whose direction can be varied. In a -4kb g 7ps8e+mdvn7dtwd5 .(lec,etbregion 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.xcy5 t9t4t1 a(jnvfw4
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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 tha 1sj 8ocr2anw rwt)8j8t 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 magneta::pyam0 l+62njfw tgic 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 direction) is move b1,1qg j:07xn:deep i cxgcu7d northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induc1c,jiqge g 0 x:d71b7pen: uxced 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 rotate7q) fvf,v bad.s at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transf-/k btr*k c9fy;g vbpfrk:r(9h0 fag 9orms

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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 the.3;k.nm k vzhrough 60 revolutions each second. The frequency of the ;zk3h. ev nm.k$emf$ 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 devif/ahw 5me8t0pm rfsa(g r/i /-ce 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 thy rx6b7 ed a,w5zoycot5q+;7uat

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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,wmymp 8sj ;4m z p+jvr(6xm r t:6.piccrqq+5 contains more loops than the primary coil.m+twz,+(y6; : m 6jcp mvq xrrcis48pqpjm5r 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 contains more loops than the secondaryzix/b;;r 04kz2 aur- jd,c.grl qi5l q coil then it isb lr .uk-q,i5lj; 4x2q0azzr/ir;gcd 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, thunwl eo6n *hy */7v*thj0xsp9e power 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 cir +.hasa0mi t)j6jn 15qw,wujk cuit,

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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 a8ve d 6 fsc5,qxons,a)re connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the rsv qf8sx,a6 5,do)nec esistor 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 art)x54:vedhho : h2krkr:p: are connected in series to an ideal battery of constant terminal voltage. At the moment contact av5t::okr:d2 rk)4rhh:hxe p 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 gqczl0erog: im0+fcpy2 ,, z/with 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 w89oi0o*dtb x9sn 8y*jln/iwfol2 x0resistance 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 time x2n(7 js*va(25*+x.he3gc irgfeilmtx yx; l constant for the circuit represents the time jyxx2lfex3g. *x+hlnmsic* 5r2veg t( ia(7; 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 are9e ye7gix f73r connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curf r 9e7yixg7e3rent 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 have0tj dnda6b5d2xzuw--;lxz x9 the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. O+a ijac54v2584hho : xw:k t gwsnqeg(n 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. In this circuit, tho*5rn0*cguruyy / xm)e currento *r u0y*runx 5c/myg)

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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 chan4puv6 aum2 3poges by what factor when the frequency is tripluoa3 mp62u 4vped?

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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, the induct;67n 2i easbos8onr8 n:htn7rcdudod h ;x090ive reactance of that ia h0n ohdn;i27bdnst87 6ro8d;9: r co usenx0nductor

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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 indhvsu bv 1*kjs4 4th5cux nf3,0uctor approaches zero, the inductive reactance of thax tn4u3jucvsv*h0fk 4b1s ,h5t 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, the cud8b1eafmaw)jpm b/ r /( q6 ztpdca;8(rrez 6;(8/mbcq(adfwbdep8t )a/ rap1mjnt

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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 ahqdk0wf2( z wu*h,i .7qt(miun ac circuit changes by what factor when the frequency is tr0f(qht2d wqikh, zu* iwu.7(mipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zed cbapw8l1ntq6 b, zz+mu(91jro, the capacitive reactance of that capacito pzz1jl n,cbbm8w1 +qt9a(6udr

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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 capacizkvm a0;hv- .wt*y5rz,(rkyq cu1h) stor in a RLC se5hy;a y*whvz-rr. 0q )(,cut mvks1zkries 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 o6cyw+/ e (nz9fkjx/icircuit 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 increasesc x.+ y0f6x)cm7wd:)srk rpxq if R increases. When is this staterrq cc) fp7 y6x +m.dx)wx0:ksment 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. +;yn boid i)4v The impedance 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 nye *mo*r4my2ks zzhi o)((l;aa.)quof the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance botn vx k,ow;yto51p28zl 1hw)i dh double in an LRC series circuit, the rei,hlvk 5ton8pywo ;1z12)x dwsonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuwdp f2hgxb f:l9/s. g8it that is driven by an AC 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 9(ayr o petnd1m+ctm 5u:q- (ccircuit 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 rotating in a uni2k .b02ie 0aszk4 zsjl13w sywhoq/e3form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiz0k zeyjbkw34a3eo q2s1 h/sw.i20 sleld 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 radag pvx/ nfd;(121 u.v6jok ihhius 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 field vector are perpendicun u v1dv6jifp2hha1k .;/gox (lar.

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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)lwy7 er,r9a:zwu i1 p.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of a9y1zrelwpui7,) wr: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 reduysra6w e-b 1er5fq ,5rced 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 channo o3d-+q iyj6ges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. pzr t+w ob*u574jk w.j 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.zk j *r.4ow tpj7uw+5b0 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 wr0t+ 01fxa :g 9 wfcreg,-gzjqith 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 jrk *a330 sherqu7q e-zf;;xfand 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 horizontally at a locat 09,dogg.xosy u( dkts0k9x s5ion where the downward componek9,xotss(. 5us okddx9g0 0 ygnt 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 rotates at a constant angular velocigvb uw8ed,h)i0j0 6rety of 2.0 rad/s about a vertical axis through one of its ends while in a constar gjhive,)6bde0 0 8wunt 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-sectional area ofme j4 rbyptw ib.e,/ 71+iul1a $0.25 \; m^{2}$. 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-xt.7cy06:7pt8q cgkpxvjxb 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 $emf$.

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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 die *pgo,z 1th9 )qcv5elgs6+s)b)nxarmature. 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 of rotation, what will be the maximum output voltz5g1qxghvit)+b,)l )n o*pc9 6ss ee dage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire omzjn;cbf + 0p,q4.oy uf 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 an6;tcl u:;blix output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area ofxl:lt 6i;; cbu 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 gen jz6n xfjehf67).f (mxerator 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 6.00 W. Then0adg6kot xg:7z.h*h 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 resistanc,9hef9 vce3xzn0a/t ka+( sxme of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bm3t n90sfzc+eeh xvx/ ,aa(9kack $emf$ 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.x p.0a4rz)2sfqp0 pc k The operatingsf.xpakp2z q00p )c 4r current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W isz h zb+3xzdni )l;n.d; connected to a 24-V power supply. The operatbzdn ;z.z 3;l)ndxh +iing 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 powegm,ig+ :b3 fwiyp 1+qcmkm98xr supply. The opera+3p wixk8 f:gmcg + bq9imym,1ting 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 isi3glo-w7zmsq(/bi, qavg9/j 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-turjhie5 .gmz2r -12 xu+7ztbv kln primary of a transformer causes 14 A to flow in the secondary. How many turns are in the seconbl7.z1rg22xej+uhz -k mvi 5tdary?

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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 i:8:1ad fjx vhwf the 24-V secondary has 1008: 1f xj:havdw turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-tur*0out+1xscvcppyp n 0*x7ie 0rk-eb+n secondary coil. If the curr7xsk u1vp0ct*yb0iox+ c- e0pnep* r+ent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer.uaeb* r 6e/jj, Assuming 100% efficiency, how many amps at 24 V can rj6ue/a j*, beflow 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 s :*spn1pc*mzneon sign transformer provides 7500 V at 10.0 mA. The primary coil operatesc1*s * msnzp:p 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 prnt+u h fu8g)-0a/kua /mex 1hcimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vomfeact8 u/1 ku+ )0nax-hghu /ltage 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/7uug ipw pp8iznf;61 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in th1;ugzip 7p8iufw p6n /e 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 i;3tjp/pi 5iw 0bu jqtp4v+,b 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, w3ibb+ 0,v4iptw ;j5 /tjppiuqe 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 secondary has 200 turns2lfsiaw1t 9bn d) )js0)v2hac . If the input voltage to the primary is 100 V, we can expect the output voltage ov bs)1 2fwhlna0d)t) as2j9ci f 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 transfopq zdxa z,94b4rmer has 100 turns and its secondary has 200 turns. If the power input to the pria xz4zd 9qp,b4mary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usual dr8 j5.grr 8c5trme ar5+8qquly stepped up to 4500 V by a transformer and transmitted through a power line of total resistr 8+q58tq .5cea d5r mrr8rgujance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped1d( y2c2oa rgei.i 2po up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissr.1 pioeoda 2cg 2(2yiion 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 6heo542h(l fh+u5 hyb m0 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 percentage power lost in the tran 5 (hb ufhlymh+5e24hosmission 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 resist3m a7/fgz8d284vuch* qh ztb* clmw9qance 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 voltat/ 7f*wa9l 4vu2 zh8gz mqcd8m *cq3hbge is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totnjbaxe1mhg: ( x/m8dt f.+ v7pv0b a7lal resistance of 0.60 W. A generator prol7.b xd/hv7+pbag m0j8 xe:a 1nvmf(tduces 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 the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How bsw f6v9a2z at3o. ho* 3nmt8amuch less power would be lost if the power were transmitta b *.v2wt 8s 3oz9nam6oahft3ed 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 wj jui oqnm2j);z02: b +2ukrqat 20 A. It is to be transmitted on a line with resistance of 0.60m2qno)rjk wu;j2 02zqui:+ jb W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stosw9z (a0pmw 2xred in the coil's mag92aw (wmz0 pxsnetic 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 inductorfx3oog* j /pa6,zgbbspy1) 5k4d ;dgi. What is this circuit's time con; d* dbspg)p z6g1 ofi 3y4jagb5kxo,/stant?

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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 ciw/g4;pk8g sex t2hn5grcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peyqanu8/5x9o wm:kzg :ak 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 12z,+yen zp7q4. pxb fm:1 bc5yk0-V AC outlet. What is the resistance of the lamppq ez: .xb7cp m1b45, knfyyz+?

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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 poox sa3 yn 7j1dqkmt;o;bsj,* 3wer supply. What is the peak current through the resisto,y doq;*173nksm o sjxa3 tb;jr?

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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 connect r, qf akfm4m)d*eu*o-ed to a 120-V ac power supply. What is the power dissip-f4qe),mdk *rfm*a o uated in the 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 resistor is vxn6 z(cdf4( xrfb ff +/1o;ym$I = 0.80 \sin (240 t)$. 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 aqu3t* y )mhnpf-;hj 1resistor 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 wzwt:rd257z qjs8na3 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 ayyr s8vv+rirea61 h1 m,2a1uj 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 H5e ntf i6p4 4/:y0wff go/whbgz?

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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 reactand ta*,,pojzr: ce?

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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 rv) apu /jdix2)7,vjtyeactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 zqmb04ba d 8ij(pu2.kkHz is appliedku(bd i8 z.p40baqm2j to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.eqk07z pw *4nk0 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 capacitivet;b x*68(7- danjr)w ( nogt7 saclfgwv6 5woc reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 5wtmn)8w 4i8e5 co z+qp7) rhia0 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor hae n*z d516t .c/lkxktave 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 0.010qf.;cgr o, ;yy-mF capacitor be 100 Wo;.;y yqg c,fr?

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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 fa 2*go3qfejc.;sga nwc/ );a through 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.wkuegho8vv,3j )7oo + 0 W resistance, 15.0 W inductive o w7,vh o3g8+jev uk)oreactance, 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 at 1500 Hz if a 100-W resistor, 20-hbkcmg 7+qv r*n4/f3 9sjmvv. c+eqd/mH coil, and 1.0-mF mm h7f.q+d *cnv4r/jv+k/esc3g 9qvb capacitor are 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 100-W resistor, 2xa69e c n,z jcma:-s*o0-mH coil, and 1.0-mF capacitor ac xms- 6 :9an,aco*ezjre connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor,/:pai67 ptmuit o-6ah1i gs 6r what is the impedanch7a6ga6ts/o6 p iu mr1tp i-:ie 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 connec0wtqqz5)z v :sferl0)q0tb0 g ted in series with a 20-mH inductor, what is the phase angle at 1000ezf ) bt0005wq:qrgt )lzq0 vs 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 cupyd3r,8+i4 4ytk x jyircuit with a 20-mH coil and 1.0-mF capacitor for a total id,j3ik 84px+4y ruytympedance 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 capacrnt(oy q9) ha,2h:x 0wsw3urmitances is needed in series with a 100-W resistor and 15-mH coil to get a twxs,hr omqn (w)9hau32:r0 ty otal 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 +p y 5x7xgy6wda 450-mH inductor at 5000 Hz for a totaldg65pw+y y xx7 impedance 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 seriesr;f r0y1dtcmvm-l: fk: 0q4zq with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?:t;:zlq0v4fry-k rcm m0fq d 1

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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 iwl+2, 5mmc 4( (z) yibharereumpedance at 14ca u(b ri(zwl2y )memrh5,e+000 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 withf 2 l(am7vt5gr*ymh0w a 10-mF capacitor at 1.0 kHz for a total im2 (ytwh0mfm*v5g7 arlpedance 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 i3 k;p wif6q;u6pp qn0bn series with a 10-mF capacitor at 1.0 kHz for a phase an30 6ibnfqw;6 p qp;pukgle 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:f1,h3qwc xw)k jh ( sy9xl5ur a 30-W resistor at 1.0 kHz for a total impedancej:x,5s y)wk r q 1fcwh(3hlux9 of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 12089ha.n nw/bh b Hz. What is the phase a/nh9na 8h .bbwngle?

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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 1 idvws 4fje*,8 z m6b,iio3n)g00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series,6e8b i)w m4fngiv i,3dz*osj ?

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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 consist1s)4 qyg-oj tfs of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inq tg )-sf1yo4jductor. 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 capackwy/j+i 2e4 ge5 hnkyzvn2nt7u7 + /afitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this tfwna 5ynh/vienku2y 77z+ j4 ke /+2gcircuit?

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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 resistor, a32n3a4m f ycec 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powerf4ya2mec3n 3c 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 sericq7t 4u ( txlc(cs9+nwes with a 500-W resistor for a phase angle of cuxl4t scw((9nqc7t+ $40^{\circ}$ 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 kn,p03i 1 uffhfrequency should the circuit be driven in order to have mupf k,f h01n3iaximum 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 circu,qktt bomeb 3m( iu9,2tg 5hgkju)z-3it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancit3,jk bthg 9q32,mtu)mouz b5ke g(-e, 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 circui1a3v d q- lugbtm )s(s6nqyt0-t 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 isgk ak8cd,t-1 v the power factordv1k t8gc k-a,?

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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 containing a 50-W /:)6: m0w iushmfwcadn5jq h5resistor, a 10-mF capacitor, and a 0.45-H inductor, qf hnahum:6 w0wc5 ds/im 5j):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 yz7/ zgy,-jek 1.0-mF capacitor and a 15-mH coil in series?k/,gyzy- 7e zj

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for ( wf7s4yvpawjkh c*z+;8x:zh a resonant frequency of 10 k(* 7xhcf:a; zywk 8w4+hjpzvsHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resl o* qm92k6ffj laoy:wuo0v06xs (3dkonant frequ y6o9vm*ukoj(0okls d6l qxa: w f203fency 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 a )lkz0cc cqf7 -:c+4u8 9dl4ilkiqkn7pd r0tqnd a 40-mH coil if the resonant frequency of the 00f79dpql )c+ uck lkr4 47kq8cdntcl:-ziiqcircuit is to be 1000 Hz?

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