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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux except (3iyp5w fep/(vywnm7e9 ltz0

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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 tj16vwh(bo d5 lhat 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 of wireknvq )j+nv m ;1i-e,xj in a coil produces what kind of change on the inducnij 1+k xnvm)j;e-v, qed $emf$, 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 th m fag-khc+no 10t7kh+w0 1gtee magnetic field through a loop of wire produces what kind of change on th0t+ 1-ak7megn0+h h1kwfgot ce 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 kind of change on the in8s f qlg(.g2nyr.+ofi du.( qo.fg 8igy+2rnlsfced $emf$, 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 field,ibksi 8k;qzd1rk5h,7 ,yt;exvh nq 2 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 p e7mhiv t8: zz68sav:of an induced current in a conductor will be that which tends to produce whi7mi:ezhv 8vp86t asz:ch 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 magnr9f)hr9 kqad)i9 i:l pdz(79n8u vcmxet is held above its center with its north pole pointing down. The stationary magnet inix7 uakd9c8 )h:9pn(q df9)vrlrim9z duces (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 helzxt-r hfrl:. n4 .f(bld above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abl:f r-4z blrx(tfh..nove)

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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 field rbs/e,2 a ja tj ozlz,gw3k027vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thags ,0,w atkb z/o7jlje2 32rzis 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 t44ic p2.pc:,9jx aggwmqi 7bbop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ofip ic b.c a4724x,9:wpgbm jqg 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 (82kgvh(ay l n5pz+bt;*cqq(d vj q4p region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field d4q+ a hp(ytzj;kp*g b2ldq8v (5nq(v cisappears?

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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 horizontbm0oz re 6+(1vk*gerzal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles ze1 6gz*v+keobrm (r0

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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 sw-c8uw :z5w* ujxkioch3 4*oloop of wire with the north pole entering first. As the norto uowwzjc 4x*-k:8ws* 53chiuh 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 speed about a2nva .dq mlg z4)8l pnra+;rz/n axis whose direction can be varied. g;)rllq /+2 zd p8 znamn.a4vrIn 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 constant angnadlus 3h8 9ga.h .l2y2md8a jular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced . gylajh3sa d98 m8.a2hnlu d2$emf$ 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.hhwm (lqmw oi3;1/7atjh p0m.
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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 hv(z7ljisgg6vh 1 i) 3that 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 euh6mzv*qtxh5uj( ; 9 a magnetic 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 df sr)18;d1mr s,y m)qzqzw:apirection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemes),y 1:prmqwmzzqf sd1r )a 8;nt 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 rotatessafdiy,*z /i9/4zh pa 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 transfczk8)g 39qxjhd8 ; 6 bovblhy6orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates8/:u1 fz48 ig u-yynnbvjfb :m.tp cp* through 60 revolutions each second. The frequency of the 4- pb /8ygn:zi:*n.jfufbuc p mtv18y$emf$ 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 der2oupptp7m rme9j p9s7y,1 3o7gyn -qvice 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 thatqm4nw) 0ushu 7

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primam/y:: unnw7 9ln ebyd(ry coil then/yy: d 9mlnnbue nw7:( 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 secondar yy eo)9/7to5z5w e: kajglp:4zvg0 npy coil th55:pk7 o g j a0t/e:4ezw)9og lypzynven 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 poweug87x joa.)lv .1c1 u zbyf9thr 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 circuitvuuw ;j(a-6;,j,lnndba2 . vz.lmgp m,

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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 batterxln z:6eoh*t:n3kz2k y of constant terminal voltage. At the moment contact is made with the battery, the voltage 2:z* hxn3oek t:lz6nk 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 connec3 dt158*4eqcn zh0 vn sjdok/:pat(gzted in series to an ideal battery of constant terminal voltage. At the vq (zk:c5sp*8z0gddtje 34nna/o 1 htmoment 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 and resistance R is connecvogr(s/ il:* uw hs7ju3x .if.ted 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 yas48gs++jlzrc) aw) 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 c7v8xosggr6s z /7dqf( onnected in series to a battery. The time constant for the r786 7dggozs /f (sxqvcircuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bb1k cri 3oz: bfn8h7r+y *z9dfattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for thzn8ki*yb doc7:r+r9f13bz fh e 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 wj* 7:hhuh kysm6uq5je np5)5the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this xpdj;;8f n obc7 rec:,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, the currlqf8grsom15e h*so1rk ,b, c3entro em5g*ch 1lbrk3q8,s1so, f

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance p0rqvkizy * .5in an ac circuit changes by what factor when the frequency is trik5q *0 pv.rzyipled?

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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 it :ap4gj+qq smq:,e+d w:2lybs doubled, the inductive reactand:24 masqq:, wlqe+: bt+ ygjpce 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 AC voltage across an inductor avoqzv6/p5 6z5fy* jxd pproaches zero, the inductive reactance of that co xj5fzvd5q*p/6 6zv yoil

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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:dmwgmmr e /3f93hg f/0r o0xr to an AC power supply. In this circuit, the currentrxr9w:m00h33 fm o /egm/gd fr

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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 chg,hoghk1 )nj n jsb7,*anges by what factor when the frequency is triplen1hbgo k hj*7j,)g sn,d?

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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 volt3iya 9z 1md6 1wtl1eqmage across a capacitor approaches zero, the capacitive reactance of that capacqyi 3m16e11 z awl9dtmitor

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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 voltage1ffqfjr. *l e2s of the inductor and capacitor in a RLC series q r1lef*2jff.circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as 3q fue/p+j q7whdqla ::d8us ($\cos M = R/Z$, 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. Thi) . rg-3m *ugrqmakk:e impedance of the circuit increases if R increases. When is this statemm.3q:agkk giu *r) rm-ent 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 cf4 j7jy) hnw0 1dd;slsircuit 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 circuit incrmovi9a/w3 v v(1-kzrqeases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both da5*h4 f.ghyi et(n/ fqy xm0r7ouble in an LRC series circuit, the resonant ite.n 70f my5xh4ah(rq/ y*fgfrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltadv-*5wlh-d o hk5zdx(ge. 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 circ umi.)7fdyql5 2kb.r*dpmv 7quit 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 uniform 2 lgk5rsq qhzo:hm3)t+ a)j+gmagnetic field of 0.20 T. Find the magnetic flux through the loop j:2zo q qtg g) a+s)3+rmlh5hkwhen 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 magne)jr:be/qa : emj:fqf (tic field of 0.20a(:j fbr: /jeqmq:)ef T. Find 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 ini*g4 / xzl)jrv a uniform magnetic field of 0.20 T. Find th*v )r/jizx4lg e magnetic 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 *oh 2.d2cromu 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 from dt4/z kni-m* w$4.0 \times 10^{-5} \; Wb$ 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 4oww d)ahv jv-8jh.;m200 turns of wire on a square frame with sides 18 cm. A uniform mvwh.odhw-4a m8;j vj)agnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ;h 0lhyrc8z(yp 3whdm8tz q* :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 areaf s7y+6 atw8ss $0.20 \; m^{2}$ 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 hori)3 -vi7 m mamje,d(igrzontally at a location where the downward component of the Earth'73 ),mrgmemvaj (-di is 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 velocity c8s0 1s u(sgj6vtrzgn l5,2sf of 2.0 rad/s about a verti5zc8 s( gu 1j,6nslvt0f2 sgrscal 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-sectional a*jtxd.p0j uhq 8q;o 3wrea 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 consd )vgb+qj 4*yhk p,v,dists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each *7cimjvi74m :kvt8zo 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 maximm7zmco 7ivv*:j4 tik8 um 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 wirehsxh(rdy(or7 n sfj:) by3.* j 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 output of 12 V 5 x-q7gd1njoxoh+q+w maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coi+njhx1+ 7gx oo5qqw d-l is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a nri021lnwzrv 9* qjv *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 09*jphzreykvsb64,uq r2w a5 of 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 ak(w.p0ao c/jpo 9we*z resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generej /opwkca.(o9zp 0 *wates 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 resistancvlrl;ibjn p)+/a- * (ls7 xpxfe 6.0 W is connected to a 24-V power supply. The opl n/ l(xxf7*-pr+;s)ljapvbi erating 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 is connected to a 24-V power ea( sg4hh,b* zsupply. The operating currenz* e4bhg(a,hst 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-an/i,n7g . zxtV power supply. The operating current is 1gnz/ 7ti xa.n,.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 red 5azjh/v,oh d-uce 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 cy:l g0e m /dxyw 99h56ahkpc7jauses 14 A to flow in the secondary. Howp5:lgw 0jme/c h9hk6ad7xy9y many turns 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 necess jnhl6: po(,q(8ihrx vary in a 110-V primary if the 24-V secondary has 100 turnpiq8 :6x( h,lhjnr(ovs?

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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 co0cw8pw)ne , p4l7wkt6-nqpl oil and a 2000-turn secondary coil. If the current in the n7ec 4woqpwwpn-lt0lk,8p)6 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 transforme,-z+:jp zp7ieikq8 fhr. Assuming 100% efficiency,7j+q:z p fh-8eii,kzp how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfb.8 fsnt5--opbf t7m*5hpxetormer provides 7500 V at 10.0 mA. The primary coil operates on 12ttepm5-n.h osbfb 8t-f px75*0 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 i fuks 7*n8b2olts secondary coil. If 120 V at 2.0 A is applied to the primary,bufk l o8*2ns7 what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on l-w,fpbe v 36c-7cqm jits secondary coil. If 120 V at 2.0 A is applied to the primary, what c 6p-c7mvefl, -bjqwc3urrent 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 y0 s5a8;ej kxf100 turns and its secondary has 200 turns. If the input current at the primary is 100 Af8 kxs;ajy05e , 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 s. lxao5yd:1(8 z bkj 8j4aknqwecondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outo ba4q5a1kw8.( jdl:nkx8zjyput 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 transform:ml*(8 fjn0fq2xwj/ bw uk at;er has 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 to be/0un2; lmj8*: (wj bfk xtaqfw (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 usui0g)uwz;g ) rkally stepped up to 4500 V by a transformer and transmitted through a power line of total r0wr k)uigg;z )esistance 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 at7kb prbw6cf qw6(yku5fv /hb;5y*td8 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resiu6hw*b6tp c5y/y vdq kwr(fkb 5;b7f8stance 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 at 120 V. The voltage is usually stepp:pt.zr tvy+wj 9;) aeped up to 4500 V by a transformer and transmitted th+ : tw9;z vep.yapjrt)rough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resis7 jb 57gkaye5ttance 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 7bjtk5ag 7ey5 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 total resistance of 0.60 W. pkruts. zxlq073 7+ikA generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage i+rk7p7.z 3xu0 qs kltis 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 much less power would be c1e*;7u+ qgjhr r3fqu lost+c;g je ur*f3qur7hq1 if the power 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 tranmssox4h z 4fkx8 +p4.vwcb5d(smitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppe8s xo4d4vf m(.bzp +h54scxwkd 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 stored iry;a,3 xptrg/ n the coil's magnetic field? r,x/ 3ypga;rt

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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*egj2zn/qk *g an 18-H inductor. What is this circuit's time con/nj *zq kge2*gstant?

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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 rms .z wd(s87ifdnb8ckn 5 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 1256xdqj;c3l xk,8 uolnjbdbf1y lb-7 5 0-V 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 ukjf;je6: my x8vvb qj4e5.duy2z e*7 resistance of the lamu e27*6zy ;mvbjud:ej vjxeq fk5.4y8p?

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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 c xagt,9iej8km8 ihku(k; :pe4 onnected to a 120-V ac power supply. What is the peak current thro mkki u 9eg88;px:i(kj4et,ahugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac p *6r q-0z5ycjtq-dyu dower supply. What is the power dissipated in thery-qj t 0u qdzy*6-5cd 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 udg+z0hb 4c7/f )4gheeasaj0bm1 o)j50-W resistor 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 az4,ftu;wzwg3 ;(qrpu 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W req3wq7 r.aj b(vsistor 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 inductor at 6q1*;ssxxv-dw7,oj x xutb d;) 0 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 100 kd-(q0tarpw: 0 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 inductiv7k) 2hk6 btdyle reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hzcu j+zb1s /7sx?

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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 120b :o6 sza:/5tf ch20 iuaj:nqe V AC at a frequency of 20 kHz is appli fn25be/qisz : 6aou::ctha0jed 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 throughv v:8)k nsdc8q a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactanc, xc;u*qx 2rfeegi )n(e 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 nqki-t/nzrr s6.p7*jnk * yp y1lj.zs ,eeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF cap6 b8a::fut ewjacitor 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 thn)bo6 ,9gacqsx1 bw j,e capacitive reactance of a 0.010-mF capacitor be 100 W?wj6a cbs gn,1x9qbo) ,

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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 0.00 d:/hc8l9w pvy10-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 okdphk +dc8q4; f an ac series circuit with 12.0 W resistance, 15.0 W inductive reaccph+;4dkd8qk tance, 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-mHicey 5g 1yb9zbh2gk,8 coil, and 1.0-mF capacitor are connected in serbcz 9yygikh28eg 51b,ies?

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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 ci)w :-l9gjbri3 .jpo -.a) nt,hqadoHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec)ihrtq9gajd-. ).3a: ic ,jbo wonlp-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 ,pa 1zjqa)f y5;01hu; (aefou+ dcqfhis connected in series with a 20-mH inductor, what is the impedance at 1000 Hzqd;qef5zc( 1haaf,fj+ 0u;p yo auh)1?

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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 in.nkh(fu .z *l,z5 sn9mu 6bzxaductor, what is the phase angle at .z,bu6fam 5lzxnh zu*s. (9nk1000 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 1.0oj/ k6u *wz*gy-mF capacitor fo/*ozywguk j6 *r a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followin+cpape,,ko / lg capacitances is needed in series with a 100-W resistor and 15-mH coil to get a tolappoe+ k ,/c,tal 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 witw m7v0gw99qq gfr6o2wh a 450-mH inductor at 5000 Hz for a totm7f w 90qgqr2wg9v ow6al 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 series with a 100-kW resistor at 1.0-MHz forcpvh1,lvwqop;n q, 7*jb/x/q a total impedance of v,b cwphoq;n/x,vq /1pq *7lj150 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.9p1qcc64 fznqxdt ( e9hg(8y kby3w7e What is the impedancyk4x beg(y tnhfe36p1c 8zcq9q(d9w7e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz humj* w98m fcamw794*s4idli for a total impeda 4 dsfuci4 9hmw9mlm*ij w*7a8nce 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 in series with a 10-mF capacitor at 1.51 wibqwv4v:-(f4r1b cu uqgp0 kHz for a phase angle of g 4v-5b(iwcwvbq1:1ufu4rp q$40^{\circ}$?

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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 rbu l 3-j(qymrm8rkw)0 esistor at 1.0 kHz for a total impedanclmq3w k- rjubr8my)(0e 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 sv83xv5+x l w0arxt1x zeries with a 100-mF capacitor at 120 Hz. What is the phasexvxrtxxlv15 z+w0 83a angle?

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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, aiud2h/n +qyb3mxi2+g8e/6yz+ pnfyond 1.0-mF capacitor are connectedhnm/qiyynx3+ygudo 8 p2+/z2i fb 6 +e 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-Wh *e3uxb 0(lgnke8ilpbd;9tp ,5 qti1 resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is q053 hp;( ebnx ei 1tt,k9gp*8li ldbuthe 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 inductojmvp:ig59gzh hxl7)zhoi+x-( l0 c2 sr of inductive reactance 30 W are connectedh z + gozxl 0-i9 picl7ghs(h5:jmxv)2 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 contaimrln)g j :f2kgst+d(6 ning a 50-W resistor, a 10-)lg(:gfr kmd nt2+6j smF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nmqm:lhp+ 09xmecessary in series with a 500-W resistor for a phase angle ofmm qm:h+p09 xl $40^{\circ}$ 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 ji4cxdqb-p9 4 b y8k-wwhat frequency shoulb44-wjickb8 d pq9y -xd the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resis,ucf4f -gj(1 j m6j skh1bkrv1tance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V mf hjrkjfu - ,bk16gjs (4v11cpower 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 i oku9)6qff 3jvs $63^{\circ}$. 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:vua 9hd dxq(++bpu+ k has an impedance of 60 W and a resistance of 30 W. What isp v+a:duk ( bq+h9+dxu the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for )hatd;cxct2ve5w.vf7cj,g q :s:t7 p pe)*lma series RLC circuit containing a 50-W resistor, a 10-mF cap) cv .xt paqs 5,2v:fe7dth;)mpl w :jct7*cegacitor, and 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 capacitor and a 15-mH 7tb- v8cz+dms a0w0 ) d7hmiufb5+xlq coil in series?msxmd alb7hdbwi 78vc-q++5 f0tu z)0

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n zis* lk /bc6 06;fenl)oka8veeeded in series with a 4.7-mF capacitor for a resonant frequency of 10 kHco8l;kki *0ef)nl66/eb s avzz?

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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 j eell(dcfu /;sk/tw ;f d88g1for a resonant frequency of1dwt;;c(sjel / f8fk d/g8lue 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-Wjpvohzyme u/p*/:e g:sl*5te7hzf*2 resistor and a 40-mH coil if the resonant frequency h*te/p hf*zljvg z2: :*ypuse5/7 om eof the circuit is to be 1000 Hz?

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