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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 except7 vl2.-chtqkrv7,wzs

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that bx qr741pb g z0-b7s2grrxtf.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 wire ink:7 ynzvcyu7;aubuybmi9r7l90w e *, a coil produces what kind of change on tc0r bu ywlb a:ivz7;y 7eknu9u,y7 9*mhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field throu jyk+m90lys 6zgh a loop of wire produces what slz+j y60k9 mykind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of ch k p/+t,yn4t2o:ry qxgange on the inducedony :q +ryg42xt,pkt/ $emf$, 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 ab0i*p6ikh/a+epsf sxsv* n 8/n $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a cond cffow *t2u:r7skvf ;6uctor will be that which tends to produce which of ut:c w; fk 7ffs2*ovr6the 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 t;n1 nlc.rlspl 4 rma 4clm8x+ms/yy5w0*nw* pable. A bar magnet is held above its center wi4 xwnr14*wlpcmmlns/nlc;.8y 0 5y+m sl r*apth its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizo:jmds5 3 cl0qylfzs phv:9;a u. ea1*mntal table. A bar magnet is held above its cm9sys;:v:e0 aqzpfl.u 3dl1hm c5aj*enter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetiswuy h3+kh-,lx*)q xj c field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fayk)j,q*hu sx-xl3+h w des?

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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 vectoj 8cjw7 ned h/*kmzp3;r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this c;7zj hp3nwd 8*/emkjcoil 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 t: qv0a-+ntcmxjowx + 2(gtff;able top in a 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 jvawcfn x(q+-t2;:m togf0x+ 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 evezxrv4n31sj/e1b1q zk r-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fr kx41sq jr13 1nzzb/evom 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 l31ezvo)0rj1 j:ionx entering first. As the north pole enters the wire, the induced current will b:oin j1jr e)oz v1xl03e (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis c8pcrkdt f5j9nxx 04 6b(kg(kwhose 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 rota 06 c(9cn8xgt r4j kk(pbxkf5dtion 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 axis who4c,e6oya+qx 7 q, rltose direction can be varied. In a region where a uniform magnetic fiecq x,,+te6l4ry7 aoqold 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.*4)nmkacr7 jns)z3m g l uy,a.
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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 dz )*y41qnr9n vd9 esfan $emf$ 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 magne(kr*uqg9 5p)cndahny k )+m7xtic 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 thg vsppy(gxqs0* f:f;q; -s.cye east-west direction) is moved northward at constant velocity through a magnetic field that points stra gq;s*xs yc g(ff0.-syvq ;pp:ight 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 angularvykxxaz/k*y5:5 w ;zx 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 transfjjj )sk cle2n,4;qhwt0q9 tadz3c0,borms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotaxr12 -es)( wu u6 u1 waf+g4,vczrgkqttes through 60 revolutions each second. The frequency of t vxu+u r1w agf 4kwr1t qzs6eg-(c,)u2he $emf$ 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 devi ozhr(46qocz qaf,m e(zd6n: (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 2eo0wl1*chsuthat

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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 t5bx,d)d(ab bi:-gpi xhe primary coil then,bx xpii-g5abb ) d:d( 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 salx j5)f9q18vqz bmz 2econdary coil 82fx)q vml15abzq 9jzthen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inxz p+*h:k ewz9 m2dcus3lj*q5put

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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 circy1cbdka;,7kp 4jv 0cwuit,

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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 induc rwy/. -,//tzfaq 2h3e nqxeuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wnafr/twy e-hx/ ,quec/ 3 qz2.ith the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connec3 hnbvf 0 *zijusp)j49ted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage a3vjh *)49iz0upn fbsjcross 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 res,b 3dwk, 2b-bishex :listance 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 w pu cg5s/g v8f0qm9l)gb6r-skith 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 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. cetm*bt j1ef9ci p5:5The time constant for the circuit rep5p*c1m ifbt5e jc9: teresents 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 battery. The b7gsuwgisd 1+ek 1+4ak o8.jic attery is sud i dgi8swe4+oj7kg1a ku1c+s.denly removed 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 m)n 5k eoe 92c6r*fc8bmbhj:ueqm. +k have 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. On this circuit5,el lbk,,m t46ama *yj.hmi)r 4xcfe, 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 circufvo-u -ek :xo4le- g+bm6n7kk0qw 3s zit, the curren-ve+q73nk4kw ge-o skx:uo0m -lzf6bt

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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 changr,n)a9( xsjqh es by what factor when the frequenca9 qsr (nj,x)hy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across /xkd4cwy6b40 cdw 7:: 6 lge damjher.an inductor is doubled, the inductive rea:jywg4 :mhaddb kr /6.x6weec07l 4cd ctance 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 approachg3;fa 7v 7;q7pezal pwes zero, the inductive reactance ol3 p pq7wa;fae7z7 vg;f that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the (fo4g 0xv3 m+tq g-whscurrentg(-t 4 wh+gqsvo0f3xm

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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 ch (p5b 8xl l9ut5cbxi1fanges by what factor when the frequency is tripled?xtbfx ui89l 1pl(c5 b5

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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 acr0kp:vw9o- x bfoss a capacitor approaches zero, the capacitive reactance of t0kfbw -o:x9 vphat 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 inductoob yxmch ctp ah/o-oox(3/+cx,h0 )b2r and capacitor in a RLC series ctcmhcc(3 + o oxp//x xao0,o- )yhb2hbircuit?

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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 RL: r4c gt3xsz o4q5t,eyC circuit 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. Ther f3d (ssv5p,i impedance of the circuit increases if R increases. When is this stateme,r(dpi35 svfs 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 impedance of the srek1clss z,s pz,3*o.tr+5nuts29v 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 circulfoetl ek.v0 -ojdcw2r*739/ycq-io it. The impedance of 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 both doubqast:6h2yqf; le in an LRC series circuit, the resonant frequency of that circ2q 6hasq y:;ftuit 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 voltage. At resonance,o7 9d3z:h 1pc,xc:ku bntzmy)

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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 ciuiuqn xg3:s:0vi85 rlrcuit 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 magnetic .exl **1jr n zm95snfzfield of 0.20 T. Find the magnetic flux through the loop wf5zxn1ml.n *s rj*ze9 hen 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 radiy em *qmal+q40us 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 tm le4qy0qm+*a he 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 magnetic field oc03gln 8c (j j2dom(hsf 0.20 T. Find the magnetic flux through the loop when the plane hl( 0oc(cjjgm3dn2s 8of 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 reduce zqj gx,(-g( +evxl9mud 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 frofe4obptlg)w(., 5e zug)a3 o am $4.0 \times 10^{-5} \; Wb$ 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 wi m a9f4w19oe7e0q liaa mc+k4sr96m rqth 200 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.o+l wa ieeqr9qk76s0 mrca99 4fma4m150 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 35.qs l - qkyiv.+kgulan 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 rk.e sw ) xsd9b,s,(ffand 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 aul--upg9.kz 3fx- h5p xp-jp at a location where the downward component of the-ppaxh-z--lxgk5juu 3 fp9 .p 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 velog:e+xj -nv9 vncity of 2.0 rad/s about a vertical axisnv-j ge:9+xvn 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-sectiona:btc c n vuq50uk667zjl 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 wirq/w )ss92n8jlzcc qy: e 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 rec/jfm)rjsr4y i2 f6dq. tangular 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 pqsr6y4rdjm. f /jfi2)erpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area ;91ag0wj .3fmesyal j$0.090 \; m^{2}$ 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 wislzlw83uq;eq qc;+r7g94qgt k h to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic f g 3lct7 ;zlqr;qk89qg+w4queield of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a tem06+ dkz:xkgenerator 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. The mok p;od26 ca; ,iirr-b7btiz pn:e h53ptor 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 resist 5o.t-./x mfxnqg12)sxfsrl uance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it 1s/l)tg5f m- ouq xs2nr.f.xxgenerates 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.dr0nb2d; 0k.a w8sv lbrut+h to a 24-V power supply. The operating current is 1.0 A. What is the start-up ;uh2da0dkv8lr b+t0b.r n.sw 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 sj uev wuk,5cmuq./;e)*(oti icq1 k7 a 24-V power supply. The operating current wo),u u*m ie.ue;ct5 7qqi s (kc1jkv/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 nphyrf-5 a8cq f3 kfm:+pzv51 is connected to a 24-V power supply. The operating curremhp fyr1-+zc:f ap5 58fq n3kvnt 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 to1d*3ufa w(r jj 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-turnhr;v:-p9sf aosj t8z+ primary of a transformer causes 14 A to flow in the secondary. How many turnsfss av8-hzp;o9: rjt+ 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-kx1you 9x/hw3V primary if the 24-V secondary3/w91ykuhox x has 100 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 coilu +1cjb;l.rgn and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in+nr.g; 1jublc 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. Assumin 5pp) i 2p x9ctq 4ylvyzixs*oz( tb43v)*nb.ng 100% efficiency, howvp b n 2b39xpz)ty *z4in q5i)lcv(4op.x *tsy 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 of0f(hp+ ugagu gg5kt*7 fg /z(b a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. W +ggg tb *f/ugkhu(gz75 f0pa(hat 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 ,jra e6cs0z4-)amawh coil and 300 turns on its secondary coil. If 120 V at 2.-46aca) , a0wmej hzrs0 A is applied 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 transformerv*0mfmjmsxrp s2hcn59 *7f,n has 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 insmx9m,2f c5njv0s m*p7fh*nr 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 turnnddzh4olk4 1vw3y(( xwt 7w/qs and its secondary has 200 turns. If the input current at the khdz1 3x y/ld n wtwq4wov(47(primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer:;ffnux28j aro).gi8 q hmb)n has 100 turns and its secondary has 200 turns. If the input voltage rh baxuom. j:8)ginf 2qn;) f8to the primary is 100 V, we 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 has 100 turns and its secondary gdw-wyynujbl(5,; ch2g6f 8hhas 200 turns. If the power input to the primary is 100 W, we 8 5g(ywwn6yjcd,g 2-h uflhb;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 curra;5fpy p;5wsxj 2sru 5ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the seps5 wau5x; p5 jfy2r;scondary 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 125gr5bla ck9.*gss eh5t54 pds0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted ts 5k9 gp55t5 hle4bgac.ssd*r hrough 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 currtkb:a* 6tl:yiw cqr ;)ent at 120 V. The voltage is usually stepped up 6qtw*;:lrik :ta )b cyto 4500 V by a transformer 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 total ren23jb(e bhvfp 6 bjc.s*rss8o30 mv +xsistance of 0.60 W. A generator produces 100 V at 70 A. In order to rednj8 job .rp3be (m23bh+6c xs*v0fsvs uce 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 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.u/e:t 31np pzx60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatpx /tn upz1e3:ing 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 much less power would bes :y/tuc5-qu o lost if the p/ ut-sq 5ucy:oower 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 hmkvy.9 o/ +dbf8r+n jkkjl1 3to be transmitted 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 transmiss+.o1dvn8hf +3krk jy j9mb/k lion 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. g wikt8,5leg80 A. How much energy is stored in the coil's magnetic fieldig5twlgk 8e 8,?

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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 z2 (9wp jqs/chresistor and an 18-H inductor. What is this circuit'(c p /2wj9qzhss time 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 rms voltage is wd.g .lj 1cpn4120 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 outzbu 71l5vbqzed 16v0 ) ubqjx0let. 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 intyqg riayd) mtau33 */3o a 120-V AC outlet. What is the resistance of the lay3ya* triq)m3 du ag/3mp?

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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 lq2 shi6d )uqb9ffxqou4 3-m1is the peak currentx9)df-3qu 6bs qfoq4 2i1muh l through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power rmskhy( 7l2 s.dissipated 7k m2h(.ry slsin 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 ;db yn+m or4f6$I = 0.80 \sin (240 t)$. 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 resistor isl. ql *jygr.hexxr dw1 b0k10+x.l8w p $I = 0.80 \sin (240 t)$. 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 ro 5 uu65zo7zb3gac1siesistor 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 60 6ww; de7:gavri;46nz7nhvaeme 6-gm q 8w)bx 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 pzwm:p twgy/05qd 4 1(:dm eid1000 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 willu iu08ch l;+fmn6 8y v3l8)hmqwdm gf+ a 14.0-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 aaw84bj w+tr 4a6o d/qinductive 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 6lr/vf vcl5 wt4xq9t3 20-mH inductor when 120 V AC at a frequency of 20 kHz is apvlc4 /9v25 3fwxqlttrplied 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, 60.0 Hontfd ++az8( jn-pnh6 z source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitolz5)9ulc 9q /imakml) r 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 50 W of capacitiu(s. vt* yp1g):mu gxwve 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 have a react5tobococ tzz5.qx6tt)62w l0ance 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 wip: /2)((oo9crv * ;j*xp hzknmzzipmkll the capacitive reactance of a 0.010-mF capacitor be 100 Wkxrz/;n2 :zoczmp(o9*hp km)*vj ip( ?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF du2 938grvqtz 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 sdr t9,g4l0oe;3b; -no ut j:-znjvyaferies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive rea ;tn0 z39t;br-gjjya:e 4-nlfoud ,v octance?

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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-mH coil, a. iao)8rx gak3nd 1.0-mF capacitor are connecikoa8 .rxa) g3ted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-jjzxuylahq( a . *r0,q3odl 60mF caphj6xqz lda.rq*u3o j0ly ,a(0acitor are 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 wuntf9e * zpn-jj7a6r 7ith a 20-mH inductor, what is the impedance7p-rnat76 en*9juzjf at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in se0/qqaqp en*ld21hx* kries with a 20-mH inductor, what is the phasep/n1ex2dqlq a 0k**hq angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil adohj 27+( tfdsyp ym/5nd 1.0-mF capacitor for a total impedanj5y t p+/hy7mdf2os( dce of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 1sa(a 7lio3ry a *;: q/4rwhlhk00-W resistor and 15-mH coil to get a tosl* y/kq(a4 ;oh7wi ra:lhr3atal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH,,afqhfk :y+0emc qw) inductor at 5000 Hz for a total impedanc)afk 0q:w,hmy,e +qfce 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 iw7q :ce:;vepat 1.0-MHz for a total impedance oe;qpw 7ivc: :ef 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series witnkv1 k (h2efmu e573c mexu6m-h a 20-mF capacitor. What is the impedanhvu f 3emcxe 1uk(5mme6- 27nkce 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 needa8jxx gp:+eijqjc7 +6*mga; jed in series with a 10-mF capacitor at 1.0 kHz for a total impx7apxjjgqca+ *;+ij e6j:g 8m edance 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 np ouq/jr8st; gh63k e 8cs:rz;eeded in series with a 10-mF capacitor at 1.0 kHz for a phase angl;z6c :opkjsh8g/t;q3 rreu8se of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for nq3 nmt73:xre (hid( ja total im((dr:nexh33in j 7 tmqpedance 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 sem*z.clr cw/b.zt8e;b i0xmgm- 81v ivl6(jt pries with a 100-mF capacitor at 120 Hz. What is the phasemb(vl 8j0c.vc t6z 8.wm-tbpxi zi*le/;mg1 r 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 3axi4zoh),ma6j,;gmz mb kpkvp u8; 9a 100-W resistor, 20-mH coil, and 1.0 9a8a4;m;ujp, )kmbio3zhvp6kxz ,gm-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 1u2rkxp56 /bbp00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-Vp x u5p62bb/rk, 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 react :mp;xf3 (zpjjance 30 W, and an inductor of inf3ppjj zm: x(;ductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contac4lp1b+5hcn3 n/ vtf :-cznchining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?4-cn h1czcncp3v t:lfh5 nb+ /

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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 seriesz eebpw .zq4p+b :3;hb with a 500-W resistor for a phase angle of + b:p;4zqzpeb we.3 hb$40^{\circ}$ 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,;80 5s dcx:ugpq ux4q;udbof4 L = 200-mH, C = 10.0 mF. At what frequency should the circuitc8 uqb :s;u;x o4pfxu0gdq45d 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 resistance, 1oo8 j2prypc +ngc+ 3f8q+dm j,5.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is con 8dmfoyngqr j2+cp ,+8pj3c+o nected 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 circuitlokltrlzn, (+ ; 4dbh690u8xcfrh2-w cu cip- 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 Wnnk75co0ytgvny m+3*9 rt h.a and a resistance of 30 W. What is the powerarvy+.0 nhmnt9 k7y5 *togcn3 factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series R6hyawfp4g 73nLC circuit containing a 50-W resistor, a 10-mF capacitor, and 4hg6 apw37ynf 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 resonant7. mcnza;r nd32w thrq) v9tg. frequency of a 1.0-mF capacitor and a 15-mH coil in series?gr.vzrwmt; nq3 9a7c.2)d hnt

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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 serien.)hih7 .n6znfphan jbruy c-+ bw:.* s with a 4.7-mF capacitor for a resonant frequency of 1cnpwfj7 b-..zr . +hhaub):yi nnh*n6 0 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 witv7y-avl vg1)xfy1 md; h a 3.7-mH inductor for a resonant frequency of xvm1-ag l;yv1fyv 7d)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 serizi0zdh4 : srp8es with a 30-W resistor and a 40-mH coil if the resonant f zh 4r:zpi80dsrequency of the circuit is to be 1000 Hz?

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