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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 kk2stt823rq tmagnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction state; 8xveza ;kvcxfy91*ls that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in rtalq w8 .s;0ua coil produces what kind of change on the .usrt ;q aw08linduced $emf$, 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 througv)*n9;wwuu *yex9l lbm;qa)j h a loop of wire produces what kind of change onwm9))uybe*w n llq ;j*av;u 9x 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 change (kt.t :jw7 b.j3hyxbgp.m6ovon the inducewpk73t 6(jtomxj.yvg:b.h . b 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 fe7m reogj dbxnb+/ k4j2*l 0,tield 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, ncnyx6.6(naxfn q9 ox*b *, *w,inu odthe direction of an induced current in a conductor will be that which tends i d*xn6nc(wbfx,xa* q6nnu.y *9noo ,to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above2j 6)7 3vcim)qabr ync its center with its n 6n)i)ba7qvm3 ycr2 cjorth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovmgkadfr3,q p-r m*h2 cm) +)upe its center with its north pole pointing down, and released. As it approachm)c m ,mk)du2* gp3q+fra ph-res 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 t*m1pz-jdr dx, *-rc irop in a region where the magnetic 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 fades dm*-*xrp1zc j-rd,r i?

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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 fieldsu:zp7mv98 n)j6yx yw vector points straight up. The magnetic field suddenly grows stronger. When viewed from abov: w6 u8jyn)9xym7zvspe, 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 hodr; re)lf 6bzada6wgk:8 d8uq oa +2(arizontal table 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 disap68kaawdqa2 bz8(fdd+ l: guro;a6re )pears?

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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 anqsiek4px:lw ;/d 8 d6cd carries an ever-increasing current northward. Two coils of wire lieex/6:q s;k cddpl8i4w flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enpbr. 1u ijf:o8wu-w;wtering first. As the north pole enters the wi1-uw;j8 . fu worpbwi:re, 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 an axisk27i ,dgx uq ire+.rh; whose direction can be varied. In a region where a uniform magnetkd +2hxqeg.,ri ur7i; ic 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 angular speed about anp kx;mf;n-i01 dxu +vs axis whose direction can be varied. In a region wifv ;1u0dm+pk ;xsx n-here 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. tms loqhc7khgrhe41b 1 *u:-2
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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 abke ddy+67 lcs c () 7ja7nez2yo42mpyn $emf$ 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 magneticlsm. p x-s5xyc**pd)gl*+ kv w 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) isho d9 /,2+ 7nta6 um:;o(nzcbqyaojbu moved northward at constant velocity through a magnetic field that points +na;u2oa9oto/ z76qn,uc hd y :j( mbbstraight 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 cons,3g xrm 8rgqfqjft7 / 3gyd(f3tant 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 tec po5 lubc7u. aw7ftiq9/h8) ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutiywekcb82 jsbbkx0rx , 55l+y-ons each second. The frequency of thr2 0,5 cyekx 8b5yxklb+j -wsbe $emf$ 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 device usg;dlbjz c5zfu dqhj5at9 +)fp9x .u(e5 t(9 gjed 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 devij n3jbxjzpx,/m )lip)a.y+a 8 ce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more i6mim789. 8 od tgwpreloops than the primary coil thenmgmi8t9w.7i8 po er d6 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 gtrl op,5eh t -+6asjbgqa.70loops than the secondary coil thena70 hl jta-+g ,6.qotpbr5se g 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 in/5v 6 k en5a,ht2jcmof*8e4oztsje-kput

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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-vvmi + )yt*xt circuit,

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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 t 1u5xmwz,m y/ry2 i(kconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the kzyrw m1t m,/i(x 2u5yvoltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected incfr inln;(chg1,3s1 n series to an ideal battery of constant terminal voltage. (1c1cnn,s g fh;irl3n At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resis8 ,pbb6kvrk u2b umeu((,rua3rei /q-tance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is lh qe9qqu/pe1ox2 g(y4-;lg fconnected 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 batteryqddcltt+:e*9*t l za-psw 8r( . The time constant f+adr(8*pws czl lt-t *9:tqde or the circuit 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 battersrmrpd: xif48jb*: 8wy xu13ly. The battery is suddenly xpwf4 j* 3m8ldi8r:xr1:b ysuremoved 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 followinghxl ,+.m ybgj. 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 ay+hw exh6(h m:n AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an A0xf-k/2 f)oid.ae w duC power supply. In this circuit, the current0 .w2-eko d daixff/)u

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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 chang,38 erkdoi 4xxes by what factor when the frequency is trxdiox ,k34r8eipled?

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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 volt,+om8etsu2 j mage across an inductor is doubled, the inductive reactance of that,+ 2mejtum so8 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 vo4hnd n-ga,g 7 c1v r*3vtcle/9lpw8 :cwf zzk8ltage across an inductor approaches zero, the inductive reactance ofgknwwt*rp 4dg3c zaf,18l-ven h9c l/ 78zv:c 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 powelj2(gptmk*r( r supply. In this circuit, the current*ljpt rg(k (m2

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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 aamtq.oktb vuncg42 0;eq l/4:c circuit changes by what factor when the frequency is t;et2oa/qmqnk luc.:4 4b v0gt ripled?

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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 app u98 f i9hmi8 ey*p/fp2m*jwhproaches zero, the capacitivp* 89/hpfpeif mumw2i*9 hj8ye reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a2 g0 mqt34gx;y*aib mf RLC series circuita* bgx4;03tfyg2iqmm ?

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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 cir3zn(7ct(4wd izvkt2 d cuit 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 increases if R 9 u/kp jnc3ka*t15qquincreases. When is this s /3tqnk cu15k 9au*qjptatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incy45jx)k*fquwm7m rrsud 7:( wreases 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 cir4li0 hcw zvo1-cuit. 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 double in an LRC series circuit, the h ny n+g+*q7oqresonant frequency of th7n+ q+y*ohgq nat 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 ACws7jnm1nylc3 2ce8f 3fox( cp9+qzz0 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 circuit o4 uy/zs1btul.d j 92bzccurs 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 field of 0.20ont a32 /jn3bd T. Find the magnetic flux through the loop when the plane of the loop and the magn 2n/3nt3a jodbetic 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 magnetic f qh)7v+aibr 5jield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn brj7 q)5avi+hetic 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 dv2j 4 oli72kobouic5l)l2( wis 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 at an uiolb 2o2(j)c di2k 7w54lolv 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 adjo6 g;0j)pb q3yx0h oniustable 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 yh. veq.uxsk ao9t7,0 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 j ge8jfz*ej- 8jaa* r318 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, fin*jej az3egj-rf8a *j8d 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 m1s. n9ek9 ticazd1txr 7um)/with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ai4 - 7ii9qa*, nmx q;mrvdk08ewl:exmrea $0.20 \; m^{2}$ 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 wikqs2+4av cv8czavx i;g/l.v .ng span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field i ca/ ca sl8g 2v4q..i;vk+vzvxs $6.0 \times 10^{-5} \; T$. 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 ,14-ml paenre.0 m long rotates at a constant angular velocity of 2.0 rad/s abopa-rl 41meen ,ut a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops*k8q/nx wm9+ 0yylcmu and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofrrnx2 ( av4,xuf.vvw * 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 loop is:h25y - z:hd ecw-ci+x,qag uk 12 cm long and 8 cm wide. The armature rotates at 1200 rpmcx 5ueq-2w:y - ag+zkic:, dhh about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of e-omsdc6j (h1;t6hh sw m2mx*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 g,8t 5r2d fnfcgenerator with an output of 12 V maximum 8f d,t r5g2nfcwhen rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a ms vxn7, 98)xkew 5tlh5nucee9 :z5xtxaximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates j0 dpuge:h+nn7 viz-4on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor (v5ls1,b *sr;ean fsf b(nvv .operates on 120 V AC, and when running at full speed it genf1bs nb af(;n*(vl,svrve .s5erates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suea n bx-+fb23xpply. The operating current is 1.0 A. What is the start-up +b-fab2n 3 xexcurrent?

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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 38 ;ub+;dzekxmo n 6ijresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 m;nxd jz+uiebo683k; 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 r09*q +g0mvg w6flirrsesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spi +rsmv*r w6l9fg q0g0eed. 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 + .nhq iq.pl vt(ej8c9is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the second5-6.d d*sh7y avyjdp2i ai. wvary. How many turns are vpij.d a .5y d 2vhd7iay*-6wsin 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 9wg nq5hkr7xm- vzlg 3n1nq*: many turns are necessary in a 110-V primary if the 24-V seconz-3kg h l7w1 rn5q:x nvmq9n*gdary 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 coil andsv5 ae1pl ca(6z;tdd + a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currenp;e +6tas 5z (adl1vdct 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. Assuming 100%h+aeopu 1z5d1 efficiency, how many amps1z 1 5daueo+ph 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 transformer provides 7500 V at 10.0 mAsxa4hf+hgk .z35eq 2n7 ryl3d. The primary coil operates on 120 Vx3z4e.khl5a f s32 ryqgh+ nd7. 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 turnsn-i 7kc9 p s0rdeyb/l. on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applsr0bpn- ld /7k. e9icyied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turnc 3uw9qb6pvtgpvr*1s p(;, tis 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 prqtp,;r3w vu tb pp1gs9v6c*i( esent in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itsyw53quai03-esa /v4 :f qobif secondary has 200 turns. If the input current at the paaf 3f5q4w/ie vuobiq:s- 3y0 rimary 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 has 100 turns and its secondary --rr tbn n:9,kbqp*iidrc;6i has 200 turns. If the input voltage to tht9 krb-bnrc;dn i- i6 ,:rpi*qe 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 nnzcjx71zq7 *1s / xnd gm/gqo,l;xm:turns and its secondary has 200 turns. If the powerj gd/m smzgn1,x no7:x;n zlq/xc17*q input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces si sykrh a/5;7-v3piylrqn-) gpl 7g9 60 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 number of tul573p ;nhr-)r-ypyqis a/ v7l9 kgi gsrns 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 sv01/zw1fs +n4 nea skvtepped 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 vw4n/1 s +s1vk 0ezfanthe 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 usual 1j( y uzv.3fn2pap7nvly 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 transmission navj(z72pfp nv3u .1y 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 resu 5 jq8p9gk+ zzegwi5/istance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energgwu85jez+/g9i qzp 5ky 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. A geizpi/m,: xgl4nerator 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 transfoix,i4gpz/ lm: rmer 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 100d(:, d2u gz hygkvk3.k0 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 k huvkydgg(,.d :32kz 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 4lsm qh67k0om d7cwy6d0g5lr 1 40 V at 20 A. It is to 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 tk c1 r 67oy5shdmlld6mwqg0 07he 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 in the co, ucqaj)(a8p elma /n*debm5 7il's magnetic fielq,u5b ) aecj*8al(a m7/mdn ped?

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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 ( n,mch.hpix z:+ t+a:8fqw agand an 18-H inductor. What is this circu8.:,w( h+paifc:t amqhxg +nzit's 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 circuib+bpfa,xc4 :vhz;s(kwtp)q;jye/)z t 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 -sxl9 stg/ kh3zju44ogyg t3+ 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 thzy h( kli;j9i24ooj3z e resistance of the lakh ilyi;3jzo4( oz2j9mp?

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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 is tskzr s ,-)vx.fhe peak currens.r )kv,-szx ft 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 thwftv; *ft8o:a8d v:ey e power disst et y vw;8::vao8df*fipated 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 ymly;,l: i9o.pyqc+v -510wsx wlhi d e:7jiais $I = 0.80 \sin (240 t)$. 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-rm wrpm4t7y(kr,7zp( 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 resist0ge:xgg*dw0, .ebz,a j jf0om2e, wd jor 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 in4.hedol wt+ gp -/ lj/mb.+triductor 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 au wld4k/ 3kc2ex1hah-t 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have g9*7xk*nkla inlfj11 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 inductive reactance. fxjxc2i,7db 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 induze6o9(v)tw*d ng e4pb*mn /qt ctor when 120 V AC at a frequency of 20 kHz is ap/*4m*gntdz9qw6 no bp ev)(te plied 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 thro 3z/t6l1 ,- jbqpo*ca0u*9ixd g hwothugh 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 reactance of a 4.7-mF capacitord0o 7 glccu/vkzp77i3 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 capacitive reactance aime /(x;fzqdesz ,+c 9flm/- vt 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 capacitoeoh, o b( hn zbmzg):8s1n34crr have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF i(gipshh 4r ,u7xpo (*capacitor be 100 W?r,(s* u4 7ig hop(pxhi

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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 t6 wo. 32cilihmm5 g8h03pwj fohrough 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 12.0 Wq8:axntblq )9 ocgn5 ( resistance, 15.0 W inductivnq9: gnc (abo)xl5 8tqe reactance, 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 159 7,kv btki2rg00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci ,itk79rv k2gbtor 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 resu1 qk: ie+y wfyowv1*1istor, 20-mH coil, and 1.0-mF capacitor are connectew1vuek +qyyw *: foi11d 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 inductora-kjn81j yly+, what is the impedance an8yjjk-ly+1 at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is +/ /hwudgp kh cj)qq2ok6;b xz5y4/umthe phase anglekqdh+5k cjpu;4/gm /oyw/ b2) 6hxzq u 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 and 1.0-mF c(q (6dpmj-5skh b3 ;shxbec;f apacitor for a totalcepq6hd -js;(b(5 m3fsxh;kb 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 following capacitances is needed in series with a 100-W reo99ez1c2 mv llsistor and 15-mH coil to get a total impev2o llm9zc1 9edance 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 4-f3b8f+mc6 2ywx s hkd50-mH inductor at 5000 Hz for a total imp2hy6 3fsxcmkf8wd- b +edance 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 a57cmgae.8 z eet 1.0-MHz for a total impedance ofc8e7a5 mzeg .e 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capan v. 0mg)curfs42 iy7) ttf7ldcitor. What is the impedancgif.dr047tsl7)um) y 2t vnfce 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 1b7mbgbo m ;1;i.0 kHz for a total impedance omi 7bg;o ;bbm1f 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 10ik3)p ul mo y63ga5g(y-mF capacitor at 1.0 kHz for a phase angl63 guly (3i5omgk)ya pe 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 resis/ y;weiyw 0hml ( kh4dr6+xr,stor at 1.0 kHz for a total impedance of 4exdhr(l0 ,si ; hw4wmy/ky6 r+5 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 1yu mcj,i5p zr b7nc+-k53crq;00-mF capacitor at 120 Hz. What is the phase anrku p jbqczi+n 5,5 y;c7r-3cmgle?

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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 10: zit k9h-c)ht0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serith:c hi9z)t k-es?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a ohnqdv ,(1 ma00.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit? a1oqvm0(dhn,

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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 yaym.kf2mox6;wq1awd dj89* ance 30 W, and an inductor of inductive ;wy19 8 a fd x6qmamd*kj2o.ywreactance 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 containing a 50-W resicd8-)foelop 1 stor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6o dc8f)-1elop 0-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series wiab 6n 0b,k0a79gbuy:*vwlu z dth a 500-W resistor for a phase angle of 0u07 nvg bab,9way*6zu :ldk b$40^{\circ}$ 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 w-(o wf+to,07cv ad os1t/rz whhat frequency should the circuit be driven in order 0 (7to,vtzwdafcoh rwo1+/s-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 witbhb1d2(pdil* nhm 0zgi r0( r3h 12.0 W resistance, 15.0 W induchz bl(n(d p0rg3hid0 r*m1i2 btive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is ) i ,hhrdt3qpro6 .wo l*b:5ai$63^{\circ}$. 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 impe0 9 (iziynrh ,1trbm,rdance of 60 W and a resistance of 30 W. What is the pow,y z1rirmrh( tb,09iner 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 *2dqy owx ;gai:o))c p s1jj5xRLC circuit containing a 50-W resistor, a 1i xwq ygd5)c:a1 j;)2*posjxo0-mF capacitor, 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 1.8fhu u:l: /nnk0-mF capacitor and a 15-mH coil in series?fluk:u h/n n8:

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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 1*fiv4w-ho5ibqo kuhs 1w,- ca 4.7-mF capacitor for a resonant frequehv-uchoi, kbsq*w4 5f- o11wincy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH injet2fc. av d,.ductor for a resonant frequenjtv2,d..a cfecy 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 plan(d j/.yuc7roee,p y ,ced in series with a 30-W resistor and a 40-mH coile7nj(/ ydue, .c,oyp r if the resonant frequency of the circuit is to be 1000 Hz?

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