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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 magne/ru kp2oby4t;tic 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 inductio4 9i-jilu bd 5(h,f k;e+8rfjb o+xdzwn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a u)yt4 z+08 /qbiptfw fcoil produces what kind of change on the0fuf+ tq/ yibtp z)8w4 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 through a loop xt4uy7p pkwdd* +yvw70v9i -kof wire produces what kind of change on the ind7dk7-wtd w*vy4+ 09uivpp k xyuced $emf$, 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 wire2)0 ,gtxhg kue produces what kind of change on the induced t ,xugg2kh0 )e$emf$, 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 fiecqb- 0 iputad4c ,mg4*ld 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 of9pb o9yzhm j9*ieey-g s8) v25fcrdd7 an induced current in a conductor will be that which tends to produce which of d p y9 i5dsf9ye)2-vzbm o e7*rcjhg98the 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 above itz1g*fu6 klk:b s center with its north pole pointing down. The stationary magnet induces (when viek1:lk*bu6zf gwed 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 above its 1wwa.92-c rbd3ar rbx center with its north pole pointing down, and released. As it approaches the coil, the falling .xrr3w bdac1a9r -2bw 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 i2qd ibc lw .+l+db2sc6n a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed frdlibc q+c+w 2ds2.6blom above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tablead-x-z vm5 -6e 7s2))qkjhcrm ysfc. x top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger.ms)k5cc .y-6 xz ) xrsm2fdjev-7ahq- When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tam.sv2 gnq, ng,ble 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 curregns2.n,gmq v,nt in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal t,. klr;s5uz :zkvsx +m-n6t0 nknxu/zable 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 cu:5znsnm;k 6 ln-u /0szkvk xuz.xt ,+rrrent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fi+qisy.x rx)rhxze/8+vr(gzz )l4 ij k;jw,v2 rst. As the north pole ej(xgq8hi v/y +;l+2)4 rr) x.,k zzs wzjrxvienters 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 gzundy+ 7ih1yt) :f-n is rotated at constant angular speed about an axis whose direction can be varied. In ) dyf: yz1niu t7+-ghna 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 angular speed aboutucrjz+9 h2 iv,xywhw2-d f,5o 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 loof j2hr2dcx,u9iwy -+ 5 z,vwhop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.d sg mopqmp8/eu6e; :- g)j)gz
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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 anct b(en+t3qvm l/ 2pbe+/g jr- $emf$ 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 magnetic o. i;e.ci4 j)dcdebw :m xp1u8field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at c r46ddapy2hi xtyej (*-m .7 znwto44bonstant velocity through a magnetic fiib e7dja*4ry y2pmdt 64z(wxtn-o4h.eld that points straight 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 cos p(t200fk zxknstant 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 transforwmi*q9fh1x x5:ynm -cms

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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 revolutions each second. The freq/gvc qp;b*x7tuency of the7vtbq/ ;*xpg c $emf$ 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 used iqt+x(s:3rc l :pgoq3to

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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 devn.x8eu8t y10u3l feroice 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 loops than the pvl,d a(k,fg +wrimary coil t+vw, k,afl g(dhen 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 7kcy tjw 6l8/pg*ku hp. c1wp8more loops than the secondary coilhpu/yp18c jlgt k7kp6.*cw 8w then 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 power3 2fnwp0gc fa) 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 circuit5 o o2kr1j.)x uhef1-tyrgj3w,

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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 conne a 5j.hpkr48u jc1 n5gj:w h6aykmsf45cted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acroc 1.5ka4ph8jw6gmf 4ah5 sjkyjn ur5:ss 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 in series to an ideal8k,gx: foo oe,h1jg 5yx 6kzyf4+mxa ; battery of constant terminal vo:y o+a4hxjyg16k;5m , ofxgf xoe8 zk,ltage. 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 isgkwdi 987hj2 a r5;fo-jowt+nductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancon lw*-wbrhwp p7a y )q f6la)a*4zo,*e 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 batterd+ktn2v j(ssag g4t, ;y. The time constant for the circu(,gdvat s ;jkg2+n4s tit 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 3t6/( xpp(a idpg8 cgebattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the ccpe p/ g(d6(tgpax83i urrent 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 the se 1u cse(u jr22e2v1gvv3v;fkame 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 th1v*o yn(gceq d 8pz8-b 2tsvy3is 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-o om9np 45mah. In this circuit, the currenaopm-54mn oh9 t

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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 c( *waxl1ly8(k.ebvyghanges by what factor when the frequenckl xe1l w*(b.agy(y8vy 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 acro7 w(h0c lfh1wiss an inductor is doubled, the inductive reactance of that w icw0f7h1 h(linductor

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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 tc *ydmo.rdgf .2mh*b 4he AC voltage across an inductor approaches zero, the inductive reag. f.yd4rd *2mom b*chctance of 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 .d2 keu3*svlzecy) s+power supply. In this circuit, the currenl3+s. cv)e yzsduk*2 et

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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 g/:) vzei6tlr circuit changes by what factor when the frequency is tripled?l :)gtrve6/z i

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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 approachk +0d:nmjifmv .d)u3/err;i yes zero, the capacidfm) ./:dm i;rnujeyi0v rk3+tive 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 yvirhq gx7aft)0nr( z5(yx,(. b b4 vncapacitor in a RLC series circuit?fy70bzb(xh v i5yg.raqt)r,( nn4x(v

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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 (cgte 5i1r.b1q+tkj71wb g fe84u irwRLC 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. The impedance of the circuit ik 1o ptl;jdz.*ncreases if R increases. When is this statement tr *lkpj td;z.1oue?

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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 circuiv fptu8x3,l)s t 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 b4 krvs .s/lk+4el: fijfiyo 1s7wl( .circuit. 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 capacitaicbi-qcq67sir nbd+ ; h(yh6(m7u /wrnce both double in an LRC series circuit, the resonant frequency of th7 /; hh6brniqryiwc(6(-cmqbd 7 s ui+at 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 ap +mvf3d s +f+o;pf1giue1 c9*ue gin*oplied 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 cirmra,0d93 fs mlcuit 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 4 j3;keyki;h-j1 aqlt9c y y:zrotating in a uniform magnetic field of 0.20 T. Find the magn3; cy1t:l kjyj;ea -y9ihkqz4etic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiu*p:6dh -jn wjrs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the*h6nwr-j pdj: 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 rotatingjvr3iak ebq13jy y2e uzssko*+)7+5 t in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the +1k y*) 3iosrqks 5jevbet+yujz3a 72loop 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 aj+ vlqk 9v/ubjuay1/0/yra u 2rea of an 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 ekcx; 0+*y tgi*,tw;zpuzy( jfrom $4.0 \times 10^{-5} \; Wb$ 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 turnsjf kmwd9b. /5h of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the a.9dkfbw jm5h/ verage 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 m2 6ti;. czlmeykm 32wwith 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 aoeub/ r5h+0b 6a*xh9x jxgf)nnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a loc 5u 7u42hb(ynnaw:mft ation where the downward com2 uftwn n4uby mh75:(aponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulw.j5w8ohoh y/+-8sj 4gp iabpj a+ fj)ar velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant m sjpaow8 fp.gai 8yjj) owb/h5 h4j++-agnetic 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 loo+z 5l8xwkzbj(ojuw36u e m v++ps 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 t 5+uy, f/ra vxpq)m4iuurns 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 loop is 12 8 wlq m57u w9o*pk5s2w8ooco. w ixr(ocm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long siwc(w8x5olwu5 owso 7iokm98p* .rq 2ode. 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 bwm j-llsx2fcm0 9.g0y9u 3ucof 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 ACl n5yt7x3b8yz generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of x58l7zt3bnyy0.050 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 generatora yb;a9 y.*, evkenc0b 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 motor operates u,auwio 1d( xut1opcg zj+/) 8on $120 \; V$ 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 repv2 8a0sl9hu.ny+hbnsistance of 6.00 W. The motor operates on 120 V AC, anluh2b8n .90 +ph avsynd when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power qw.uo 2hqe c *0m oj9-u whk)g;e:4jbksupply. The operating current is 1.0w kw;kbe )o uqo*h40-ej:hu9.mj2 qcg 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 p(c 6)kar lhbugf/wh:cd c9.i2ower supply. The operating current is 1.0 A at ful2h6c/9ibhucw lf: .ark )dc g(l 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 i njq,:e7rxcgu9 w) 1i7z,ds hps connected to a 24-V power supply. The operating current is 1.0 A at full speed. What i7eq1hsd 9c,:u,7pi zxnj)wgr s 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 rs:w8mcw orwo km* mvln( )8m6kg0 6c .dgtx0t)educe 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 tran)4u/fy hh 7pe1no vi uy0m8p.zsformer causes 14 A to flow in the secondary. How many turns are in the secondaryey8m /i 0vy41ppoun. h)h7zuf ?

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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 ( nvo ybvve/,6shdx; x6vui6-110-V primary if the 24-V secondar(hs i- vnyvx6,;v6 /udox 6bevy 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-tuh,a2jp.fsbw m ;3+*e aqcdl+irn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whatpwe 3cad+ i,l2s*a jf;+b.mhq 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 transform5gpn/4w kpfp ;bv vw)9er. Assuming 100% efficiency, how many amps at 24 V can flo)/kppb;wgpfv95 4 nwvw 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 mA. Thla/d(6m tkhl mk85z/q e primary coil operates on 120 V. What doesdh5/azq 6mkl 8 t(l/km 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 7 gilic8exfbf:f+7 )z 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 voltage is present in the sec7 f8cig7)xlf:z bf+ ieondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer2 4xbgndp rsx*/ i5ao 5(nbbw+ 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 primarson52n+bgd b*pr ibwxx( /5a4y, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondaryvd2yx*i ywx qi7:b2q+ has 200 turns. If the input current at the primary2: 7y2qy dbwxiiq*+vx 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 uoo1y ie2ow)hv. n.d0 secondary has 200 turns. If the input voltagdeouowo .)nv1h20 yi.e to 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 transr zfju d/gr5b,0*ja( cformer has 100 turns and its secondary has 200 turns. If the powerj/z grb, dca(ju05 rf* 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 60 m8kqj-cjytpyc i .11: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 turns in the secondary if ccqm18:ykj. ip tyj1-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. Tg3j47qdi9 zb1g6z q 9qn1k hhthe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find16gqb39zdj9qz 4 kh t gnhqi71 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 besa7;z9unu1 is usually stepped up to 4500 V by a transformer and n;a u s19z7buetransmitted 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 low,sbwmycu(wlpp33gq0 + 7ka 4ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were+s yk cb,p33pg07a4 wqw(lwum 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 lidn yp15n+g9q ittvfda(o( 35q ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. Ingyf((9+n5i doa p5tqtnd13 qv order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wz3wq. qj;r 2d+b*wwbwould be lost if the power were transmitted at 300w*r;.bqj zbd q w+w32w0 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 broa+sqm0 t d**e transmitted on a line with resistance of 0.60 W. To what vo0stqm*+ardo *ltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coilh+4dil3 ,ujer 's mlj3e hu i,+d4ragnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What iljy-(f g-py f(k-a+l vs this circuit's time cyj(l- a ff-v(yk -l+gponstant?

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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 ush+7gd d*o 6ean AC circuit 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 120f 5fo0.c 4 x*x+hjum(gatzt ep +gn44j-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 1jz cw68+ h)wtn20-V AC outlet. What is the resistance of the lamp?) w8tj6hcwn+z

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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 thed.3bh1cu4 yn5kdz8r6 1prel -bioze ( peak current throughe(zd8-erd4p36uc 5nbzl b11k.i yhro 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 conn asyj9kq5xuy ;fftl9vnwp2, 8/mg6k 2ected to a 120-V ac power supply. What is the power dissipated in the py9g fk5 8f;ty2lq /ku msnx 26j9vaw,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 hd)3jz )p4s8 rno*vesp 3j2axis $I = 0.80 \sin (240 t)$. 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 resily7xeiycm ;ecjf j5m8 /p;f 56stor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i xx85oskbhg-vtie5 /b45:tmss $I = 0.80 \sin (240 t)$. 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 o lfvgzn79z;*mw, k:wof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1ev/pn(:aafv h,**vl a000 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.jsn: r9+(okwguiet;ra k)* k(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 inductive reactance atilnjy r5u73k (2hff1yhkr3q6 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor x6e mlc;js,jgoq *0 t4k7 j*imwhen 120 V AC at a frequency of 20 kHz is applied to itqjl4egt*,6jm0 jxiosc ; 7*mk?

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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 throu kps6+ xdb.2rh0qj+l/ qa )voxgh 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 capz 4f)9 2h+kocqm6ywn61ukxxgacitor 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 havoat(2 b d4exe,p65l jzhflp*(e 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 capacitor have a reactance ofztga;smp35/ q h-8jpw 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 x9 b6zj(yzkk:kn t4 9ugxg3)hof a 0.010-mF capacitor be 100 W?kgxu 6x9 :h) t ygkz3n(4jbzk9

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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 capacitos7)5s0y *phdm )l sqcir at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0iy qm dm3(*qa0b(e/kh W inductive reactance, and 10.0 W capacit(0i khabq /ymedm3*q (ive 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,tyvk ; qvb a10olb3-r 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ;oqv bk1lyr- tav0,b 3series?

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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.a: ,qe*nljtf82nipfe +*uo e, 0-mF capacitor are connected in ser t*aeen jpf ,,+uqone28if l*:ies?

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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 wm7r9x)( kkw*e gpz/-z ;kmet oith a 20-mH inductor, what is the impedance at 1emtkz) g(;r9z mk wo/e-p7x k*000 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 i4+9ylooyh la / :ik/vxnductor, what is the phase angle : 4y ohi+al/x9/yoklvat 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 2+ d n;tdpy ,ask.bm8ebv(mzw2 :* x9bf0-mH coil and 1.0-mF capacizbda x 2kd+p.b; :,m9 bvmy*( wt8fnestor for 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 following capab8 eh2a/ ij-rrp1sf4;ce ;i ogcitances is needed in series with a 100-W resistor and 15-mH coi cer4 frgj;i2a/h1;ep8ib -osl to get a total 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 seriwk +t1ah295m9lhprbtes with a 450-mH inductor at 5000 Hz for a totalhwk+9mr lt2h1 ba9p 5t 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-MHzj.6mtn1i o h:z for a total impedance zht.i1n:6moj of 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 id c (+b,og8hyou4 pmme/+9 spseries with a 20-mF capacitor. What is the impedance at 100pe( muy ms hcoi+8o dp4/9g+,b0 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 seri dta3 iy(h;(eyes with a 10-mF capacitor at 1.0 kHz for a total yth3y d(ei a(;impedance 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 sezu)q(1 xji 0uvyd:l5 kries with a 10-mF capacitor at 1.0 kHz for a phas 5k1udxl q)(yu:v0jzie angle 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 11jw nxy:5xqrresistor at 1.0 kHz for a total jxrx1: y51qnw impedance 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 4m oj-l9rz- tuc 8-7f eu1ggdiseries with a 100-mF capacitor at 120 Hz. What is the phase 8 lfmug9z-g4 d-17-oiujc tr eangle?

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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 100m suwbll2uh3p9p 0zr7 2bn1 7n-W resistor, 20-mH coil, and 1.0npb 9lbrnls27uhm 32u wz01p7-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 100-W rmz-xzomtl 5 )8esistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz po- 5 o)8tzmxlmzwer supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance x)+y nnqu0fj)30 W, and an inductor of inductive reactx)jn+n0uq fy)ance 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 resistor, a 2 nmu.:p6lt/q onh o;l10-mF co;u/lt 26q.po hnl mn:apacitor, 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 necessary in series with a 500-W resistor for a phase al0;s*or,z6t ; jhmuitngle of l *zu,ts m;o hjit6;r0$40^{\circ}$ 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 mx0 p3m.7oqpl6q1 0v:trk zvwuoo0rd- F. At what frequency should the circuit be driven in order to have 7ovp6 r3po-z 01 x qtw :uo0mlrdvk.q0maximum 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,e3lwdk-k2y 6 0*joth q 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 6q o3td2hk k*-ej0lwy120-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 isj )begndbl5sqxf 5(; 1u vr:b3 $63^{\circ}$. 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 eop m *2gj.5fq(ldvwg ejo;42has an impedance of 60 W and a resistance of 30 W. What is the powg*p 2;fw loeg5vqmjde(4 o.2jer 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 RLC circuit cot 69izevnx66d (,st tkntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wttd knz 6x,6 9sie(v6then 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 1q:ax: b(8 8oc3vyqrrq 5-mH coil in series?(v:rx a:boqq ryq388c

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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 seroe/4 +knvn:hsies with a 4.7-mF capacitor for a resonant frequency of 10 kHzvn+h:n /ko es4?

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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 aa4md8 9ywcpf. 3.7-mH inductor for a resonant frequency of 1dwam.8 4fc9yp 000 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 30o.1m/h w 3 fvi9awqvk*-W resistor and a 40-mH coil if the resonant 9a3v/v1*k m wqwihof. frequency of the circuit is to be 1000 Hz?

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