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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: 游客未登录  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 excep b (4chf-*e7m 9mrl kier0e5ult

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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 states4bx qh6m xfa y:or:x8zm3m;a ur-vve1sd54;y 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 e 4 so8 fg5h8rl74ogzla coil produces what kind of change on the induced gsleo4h7 g4lro88 f5 z$emf$, 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 )1 ne wv,u8radthe magnetic field through a loop of wire produces what kind of change on u1wna 8)r edv,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 ouhw) xx xe(ya*kjte;) 0;9hwsyhu0. y n the inducedkj h 9su e. ;)waw)h(u*xyxx0e0thyy; $emf$, 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 magne) vdmo*kw +szkvn+aet;f r 36-tic field 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 dh3pn0mwx*7g sez/,s0 3mds5 cucrf6direction of an induced current in a conductor will be that which thdusgn5dfmmr p* 0,c se3xz6w3s0 7/cends 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 fmvtd g7e 4n/2magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from 4td e2 /fngmv7above)

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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 abover6 qxcphw.uu- sl fq-4:9xxm) its center with its north pole pointing down, and released. As it approaches -lxf:w uqqs-hu .cx x)96m 4rpthe 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 magnetap.p 0ai/ 34/+ +affwsolp ylgic field vector points straight up. The magnetic field vanishes suddenly. When viewed f4pl/fy 3sli+ /gawa0p .+oafprom 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 table top in a region where the ma /z473nvi*hg b9nruod gnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the vg* db/ 9nir3o7zn4h uinduced 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 horizonta rawt;-wkw.07 eygiq9l 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 a gr0y; 7iq 9tw-wwea.ks 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 table and carries a)ms igwm+ :1dv6ifs6 en ever-increasing current northward. Two coils of wire lie flat on the table, one on eitf6 ivems)d16+sigmw :her 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;d0 9.fryf wej ),vrpk loop of wire with the north pole entering first. As the north pole enters the wire, the inducedw,.;0 rk drvefypfj9) 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 consf xy(/qxi2 uk)tant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straighyfu2k xq/()xi t 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 angule4cpjsm lr8, 3:y5tyl ar speed about an axis whose direction can be varied. In a region where a uniform magnetic 5:,ltcpy s lj4e3 8mryfield 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.i a4-y )ececzeg9/c ,p8srwz:
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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 d0*k+ppvc .6qv: jyrkan $emf$ 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 magn.is8 n ;ma 75ghoejv)z wgh*9unq+b4oetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward k0qby)wmazf1-qg+pn nh .:7 cat constant velocity through a magne ay+z :bfqqc-0gn 7 n.hkmw)1ptic field 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 rhlqxt d.x v5d/ z13ty7otates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatormhvw( k /l)r-9d,2dqjijcbt1 transforms

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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 frdyyy m7h382njz/ yn br8 y+t,mequency of t ny y z/ y7hmj883bm2+dny,ytrhe $emf$ 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 dev6ca3g o qpsycrf-*l 5,njd4u+ice 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 de bnwg*j/b3 zm3vice 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 tha8ui ycp )3dk mb0tnkv4e zya)3.42jvan the primary coikv yuj ))z kb2npa33e0.d48m ivcya t4l then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coibs u1 0sfxi24il contains more loops than the secondary coifs2b1 x 4isiu0l 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 powex;agk -,hjaxhc.4 ,m1uy5a or r 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 circuitvjd/nmc 1l-a;8r*rlexg9 : joy1e os; ,

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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 c;nb .b)o) rhu)k zzy9zonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrozo .)z h)r)z ;nukybb9ss 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 connecosv)s;3sd- bx( 9eyuqted in series to an ideal battery of constant terminal voltage. At the moment contaexsov)y -9 ( s;3qsudbct 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 rup b+,o)xgym r v*jx -yf-7;jand 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 resist+ xe58us7b, f hc-cicvance 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 ixh 3my+u x2b9cn series to a battery. The time constant for the 39uyxb+ 2xhmccircuit 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 lne*mnqw3,1 cp*a 7vgb9qv:) njes *yare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for t9q* e :evvn wn,cln*a1bpymqs )g3* j7he 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 haveu7 p q+ag1x4gl 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 connecd;wwhn . o)0va lytm ney7293bted to an 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 connectecavvp*r ( ww)d89 zp6cmdv88qd to an AC power supply. In this circuit, the current pr*6dwqcc v88)zvd 98vm( awp

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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 changes by what factora, qwv*yptcb(ev-w bmqzz7+x/t( 7+w when the frequency wc w7(-yq7vx,* bm/(+pbe vttaz +wzq 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 a8yus2i 058jam ia fce+cross an inductor is doubled, the inductive reactance u 82+yac 0f5ae8m sijiof 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 approaches zero, the umswip8 -cyb ;))r+osinductive reactance c+ rs )bs);-opm wyui8of 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 st*hlb suepo t( 9i375pupply. In this circuit, the currenthbtp*3top7( i5 s9eul

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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 changes by what fu1p4w6zzys . uactor when the frequency is t1.4zsuu w pzy6ripled?

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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 ths5sfby sa 2fmpc2 t* ;iz)*u3ne AC voltage across a capacitor approaches zero, the capacitive reacz2pssay*cb3m; utf) isn5f2*tance 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 voltage no,bz.axhm;4s of the inductor and capacitor in a RLCbhoz; a,xn.m4 series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is definedr ytx3yn*is0,m.p 5fv 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 2 yd aglotdxb+,bdwwc ww*3)*l1 j9o;the circuit increases if R increases. When is thi13b9 bo lyjodw*d ;agc+xwww)t2 d,l*s statement 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 increases rlv2vs())nj j 6sd 5 twq:o8gqif $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuitwr0*fs0s2z6 ,d p 2 v8 pzshymu5qec3i 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 anvwtp- mfy z7.(,jhnr . LRC series circuit, the resonant freq ..p(z7r-tw,hf yvnjmuency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is ;63 ara5eybwg wbv38ur6 ,c gig-juq0driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occutex b0r 1.(s gn ug*qv3a8fb*grs 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 -jh+;ud- ot1d*q;*dk q9 g3obxadhhpa uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiel;-;q hdkpxaqgdb9t* 1*-oj3 uhdhod+d 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 rnr-0 m,9a d a5,i qi1ijmrxnd:otating in a uniform magnetic field of 0.20 T. Find the magnetic 9rndm-njd m,i:qr 50iixa1a, 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 0.10fj( xqo; joe:eq 2)aax4eu38 k m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the looeqeef;:2 jao)xqaj (xok38u4p when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable s0xmjzqd1ie lf0(k,7* mbt 4sqingle 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 chaa om- *(2t2bxqzx dx8rnges 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 witeq);gl35gl fl:so d k2h 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 changge kl5 g;of2dql3 s):les uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turnjbp;9qy9 vb )/i.m gzks 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 ae6p,w c4hw so/nd 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 horizontal5u 2.byawl+o/7eyxu mly at a location where the downward component of/uo5e xm b7y.2la+uwy 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 r9p0 k1ze0) ljxt*h vlrotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic filzlhpx0*e9 j)0rv1tk eld 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 * s/qwitp- ,vp:wp 7zda 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 0 0+ws ;ebp(mccx9wvfof 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectang6rlu5u2si pr: ular 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 perpendicular to the axis of rotation, w rrliu 6:5u2pshat 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 t.g ,g47.ar0t y byhqt 7aqgjl,urns 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 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 co,+ubwu-8qyu r2 +ypb wnstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil2yw+ yqb+urp ,wu -8bu 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 maximum .5d)ugjx d+,zn8(dg.opy rk3kco 8es $emf$ 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 d0jvw*nj7nfte7, j1p motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a(pil +7x;,od3 flbjje resistance of 6.00 W. The motor operates on 120 V AC, and when runnlp (+d7 ;3ljxofjeb,i ing 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 )9 by5c/m drl2 97uahyvbl )ywpower supply. The operating current is 1.0 A. What is the start-u)u5yl)ay9b/ hbcy w9v2 d7 mrlp 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 resistancee,pdzrkjbt)0i k3pzl.4uo :/ 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is theb3l. p4zi:) judt,ep kzr/ko0 back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sup u, plqhv7wg:vsvj.3:ply. The operating current is 1.0 A at full speed. What iv: q3 pwshj.v:lgv,7u 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 reduce a pu,le). /wxhk 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-turm:fsouof,b,+;s9p tcev j jy s-0 )xi7n primary of a transformer causes 14 A to flow in the secondaux0 j-syspj b fto+ ,sem7;,ci) fo9v:ry. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many tufw-2qcqeh 8+ tj*eg- hrns are necessary in a 110-V primary if the 24-V secondac*geej+ h-qt8wf q -2hry 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 5(agcn,n . )s-1bxfldxf; s7bu00-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3g ,;(abu 1xlfnxdc)-f.n b7ss.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer.ctj-w,pt8tn y 41b/vn Assuming 100% efficiency, how many amps at 24 V can flow in ty4wb,p1 /ttnctn8- jv he 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 transfor ,kevbrh6r*p: a k)iy7mer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doesi ) br*h6pr,k 7:evyak 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 fd*q .w7 zqb/fj;pm uc02ob7kits 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 thj/.wup;* q0 b2obk qdc 77fmfze secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sef3n-5l bl2grk condary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondar2klfb5lr3 -gny?

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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 secondary -fvj *xcx+w wzc (74glhas 200 turns. If the input current at the primary is 100 A, we c wz*-7 wfx(cxvgj4c+l an 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 mfmr(v*hl kd8z6b g91and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltarmdblm(9ghkz1v86 f* ge 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 hi- r vlf5-,erwas 200 turns. If the power input to the primary is 100 W, we can expect th,vwi- rf- 5rele power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. w .:2vuu1 +n pw m0e6lv1eekdaThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancewdak1 v0u2w6npm1 uv e+.ee:l 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current : ca;:tsg4xan m xzn0/at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power li:t/0m; xnz:sx ag4ancne 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 current at 120 V. The voltage is usua-;uns tmvt , k2o.m.tqlly stepped up to 4500 V by a transformer and transmitted through a power line of total resi.nm2u v qt,st;mt.-ko stance 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 longkikia0 k*sv 7) 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. siiak7v ) k0k*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 hauy ;xh3 djzl*wp(/ldsh+0 . +a-d jjbas 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, tjy/x l.ubjjps hwad;z a hd+(* 0+l3d-he 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 beee:t *or;) m/owu ae.d-fw ,yx lost if * yo;ow-:,/r aeeu.tf) xdwe mthe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generaw3hxxi-j/)8d*b ud bab.b*if +l+e hetor is 440 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 the power loss in transmission is not to exceed 0.010% of the original powed df/bxa*jh+w li exbu. 8-hb+3* )iebr?

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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 the2em incy9(gobu* eq+0 coil's magnetic field(*0ue nqio2y gem9bc+ ?

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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 n, nlx8h1zye0 18-H inductor. What is this cy len1n,h0z8xircuit'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 circuit where the rms voltage is 120biw , 91-u v5xvzcnw+g 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 into2zuqe.bw7o jm w8-o7i a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the rewi;sh1y yxc*wm+m-q, sistance of the lamp;cw+w1 hyx,m-qs miy*?

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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 12r v,e0+c 1z;ilva6ft,9v u jueiyp9a(0-V ac power supply. What is the peak curre1i;a+v6yv 9ei p09ev, (c,t uu ajfzlrnt 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 thgk. 2o-fzo)7b/zmmhen h7h8 me power dissipated in the rme/zzm )h-hoh g2 onf.mb8 k77esistor?

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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 isj3; k h:4 vl:un nlqhc1bszd8/ $I = 0.80 \sin (240 t)$. 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 )e,(s8oaq4 l jei2dds-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 resisto/b if7 8nwk(wsr 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-mn9gcxdeapw- r i27v/q)iyc( ,H 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 reactzf ws:kp5c).rance of a 2.50-mH coil at 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 14.0 W of il6r .fy n*wwqb +)zx8knductive 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 nomnwk/) d1l9tecessary for 157 W of inductive 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 60-mH inductor when 120 V AC atd1vgvct +0nag7r(. ,.scmyjv a frequency of 20 kHz is applied t vcr.j, m c.vvts gny1+g7a(d0o 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 ttr)vtl-zb dp: s895p7p ai p;wo 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 rea :sc)b:fwkilnf+7* s,)ld sypctance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor i wrv7xni,nh7f6(t :m xs needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 W?lhh:zuq.+g5o 2-rl-z l4guxb

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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 capacitivew)q:1cn mn0t:liik krmp6b a 0bj930s reactance of a 0.010-mF capacitor be 100 W?bkn qb)ir t6001pwan0s: :jmlck 3 m9i

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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 capacitor 4lhj y5p yax:2juv7ngo253u+nxc7gp 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 serhvx78gb+m bcwcq yg5 0te3 iaiw3/2m 9ies circuit with 12.0 W resistance, 15.0 W inductive reac3 gt80aeih2w c5bm3x+9 /qgbicw7 mvy tance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 /9 .zqm(j-ynbmss7+ sbhzo ;( sq; coyHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriescob9ozysszq- 7 m+. ms /;y(nqbs;( hj?

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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,2 h*turtsz,z*,qw3 mssdd k vu4;h34 n and 1.0-mF capacitor are connes kw rmhdshz*z3s;44ut2tqd,v u,n 3*cted 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 inwhmuqmtubkf* o(j +j,). zx,5 ductor, what is the impedanceumzjkjb oq,f)m,.t(u +h w5*x 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 is6 (t vy2qu:ds ffafzxa9t a)1ridv7/ 8pr 4xo/ the phase angle x9 at )zrady1xv fafdstuir8o6 /4/f(:7vq2p 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 coi o)vd -+s fnsxi .bu.mr:3xbw .cq61vgl and 1.0-mF capacitor for a total impedance of 106vx). .+icf-g1bqonsmv sdbr w :.xu30 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 ilkzyq2 vg(4) xn series with a 100-W resistor and 15-mH coil to get a total impedance ofk y(zql gx)24v 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 inwm*)ik qn5+ss o ed;x0ductor at 5000 Hz for a total impedance w;om+q5 kin0s dx)e*s 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-l*9od9e+(cu w lij1th,uwot9 kW resistor at 1.0-MHz for a tota oc (9w9l9+uu,oitwlj eht 1d*l impedance 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 series with a 20-mF capacitor. What is thb6 fsymlh/b/p +l 5ewo1uh9c *e impedance ah/6h5be u+oyc /bmp sf1llw*9t 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a tota p9*m9o,9j1 i ajwcm * mlbm0jbc(rei/l impedance of 45 Wac 1l9/0mm bmjm c**9 ioj9epbri (,jw?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for bn*t d /q-q:qh4l;jpya phase anglen-pd/4qlqbt hjy:; *q 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 resiw+ x(djd5d3we4a,zs ustor at 1.0 kHz for a total impedance of 45 ,x wdj5z3d+wd4u(aseW?

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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 1gx z: *u6ucy07/0+dvv rybyg h00-mF capacitor at 120 Hz. What is the phas+g0 cdhr6yg y:u0/ uxvy*vzb7e 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 imyk49)nwhgkl(: f6nv f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar 4flw6:ghmk n(n y9)vke 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 ate0k0nf fgx72z v z19x 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected tz2 7fzkv91fxnetg0 x0 o a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacit au-x:nunv(x3 or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connect xu -ax3un:vn(ed 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 resiv/2a :/qshy psro hf0.stor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power ssrvf . h/ s2pa:o/0qhyupply?

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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 phas tz8p*3c *)y od.yejhue angle oyj p8*3ed)zth*co.uy f $40^{\circ}$ 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 ha0b(6gjk,0x ps ;:eybtw gou9* ffs+t ls R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have xg:o*plyt0fsk ;9j( usbbe,w+g 06tf 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 outpu ohd a9w,k5jwc(h(dm b hfhx1/cc-g4 2t in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit5(hjxdw 2hgc1h4 b d/k f,(c cwa9hm-o 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 circui,u ;unoa e90ait is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30bz/ 6awfca+*0/fz (s kqpcy*q W. What is zqzaw f k0**/ qa+cy6scpbf/(the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for )9 qonzut4j8 i;w15v ujyo jo6a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.4;jjj too y4nzu8ui5w)v16 9oq5-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH rt 0uq(,xvbzxgw jj7d*l e*.1coil in series?r.( g*b uv1 zxx0 qled,wjjt7*

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor fov )frl+ ;ck ik:5dut:cr a resonant frequency tik5r :cfkul+d)v ;:cof 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 inductor for a resonantdoww lv8h9r,6 frequency of 1000 Hzvhowlr68 d,9w?

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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 serie74p eim.3 yil2 7vmglu.lkyz;s with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit imm;gkl.ie yl 32.y p74 izulv7s to be 1000 Hz?

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