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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 magwk*z4aem1a9 qziukis( n;;uq5wi u 2bj)cr2 .netic 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 inductionxxrtd ( 3ho;r4 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 loopsnomhfyybd 30.2hkg+.j;/i f/k ,cdma of wire in a coil produces what kind of change on the induce 0;ynfoa/+,gdk./ yh3m mbhk. ji2cfdd $emf$, 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 magneti9jg d:vc9n:kwr /b3qmc field through a loop of wire produces what kind of chad:v9qmc w jr9gk/n3:b nge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces wha ,8yvdl)sk38l thva ;dt kind of change on the induced ;3ya d,8tvk)vshl d8 l$emf$, 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 magnetiek9;6uy6ns2db f t-dmc 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 direction of an induced current in a conductor4h;h/yba g. h(o ew.wb will be that which tends to produce which of the follobhwy(h;4who ae. b .g/wing 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. ld2ovzwtx2 fsw/7+ +d A bar magnet is held above its center with its north pole pointing down. The stationary magnet indu+22d/ 7l ozswxf vdw+tces (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 magn.hhxm6g*nf+ x-qbw /xj bl:(yet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whe(xl/h* bxyjmwn:b 6-fqx+ h.gn 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 l*w922zjatkh region where the magnetic field vector points s9zwla22 tk h*jtraight 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?

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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 fiokzxyfd 2pn-.:yh myt (lffj/*kf+7/ eld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this co dl(t-k y */ymxpzjf2yf:f/+. hk ofn7il as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a rrxvbr94cw3 bt s6vc;8egion where the magnetic field points straight down. The magnetic field disappears suddenly. cbwrcx;6 34sv vtrb 89 When viewed from above, what is the direction of the induced current 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 horizontbdi*) flnq-e4 al table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wiren d i*f)ql-4eb. 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 k.t/vvgp1-sp of wire with the north pole entering first. As the north pole enters the wire,svptk./-gv1 p 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 ccldm53 b 2)e27umse cdonstant angular speed about an axis whose direction can be varied. lmdmcc 5u2 )e3 eb72ds In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axq6 371g2b/ vxjgin+afz eez(i is whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the indueqi b giz z 2(3/j6n+1eavfx7gced $emf$ 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.w;d3n c9 slwhhz/8hs 8
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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 an pcy+a3 +qzq*q $emf$ 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 magnet8mfqu dnxu24s ,qgv;9 ic 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 direcs7ixol-k(y j e k9o4i)tion) is moved northward at constant velocity through a magnetic field that points seiki(ko-j)49 oxys l 7traight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular 3qy cjiu (wvyix/3c-4velocity $\omega$ 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 a*9mid,ea)sp*k(6dy-gvt ut 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 tx w*z*/cdnb:8 lz sq2ahrough 60 revolutions each second. The frequency of the/ 8lanbd*w2s:q cz*z x $emf$ 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 deaaxernkk 5)y0 tvy6; 25f.bo nvice 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 d 6r( jviifzk1eb( 1uu,evice 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 t kuq7a u+sk5jq z45;fphe primary coil then itzap4u+ s 7qfquk;55 jk 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 co wr kp-bz; s/n7idkng: v1k+k,il contains more loops than the secondary coil1, g7k/rkn; :dnv- +pwikzskb 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, thehelgrl g.b. y+ o*+cio;is3crw n-v*- power 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 resonan/ bwlyf3/)4hhnnm u y;t 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 connected in series to an ideal 6ma( 3 qabn1iqr8p,xf/3nnndf:3a hybattery of constant terminal voltaf m8n(yda3hn i13ara nqfxbpn 6 /3:q,ge. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected itl5ios;yx-hch 9 w1i3;hmb-oboh47 jn series to an ideal battery of constant terminal bhm lyj5hwbo-t;-x7h3s9 ch1; oio4i voltage. 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 resw7 n2u)4us olhistance 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 connected0 8pwsv; nv;dlo:xa h lj7;)ac to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Tr z*2fvp.()*ef lrm6zk po1w wig:a;nhe time constant for the circuit represents the time required for the current . wgvkf1lfpop;w* :raz6in2)z *me(r to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batt0n) x1 s4r+o ludwb2 (tpqn xho+l0*isery is suddenly removed from the circuit.p)lton(41ob0sd2 w u ++ q0hnsr *lxxi The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except lejw, kop7x;n/g g/)t:

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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 power2p oiose5bxjj59+)rj r11 lb w 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 connexsu68r-ia y:c cted to an AC power supply. In this circuit, the currencsrayi6x : u-8t

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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 byw1dav 40nur:v what factor when the frequen1 w: ndv40uravcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor in*e mb .9w6dk jhxieuro8*g0y5.2 pgjs doubled, the inductive reactance of that inpyg mjejnu.* o86dw0i rx9* hkb.2eg5ductor

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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 approacherbrnns.m5fa6 tie-vx)( 49 bps zero, the inductive reactance on- 5pv bmn)xre t4(a9si 6.fbrf that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this s) xk4 , )ww;. m)yk8twfzamrhcircuit, the current4mmtzy sk a)xw.w8rfk)h), ; w

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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 fa cwl* v0y9yvu;ctor when the frequency is tr0 wulv9c*v yy;ipled?

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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 voltn * 9y-0fhfsirms.ny,age across a capacitor approaches zero, the capacitive reactans.s0f-m9ynhf,yi n *rce 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 ow q).6q7dgqf rv7u-zz**nmeof the inductor and capacitor in a RLC s7vu-f*z.*zog7)6wr qn eq md qeries 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 aw-k740b-gr1 uzors;gq8 dxt wn RLC 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 *,+m0iddbr y y-7qqgy of the circuit increases if R increases. When is this state r0+mg*-dyq yq,7ydib ment 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 circuxq50oh(,c gp ait increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incx1y 6ru p:p0 on/8 s 1g3 ojvdfbz)t7ev)egi)greases 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 bos2qtqf0poo9a x : qi2-th double in an LRC series circuit, the resonant frequency of that circuit wi -20fioq tsqao x29:pqll

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonance,ci u4uq o5v+4 * hwvh8dr:/-8iyu rsnb

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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 RL6w k9-.8qz tqks zilamd48z*mas n9+ xC circuit 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 rvn2uc*ss*;mm9bgu:ga o ;0 ohotating in a uniform magnetic field of 0.20 T. Find the magnetic flux througm vamh2;: ;9gb* gu*sus0no och 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 radius 0.10 m is rotating t;)ifpjr k30v* fo/odin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lork) o fi/3*0 vfo;tdjpop 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 un, l:-/wgazwa .af p:4spe f;is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the uapl: zaf4wpgn,/:- fwe; as.loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduce totp:x;usq. (:hkce0s) 3lgdd 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 change,.v/ nxalpa) m+ 0idtyrcf:mjw;;f 2qs 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)-hknue 5q +tx 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 average value of the indq+-k h tn5)uexuced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns 8uc9/ol3aiz d:mmb+fand 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 tpb8u*vo ta8: 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 location where thekxhvy5*9 acxf e:z 8kf20km9a downward component of the Earth's magnetic fie*98ca0he5m9:vzkk ffxy xka2 ld 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 i;)p6g y-c yb r)xjwi/ u07 pbs0hwlk.us 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnekr6y.hsp)0 )gp i/w-0y;ucj b b7w xlutic 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 x1qowhnh 1i a27s; mp/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 of aug26p 5i*pdmgrea $0.090 \; m^{2}$ 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 kp(q-99 8xwgo: l dbrnon 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 ofo9qgw-lpd8 k( bnx:9r 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 og0 dc)sys5 q9i;kj: pwire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output3b6; 4z sc3)gq.ofs*qlpr v fpo-f5ed of 12 V mpffvr*d 6fses.go 3cqzop;l45 )3-qbaximum when 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 gbecx lw* g05yma8ohodj h 7895enerator 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 motorugrd2 g4xup*x+yi tr6g140hbv m d.q1 have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Tb94-kq r+kwlg(a zh 612i t*iaqemo-ghe motor operates on 120 V AC, and when running at full speed 4(2-qg1 l6rtez gqaam9*khbkiow- +iit 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 supply ft ;gp 2ztvnr/w(xg7p- h3bi(. The operating current is 1.0 A. What is the start-up currentip 3ftw t-7;( pg/ v(hbnr2gxz?

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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 2pvvw** v) noc-, zuf m:nwjh154-V power supply. The operating cuf ,o-vvp jnw*vm*w 5 :1n)hzcurrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal ;neub. w+ /b psl.fn.mgnr)3c8w l6rwne m*7sresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacwl/f;r) 8br.w+wgcnn m .7.*snpe e3lsnm6b uk $emf$ 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 primary voltagrda :-; cgbebj jh zh-3ql(c6+e 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 se+m/odom 06xi5bvr/hqcondary. How many turns are in the secondarvq5m6m +ix rho// b0doy?

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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 1106-gldb6v812rt n j;-v koorsj-V primary if the 24-V secondary has 100 turns?6vjbr kd;-o -v6rjgo28nl s1t

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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 prim ce*1nfu g +)x5owyajc)o9 ci1ary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the c51 a )gc*cj9 +x 1uwe)onifycourrent 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:b4n o07rwn)ckbpxz3 transformer. Assuming 100% efficiency, how many amps apnnwbk4:o7xzcr b 03)t 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 uuqp7 5awm--y10.0 mA. The primary coil operates on 120 V. What does the primary drawqu a-m-pyu 5w7?

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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 gzsn,p;1.q+od ocf 8s o dyv0,its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what go;fd8, ,.d 1n zo0sspqvoy+cvoltage 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 6stag0/y os,* w/we) 4wyy/+kdjjx(t e 0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in t y*e4 ,yeg)wo0 dk/t xtss/ya ww+j/(jhe 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 he) :kz ;)mleshas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpm: zh)e);kles ut 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 ha8a6wfxw-*p-fxgzvy.72ch 2i n wnh r6s 200 turns. If the input voltage to the primary is 100 8 r2 ag wvfn7yx6w.2x -whcznfp*h-6i 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 turn3u bbjh-79t a2nu /izfxgfu6ta(j50gs and its secondary has 200 turns. If the power 73uh ub0tzf9j f(bi-nu x5gga/t26jainput 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 A of current a es*4if,1g qbwt 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 seco g,w sq*1ebfi4ndary 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 o2fwd .3xe gg5ot -vl2vf current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total r l2gg-wet x5fd3v2. voesistance 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 voltagip r0f .i /:sdbfj8qy8e is usually 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 line if the vdi:08 8sb p/fry .jfiqoltage 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(parmdsz eg.); i 16shi/0yio line 50 km long 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 tr rdge/ i)z;isim.aoh0y p(61sansmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance c.wo;z hv nx85of 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. nx8chovz;5 w. 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 wouk;zqb*2-siftef,;p- jsiiqxu(; *m q ld be lost if the power were transmitted at 3000 V instead of f;qb-q esq ; (-z stxu,* jkp*miii2;fat 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 a -8nwkk :+ 6r0xiwutez3nga.qt 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 theirx t8w kgaq.3n6:k0-nw +zeu 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 stor:cqp k (t1x,/c qt2wdjed in the coil's magnetic fie1(qjctctd2px/ k, qw :ld?

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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-m0, 1se tdvo;wW resistor and an 18-H inductor. What is this circ1s0d o,wetvm; uit'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 t irnnmkf*.v/x3g+y/.yg ;ac7o n y+pkhe 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 hls 25zhcq+6hd:o oj0peak 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 resistance 4k3i:pf5l rsxr9 bzk1of the lamp9: l4rf zks1kbix3r 5p?

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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 powerva,k )9 dx.yzd8b6dni49vu td supply. What is the peak current through the resisadn vdb d86z)vtxk y94,ud9i .tor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the por6niatx1if) 2y (fw hvp*4ct2wer dissipated in the resistor?pf*t4i26tx2f a)yv 1wrn(ic h

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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-a4z6e ;n 0wy4snhq0kx W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor s/djaz0ubzry f9v8zm /gh-z ji/0*)m 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-W3 nahwv-c--kvttoo04e v1ay1n) a* 5kmk bo*l resistor 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 7 vag*gi11 dbk c8hx0ra 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 rea 2mqtyyo/.towf c3aryrqg u 9-15(cvbo0a*6 actance 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 in/tv; o /dsc1kc :r3q1zhu mlb7ductive 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 dh(n2jw.d) wpreactance 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 at a frequency of 20 kHzb7j+cxgt,(6lkste3 f is appli7s 6t(3ljfe+btk cx, ged 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 thr1rh -i,gr.gpxu.7dioough 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 o5pm */nj96f8q, f+ddf qjzggxf a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of; bv c( e7rghjk4n+o4x 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?f.7bnyvp3fgg ,4ab5 sevl*, x

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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 capac;:5c lspgq 3niitor be 100 W:53l; i pscngq?

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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 bnar d1.aa i1gq k)33b* ysud9a 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 crccu1x9lz 9a+ u0fh+ nircuit with 12.0 W resistance, 15.0 W inducc0a l+ 99 +u1fznhruxctive 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 1500 Hz ifqlfdi im i,mk2kzo 5+ax03*;f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conkf;oi3*zfa2 kx mi+lm0di 5q,nected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, andps3+hg,fi1(i wol+ftt ),sj )w 6k(xt6ekb ye 1.0-mF cak13)oe+j (ilhs( psk e,+iyfgf6 6twtwxtb ,)pacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in sd3 )r8rhczadw zo 68+ nxcnijw3+: kk,eries with a 20-mH inductor, what is the impedance at+)i88,xjwnh 3dok znkr: wa3 c6+cz dr 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 i gw11)dtfrt( lnductor, what is the phase angle at 101r1dtlf wgt)(00 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.jvt2cz *ena1.0-mF capacitor for a total impedanc ta*ncevz.2 1je 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 ic 131hzlx uys1n series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at c1yuxzh3 1l1s 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 with9 j0rlft4 rjf wn:w)9v a 450-mH inductor at 5000 Hz for a total impedanc:j94)vw fr ln0fr9tw je 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-MHz7der hfo v:6b* for a total imdr o*efbhv 7:6pedance 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 h8jtlb;2k0f y the impedance at8lyf; hjt0 kb2 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 103atc1 0nkrw 04zr*ksy-mF capacitor at 1.0 kHz for a total impedance or k ar y*t4wszn31ck00f 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF c793q(x8xfeeo)n gihujk(5 ujapacitor at 1.0 kHz for a phaskgni(ej7 xxu()eq 9 u3o5f8h je 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 serif0 dyyk4wvp ,pz;*r3 ves with a 30-W resistor at 1.0 kHz for a total imp 04zw; d ,vpkv*pyy3rfedance 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 series with a 100-mF capacitor at 3,gyb5b ;0 cg6.ru ds.fbemko 120 Hz. What is the phase anglb 3bosfr, 6y0kum eggd..c5; be?

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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 e)hnu1m4jqi vm9s,j8wm c8j /1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedij nuc1 , wjeshmm4 /vj8)89mq 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 resistor, a 10.0t ehv p)6aa74 ys8uye9-mF capacitor, and a 0.350-H inductor. The circuit is connected6 48h 9spaeatvey7u)y to 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 capacitor of capacitive reactance 30 W, and an inductuf w0u -8;0 pxph: :bqlgnpc4kor of inductive reactance 30 W are connected i-pglhn:cxq0p: ;uf8 kpub0 4wn 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 res :ov7qlp 0ju4sistor, a 10-mF capacitor, and a 0.45-H inductor, when connected0o:pjs ql47 uv 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 an,wi:mrtxo0rq+ c74hyqgd5w 6gle od6mc h4wg5+ x7wyr,tqroq:0if $40^{\circ}$ 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 hawoe)601+ vzery i x 3ig8cikq)s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sou+okx0r)c 13 yi)8i evizg w6qerce?

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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 a*5 +l/ k;woszsf;g dhxc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?osg/d5l xzw;*s k+ hf;

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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 ci50fk1+ nbfl kab5t+kv.imk2 eugs 9v2rcuit 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 resiszl23i56gg/p6 esp sa ctance of 30 W. What is the25 a6g ppsegi cl/s36z 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 a series RLC cirgdfc zgese1n7 / tu7xuy5 (8:acuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,7 zsn(xye1ca: g tug/7 uf85ed 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 anwao1kf5v 4 .oad a 15-mH coil in series? 4fo1aw ovak5.

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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 seriyb4 k8hczlb9h 2 4jrm9es with a 4.7-mF capacitor for a resonant frequency of84l4 hb29cr9 bhymzk j 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 se(,,4hlnak te m je-3apries with a 3.7-mH inductor for a resonant frequency of 1000 k 4ah le ,3tjemn-(,paHz?

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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 serq4vd-3 ugdp 6a5imco/ies with a 30-W resistor and a 40-mH coil if t/au vo53d 6cpdmqg4 i-he resonant frequency of the circuit is to be 1000 Hz?

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