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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 orvnzi .)zn .3e7vkh7a f magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states 6x 0 exoxdk/dou4;eu0fo,mq: 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 o5olg r6 ni/k.vx rk+6bwv* aj:f loops of wire in a coil produces what kind of change on thea 5/kj.x+ k o:gi6vbrw6vlnr * 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 msv ,)k)1s kcfthrough a loop of wire produces what kind of change on the v)fk1ksc m), sinduced $emf$, 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 p 9 z6zkn; js t4u1eo3 yj;(ue5qiqg8mrroduces what kind of change on the induced;;y e r4jni e1j9kms8z5quu3gt6 zoq ( $emf$, 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 magn z )xuiv2i;dx(nceb4-etic 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 ind2is4 2simqcqsz nb-i9;9wr +z uced current in a conductor will be that which tends to produce which of the following eqcn2i ms b92;4s i9rwqz i-z+sffects?

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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 owah71 )2jww8 c6tkz :tdrsfy2n a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet cf 8:swtjdak)r 7yh w21zw26t induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heljomq xfnk*r0:jd,q -vaok+ms4,8z4j d above its center with its north pole pointinrqo,,v j*4oskmjk:nz+0da8 jf4qx-m g down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a regcq bz7viso0 24ion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as40q2zv sbcio 7 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 regionxgqxap1kh9h 8 uye5 288k4s nj where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced ak2xuhy5e j 1h4 knqgps8x 988current 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 table top in a rhx.ma2v+/3nij *km ip egion where the magnetic field points straight down. The magnetic field di3iphv*m /xnkja m+.i2 sappears suddenly. 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 horizontal hbol2l20h i t6 kutt9*table 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 in2k*l62h9l tt hti0obuduced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole en/ge;ng9 wbiauadz76 6tering first. As the north po guzinda w ;976ea/b6gle enters 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 is rotated at constant l*zn*xo4b4wq angular speed about 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 loop's axis of rota*q *lx4wo 4bnztion 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 )s)bs fbqo 7qzj;.ku3angular speed about 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 loop's axbozfj.)qk) b7;u q3ss is 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.jt0 v6h3 pqas9kkr+t r n6yj5-
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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 aja nis6+k-)s2gb ra-un $emf$ 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 f5fryz .x/ z/)qp1k rvhield. 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 direcwfz hi c1(4x,g44y yfbtion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced (4yy4x,wcfihfg4z1 b 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 bora8x++ gk;nn6 je3wx ar rotates 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 generator t( l1 xwg xta.ma3302y)bgch ksransforms

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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 ea 2b7wem h/)m2u ky/vl8pcve2jch second. The frequency of the mj //u cy 2vv)mlp8ew27ehb2k$emf$ 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 db m9f phw k6yh1b)r (6imth;9wevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thatcp wp 7 yr*:*gyqdjie5. e63ib

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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 loozl8bx;9 : w)lb24ax -dex ,6u yrjnqbbps than the primary coil the8x4xbb re9 ba)ux- ;qybdll,w 6n2:zj n 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 m-5ejx : k2 dh.jpokbvl24zv +vore loops than the secondary coil v lkz-4k+2j:p2vov exb j.h d5then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp(d muuith1a,k /(ead )ut

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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 resonavr,ox8m*/iveuh49 yinr1 yq3- 6vg d cnt 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 are4l3p1pwzgxn * connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage x4 3*wlz1pgp nacross 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 n60x zb9 :tlnjhdr8*aideal battery of constant terminal voltage. At the moment contact is made with the batterydn8 tlb0h*zrnxj6 9a :, 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 cpqtb :/d,;bx i4u;tpresistance 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 connect:s 8etdrc ,ur.ed 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 se)- )illn39lhy1ucwuiries to a battery. The time constant for the circuit represents the time required for the cucy3llu ihni )-19) ulwrrent 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 battery is pkomcu .3nc 2g-+sd-g suddenly removed from the circuit. The time constant for of ks-+c pcgonm-d.3u2 gthe 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 havefdlv 4qn 6z6e+ q4bn5j 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 connectedakxxqvqjs,- qqh )zjltk3) gh:54 i8 . 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 connected to an AC power supply. In this cirrf l 30)vz+hndcuit, the current)rz v lfn3h0d+

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc 8xgx4b1;ckt le in an ac circuit changes by what factor when the frequency isgt1b;xxlck 48 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 9ig8 qqotof4c7q,,) r ql(e uvAC voltage across an inductor is doubled, the inductive ql ,qutor f8ge), 4iqvoq (c79reactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltag9n w/n-c g()pqax9gxy* (nzco e across an inductor approaches zero, the inductive reactance of gp qyzxx*c)c -(a 9nnn/og9 w(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 asb :lycw ,a:dj 7h:p lw-8a2ymn AC power supply. In this circuit, the currentbcy l87aa2d: -:,:jmwphlyws

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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 cirnwm;g 0on0ku:cuit changes by what factor when the frequency isokn 0mgw0:un; tripled?

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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 capb)m29c y7k zbwacitor approaches zero, the capacitive reactance of that c)7c 9mbkzb 2ywapacitor

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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 qo5i ldsw4 hq /p6*4yjvoltages of the inductor and capacitor in a RLC ser/4*4 l6qj opshw5dqyiies 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 defined vnl8(,5tyrci 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 inc9o++i(c xaq tt:c y/pxreases if R increases. When is this stateme /cq+y aco+ttx(9: ipxnt 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 impedpdnb; 1t78gwg;b -pj bance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Te7 if(1d4 oomzh+)mdvzmg/j6he impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circ5z5e4mb b c:xp dh/ssggugyo8msm 52 q7* (b6puit, the resonant frequency of t52s/hd g gmy*bxzbosp755bc(s:q6m 4 em 8gup hat 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 b3)j : *xesr yphice(m:y 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 okj/.h/.7 uc5 wbfd+) cgzsjfwccurs 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 ro9,ltx 2p-g-zlnlc oy0xnh;x9z+xix 5 tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the zl oynx ;0 -5h+ gzin99tx,-llx2cxpxmagnetic 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 rota-::w6ff x9qnh;y shjm ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop nhf h:9 qfw:yms-;jx6when 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 rotating in a uniform magnetic field gb u,g vrju- hh86ib:.of 0.20 T. Find the magnetic 6u8b-:,r.vgghi uhjbflux through the 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 loujp/g /v um;) xul0g(gop 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 coi ypn 0sdu7 4;jaq)ws(xl changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame withkl 5j gtgm u6.xnsq2xc*350un sides 18 cm. A uniform magnetic field is applied perpendicular to the p6mxg xcjnl.gtsn055 q3u2 u*klane of the coil. If the field changes 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 turns and an area4,xbi6,ogz z h 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 ar.tlz* )h*;ki rzqaqf:*1fi b kea $0.20 \; m^{2}$ 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 lemxv69 zflh mn 6uen 8ht119*bocation where the downward component of the Earth's magnetic field h 96v nhmme*ubf19l6x 8z ent1is $6.0 \times 10^{-5} \; T$. 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 angu:a1uq kf.u1.dei h5vp lar velocity of 2.0 rad/s about a vertical axis through one of its ends while in a c:e.uf1k.5uph i q vd1aonstant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator yn-s u/ a+,, 0jacpngghas 50 loops 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 tbr,14v pdap6 h+x3we durns 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 wnjrmkv5mw / a3 s,)k-b(x+b g)yot- iloops 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 rotata3v5gskb bi)wmr j wx-y/m+t, ()o-n kion, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of:vpxt*-r mx*f b18 hxs 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 construts/ zcntl2r ;6wwxi8-p*i(x 9 ev 5bkrct 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 cot 62; /spxwiebw( r9r8kcxi z-tvn* l5il 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 maximu:5 tc dzf sig14fl/9pxm $emf$ 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 resistancevc-j9qp f/1 6qm6 jtd j,yurl:6unp4o 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 resisfbb5g x9cpye aohq9y15 3f l7-tance of 6.00 W. The motor operates on 1gqf19 9x7y3f acyo5pbe hbl5-20 V AC, and 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 resisc;0e)t0vuu*hdyrt,ukv+7d n tance 6.0 W is connected to a 24-V power supply. The operatidc* +k ev7uv ttd;u,n0h )yu0rng current is 1.0 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 nvbc k: 2g5;rmpower supply. Th5crvmg nb:k; 2e operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24- aj/2nq d2.fvkV power supply. The opern j2qfda. /k2vating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage of(27+o, 4z)jg5tsnokqz- t k2 tsq ydmk $120 \; V$ 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 trxoydh+sxjqh3. zzk *o) r 0t1k01nq3ttro6c6ansformer causes 14 A to flow in the secondary. How many tu31t* 6sk 0o zo .jz r c1hx0orknhtqtdxy6)3+qrns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns ar7r)(ms(k qla5 n htn x7or8ao(e necessary in a 110-V primary if the 24-V secondarynrh)nl 8r7ta( omqk75 os( ax( has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-td 1 93se7vb+nv07fr-q dwy t+xvye :hkurn secondary coil. If the current in the secondary is 3.0 A-k9ee +svd 1:+3rd7q 7nxht0w fvbyvy, 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 trda-rrh(v8 gf +ansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondf8( r- v+garhdary?

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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 10.0rwh40xf7b. efw m0 i6i,ou4-mk b 9wgu mA. The primary coil operates on g-bru6f0 i4u97we wfm.wm0 i, hxbko4120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has ev* (x) 39fdixa*vj vg60 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 secondary?v3egv)*a9 f *i(x vjxd

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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 secouj k1x.l(o5 fwndary coil. If 120 V at 2 j.owuxf(1 kl5.0 A is applied to the primary, 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 transformer40u((ql(fwrn:nq j,a b1hr m d has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secmaw(nr (rfj4 dh1(u: ,lb0nq qondary 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 seco2z2sl7p hc6j7evf aq -ndary has 200 turns. If the input voltage tvlec p q7af2z7-sj h26o the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary haice hxl h()::lr7v i-abgi4+a s 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fr r i4:igbv+:ahec -x7lhl ia()ictional 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 f5eb tng468w6t5p c vsof current at 120 V. The voltage is usually stepped up to 4500 Vtg csve6tf5p5b684 w n by a transformer and transmitted through a power line of total resistance 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 at yeb4+dtf3aji,lj0 : *tu ijg) 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 percentage j,l bg iduaye*fti+ :4jtj 3)0power 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 usually styc(+hev3i.ew7ej/ t7eub c u* epped up to 4500 V by a tranhce 3(*bie/v7wy j.uceue 7t+sformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistaiwo v7 ,wdw a 6oatyo3.)xfm)-nce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating ofmf,7oyw ao3d)wtxva 6o.)iw- the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gen0/lt yw/mfh h/erator 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 is lost /fh/tw ml 0y/hwhen 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 alj*j)ud3ox, jo *d+ix7zi7fr t 1000 V. How much less power would be lost if the power were transmitted at 3000 V i*dr 7,odixj7+z)*jlui 3jxo fnstead 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 xgv,7de 1ar;ube 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. e1r,u 7gdxva;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 carriev g-;.pufmu 5ks a current of 5.0 A. How much energy is stored in the coil'sm-v5.u; kfpg u magnetic 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 indu2;aeaubvw52)mpb vi: ctor. What is this cir5ub; ma )w:pab22ev ivcuit'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 cir,n4* keoe a2u5o9 q69ilww2k: 6zxbfa 6uzp cxcuit 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 int5i b 5ysgz9nz.rs; h-do 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. Wh*:r neq hky,i*ovw5fdq,r;t*at is the resistance of the lamq r*hdr*v;ow*5,i knyt,qef: p?

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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. Wha;5 guj36jv9on44pxcfg. yyj d t is the peak current through the9gjj4cyjfx5p4n6u dyg vo 3; . 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. Wha p6,l0r 0mly(d h5mejk0hd f+*c 6lxwbt is the power dissipated inhyx jllmlkr5 ,6 0ep0bd*mf wcd6h+0( the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-9 ronui ybf;c33;-j 6/qxq,exer fou )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 zj e)*(f (zohra 50-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 3g dbuxzu x* c oft+)p+35p9plresistor 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-mfp8 501-muuatad xcq; 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 reactance of a 2.50-mi;dtk -, r-wsmH 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 haj;gn ./ ;a+.w4h*aqrztv sr cwve 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 nc+;m vd n+nt.ai 1catm ckq(8(ecessary 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 at a frequency of 20 kHz is4isyk7z nbo3 ogkwby* *;e 6k. applied to kbo.34*y7by;w*zsk6en gio k it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, z; sh mxa4kac; k)f t85joe6w660.0 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 anq;x:jf:glfy1 pm7 m j1sm i*,7mmzm4 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 p;*to mr.,lav 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 1mua1hr*yj(t* s-hl o1200 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 gchq,v(0utm ;:6 td gbthe capacitive reactance of a 0.010-mF capacitor be 100 W? cgt h0uq,;b6tmg:d( v

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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 thr ,y991dpqiw csuc3 b1 antfx-3/eqb5zough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W i74,s iu, tqqkinductive reactance, and 10.0 W capaciskq 7u iq,i,4ttive 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 100-W resisto9rq pkst6w o4h9* fz/0s ,szstu19txzr, 20-mH coil, and 1.0-mF capacitor f9h9*6pqz,9 r 1zsoktzu/ssw t0xts 4are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-; .st*ddn :))t by5ygt;6phk0zwmtkfmH coil, and 1.0-mF c.ytyk fwt5 )g:zkpd*th ts6n;dm;)b0apacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor,2+6x ej gylk2t what is the impedance at 1000 Hzxgte 2l62k yj+?

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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, wha4m2wm 0yls9mi t is the phase a mi492l mms0wyngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil. jrd/+5sz ksn and 1.0-mF capacitor for a total impedance of 100 W at 150.sdn k/szrj+5 0 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-3 apnt:c,by,aW resistor and 15-mH coil to get a total impedance of 110 W at 2000a :aptbn3c,,y 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 -it7d;okr: og series with a 450-mH inductor at 5000 Hz for a total impedance of 40 ;ot-:og7kdir 000 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 1.0aohp-1i9 oio *z 2.txc-MHz for a total impedance of2izh a 9opoto-ixc1*. 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 the 0uf5bl .xt )s,i3p5c vspz*3sx / otnyimpedance at 1000 *,sl5)spob xttc p iv.30zy35f/nu sx 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(gd.fh-p wvpm, zt 3x7 1.0 kHz for a total impedance of .t,3hf m xvpdz(wp7g-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 needeiobyvl46 -xf.:iqkighp4f-z q 3w7* t d in series with a 10-mF capacitor at 1.0 kHz for a phas:vii44b3-ftq7 . p-*kizwoxgy q lh6fe 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 ne---p.3 zc1ldc gzwffcd+y8 hteded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45t1. -c8fh-ywg3z-flpzd ccd+ 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 120 Hz. Wyax*t0 g8cfa4hat is the phasy 4caa8 fgx*t0e 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 t)deqv2 p,ikhu, 9j* gHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arei) ,t,qjv9 ehpd2*kug 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 resistor, a 10.0-mF poih4im8 d+ 7jyk.gr8capacitor, and a 0.350-H inductor. The circuit is c.pok87+4h m gjd ry8iionnected 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 capacitoz(nqprb n 5-y ipg -0zri+5.odr of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are zp nqobiz- +.gn(0i55rd -pryconnected 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 contp39n xsdss: , 7he1mpmss;zy 6aining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60z: pe 7hssms s,mxs;1n3y9pd6-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 sermd;txty )qf .;ies with a 500-W resistor for a phase angle ofy .t;td;f mx)q $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what fra ygh7e**n ur/6j-odxn;fv * gequency should the circu of/j a -* n6nyxugd*erh*7v;git be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistand 2w9ixne/w27 / zenre,fzj, hg98gqi ce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn/ z qn/ei r i9x9 gjw82dg,nhe,zwf27eected 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 cio (iztvxu(2k3 rcuit 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 30 W. Whb7q 1 x1ryi.svat is the power fasi1y q x1bv7r.ctor?

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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 containing a 50-W resistor, axhlv,sb sw 43-0g*s96vdm chu 10-mF capacitor, and a 0.45-H inductor, when connected to a 60v hw -gmbu90*cs36lhvd4ss,x -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 resonantovi n) k7 ;*:doqts5qi frequency of a 1.0-mF capacitor and a 15-mH coil in series?s7*; ki)n 5q:tdv qooi

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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 il,j11vfo :: zn2nigerp( ak3tn series with a 4.7-mF capacitor for a resonant frequency o,plnf:ia zv (1 nkjoe:1gr3t2f 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 neet ,pict) nm*6t,r3sqeded in series with a 3.7-mH inductor for a resonant frequency6,npsti)qm ,3 *tte cr of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resist.x z/y5k *1jlo hwwq3xor and a 40-mH coil if the resonant frequency ofw/xx5. ko *j h1wzyl3q the circuit is to be 1000 Hz?

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