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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of ma fr4 ),rh:t5jeg/1umr5sfk z cgnetic 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 that tsi7 lgv:o./n zhe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kin8 klliw-7zddgsgx9o .sp fl n.1)f. ;id of change on the indu ) 9l-l;.gdi.f fs7x8noigw pk.d1zsl ced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produc ausggdnmanmu79z.)5l *b,3 pes what kind of change on theuab 5d9.pa7nug3*) m,gslmn z 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 vv e*1yv0-hxtyy/5xz em, c*i2qoo :r produces what kind of change on the induced*i510/oye:h2e *t-ovvvq yzx cmx r,y $emf$, 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 fro gywnt1w6r+dpj2 1;qf wx a:(nm a magnetic 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 conductor wil2eiy04 a6xelr l be that which tyrxe4l6e a 0i2ends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i(v- cdpcc:dh- ts center with its north pole pointing down. The stationary magnet induces (wc-c (pd:v hcd-hen 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 magnef g 3ep2omat:5t is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces f53:e pmgtoa2 (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 mafh m,e /22:bugpz)bw kgnetic field vector points straig2u ) p/wb:mk2gzfhbe,ht 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 magnet c)ps)ckq8f7 d*da m(hic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced currempdfac s)(qc7) k8 d*hnt 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 region where the m;nm: oha213nq;*ivtw/ nq k tmagnetic field points stra2a 3n kwqq1nttv/n;;o:mmhi*ight down. The magnetic field disappears 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 h1+f 8 e.zmysedorizontal table and carries an ever-increasing current northward. Two coils mede 8. sfzy1+of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole e.7 ty-qkjns*j ntering first. As the north pole enters the wire, the induced current will be (as vj *n.ysjk q7t-iewed 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 cofv :qp 9()ou3idpykh2nstant 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 rotation if the inq:i2 o) hk3fupd9(vyp duced $emf$ 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 angulh*i6yq; e io4aar speed about an axis whose direci46e ao y;*iqhtion 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 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. +fa 5 j8wrj e*h+bkwlk8f15vz
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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 +ae6eht 6co(mthat an $emf$ 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 fievm, p94myut9xa8g ro/.whl *sld. 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 the5wca nf/t(5yh3syf0 -1st7(hbottx q east-west direction) is moved northward at constant veloc hyq(xwft/f7 h(5t bys o3snt0-a5tc 1ity through a magnetic 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 rotates at a constant angularcw r(w:a:jjpf s 4cea/w hf,b+u*m 5p7 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 trans) /9 p/oflvbezforms

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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 frequency of tk1u:mds) p m9 3: uwpxz5wwzu(he 3 1z: wuwpd95 m:)u(xwuzspmk $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tlj(p ;d*tmpuaky/xo c 6 /9d-eo

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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 d4xur:y*() ktiar o,ke ps0y y-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 the primary coie ;+j/6:ia*gagu oma il then it i+6m e*:ogaau ji;ag/ 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 thc.des nj nv+75e primary coil contains more loops than the secondary coil then i5nc7d+ snj ve.t 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 pow5n0 4wzzl m0fub+ mmr738qtater 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 circuit,l -m b.67onc ,- y8htm8rilfna

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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 g+l/gan gdm0;battery of constant terminal0g mgg; dna/+l voltage. 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 inductyfpl 6 oz:fdwhu*3rq uwu,n))s- 0 )hnor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, th0wfwu nso,u *)d:6q fuhrlyz )3ph)n-e 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 resistance R i c4yz*m nda(nv0* +hy4j4fc+w u(lerks 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 withm3oop84 v(xk z inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 batt-d5xd .hfwf:lly q .i0ery. The time constant for the circuit represents th0-: lxhly.5qf ddfiw.e time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a b/ , h.usrv0djh yh16kwattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time re0huk1,j yvs/ 6dwr.hhquired 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 sabs4uyv21mrv d6 wd:h8me units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On ) p pooer0lq3-2zs g8zthis 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 connec ;:ayofpt)d.g ted to an AC power supply. In this circuit, the currenyp)a: ;g.f otdt

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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 changest)c*k(- r lgcie3mv-rs3p/c k by what factor when the frequency is 3e- kr*-i(kgpv /m)cs cltr3c 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 z un177o4upc isqx4r -d q 5pg79gb8chAC voltage across an inductor is doubled, the inductive react ps i4cu 7xuo gn58zbgq-q4r9cd71ph7ance 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 voltage across an inductor approaches zerus04k rk51no mgq;5alztg - iwuj;1 p5o, the inductive 1 u 1 -gr ;a5 lp4zojmg50kitqwus5nk;reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cir+q-1t0(ch)jy n vmcvl cuit, the current q+ty nl1ccv0( vj-mh)

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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 ch ;5xmc;2z idhbanges by what factor when the frequency is triple2;5bd mh; xcizd?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appr1ndq6qy; * r-s6zm vsp5 9bkfvoaches zero, the capacitive reactance of thayb*9r6 -1sd 5vsfmnqv 6;q kzpt capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a aqrjccdf /0hk4) r l4uyl9w8 3RLlqk0ud f jw394clhc) 8rry/a 4C 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 z47alogy 8 -wjis defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of tcdtyu,98, yw )q hwh:ihe circuit increases if R increases.,dt h8w)c:hi w u,yq9y When is this 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 if yovcne .7j)k 4$X_L$ 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 isu4kggwk y,yj hm;n(3jof a41 + cx3a2ncreases 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 Lcufl99(tqx8 8u cnp1zRC series circuit, the resonant frequency ofp fz( x8qc98ntu u1cl9 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 driven by an AC app3dfdlvq7awh + d)z**alied 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 R; 6kqk/9.tgikfwut,nk,+n pr LC 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 rotating in a uniform magnetic field opig+u)to e xen.cpr021pl 4.uf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti.oi2uc+n0u)p1 e et rg.4xpplc field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic f0i.f lc6ywj(o v.227zx srvhs ield of 0.20 T. Find the magnetic flux th(.7h.x0 cfsv o2wz2 rjlv is6yrough 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 radiurfe4 7uoa v0r f.+ql4cs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an o4vu aflr7 c qr40ef.+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 adjr i ge 1.npsr2n6dcb;l 3:j2j:g5 dka(jbkm+custable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro +blb1. 3m -r38 )seoyrrpa.pr4w lpbmm $4.0 \times 10^{-5} \; Wb$ 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 wiraej l w4o 2y9igy9a7x;3ib pv1e 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, j1e499 l7;3vig iw 2yopbaayxfind 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 wnc6u;a9bvewy ;.oj;(x ;et(v obz)ofith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar9i y smbc(1p( a9mt 3hsof5h d29al7dhea $0.20 \; m^{2}$ 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 wss ypv:zn7 ::flies horizontally at a location where the downward component of the Earth's magnetic znpvs ::s7 y:wfield 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 lon +u fjtcm2q9j/g rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through ou9 q+j2m tfc/jne of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generatorf 2g :cvx37b)elcrids/b5 4h ;/lszuy has 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 turns g6y70v v3:j l vxrfz o;tqs:t-of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its 5h gm*nim3kd( 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 th35kmn*d i gm(he axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wkaz- g56i.mzcire 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 Aqu8jsf x( 9tar2cc i/)C generator with an output of 12 V maximum when rotated a)r8aj 9if/ct( qscx2ut 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 genera2e 6q)w(ndfj;b *bidrtor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistancw24vd(6 x0sd fn+9 4zmdwgow fe 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. The motcx5 w 8gb)n)yj7rs,6;en3w pe k:hzcd4 ykth,or operates on 120 V AC, and when running at full speed it generwz7yn;kpkxse:h e, w)bynh8 c4,3)c5tj gr d 6ates 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 con / t5oyjq8evf.nected to a 24-V power supply. The operating current is 1.0 A. What is the start-uy/ov jq 8.e5ftp 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 power supply. 2 v4l;6nzboo, hyfli3 The operating current is 1.0 Azo vn3ho26llf4;y ib , 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 24r* gjj47/cvi (h3o6(gxszpw w-V power supply. The operating current is 1.0 A at full swjpx(s iz4rgv7 3(/how*6c gjpeed. 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 needenz9zmph i17 fn;;vv n8d to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 xe hp;(q/ybl00gez; wA to flow in the secondary. How many w(/eqx ze;hgy0;plb0 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 turns are necessary in a 110-V primary i:ej6 p xwq)beyon. 7s7f the 24-V secondary has 100 tu7x7s:w 6qo)y. pe nejbrns?

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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 pr(+qhehz) i 8elimary coil and a 2000-turn secondary coil. If the current in the secondaryh zq8he)ei l(+ is 3.0 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. Assuming 100% effcmg 9;esus5oqsy6:)u iciency, ho se;mo:s95ucyqusg 6) w many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a nejp qukna /;-q.ejqf)3on sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doeeuq ) fp3;/qnq jja-.ks 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 tur7s,a iuufu4/o ns 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 uu, 7uf si/4aoin the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andbvq*h wt14w8b 300 turns on its secondary coil. If 120 V at 2.0 A is applit wb418bvqh w*ed 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 tran:i b4 2zjjkcqq;jby+ 2(fzks542wr xpsformer 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 seconjjwbi (xbj44kpkzs;52:+ 2qzqfr y2cdary 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 hask9 7hxw)voe-qa-2 cb)sq cn (z 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can exp 9kqq o2w(7 cb)-n-vhexszc)aect 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 has 200 turns. If -amorfnej a6yo )-4,x63a zfkthe power input to the primary ire,- k-x)n oa6afm4o ajzfy6 3s 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 at 120 V. The volthx yi)s,j8 dq. b-k4pdage is usually stepped up to 4500 V by a transformer and tr).js iypdk4 h-qxb d,8ansmitted 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 tu,z w/gd+34ucdta7n of current at 120 V. The voltage is usually stepped up to 4500 udcgt3 /aw7t,zu d+4n 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.

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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 atht:5dl 0mnirlv ex/ rwj) :*.a0l(wyg 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 power lost in the transmission line if the voltage is vly(*lliena xr/:0)5 :dmw.hjrw t g0not 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 resistance of 0.60 W ,z,l.:enzw,/ lpszac . A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy wouldezln z., sacz/w :,l,p 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 loprtch3lxvwt :2 c7o++ng 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+2rchtp+v : ltc7x 3ow 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 be lkai +y tw6*2bmost if the power were transmitted at 3000 2abt6*yki+ mwV instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a lw)vhq;4rjd+,3 3f bgw 0eji bwl 7d6kiine with resistance of 0.60 W. To what voltage must the generator output be stepped kdhi3jbw re) ; 307if 4q+6wjbvg,ldwup with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is s 0agbu)cqv/h (i0p1f wtored in the coil's magnetic f (iu0gw)1hvp cb0 q/afield?

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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 anyt w0 p2o 9lln:e4jctff7tq9mv:c )51v0dh dud an 18-H inductor. What is this circuit v2tu)o95dnc mp7 w:fl9y:djttc0 hfeq40v1l'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 w*2c n vwkmm/9m5a5gx dhere the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-3u mn k xer35pxt)z4f3V 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 t(li o-:9b 4x2 ;ihvavw lphsb,he resistance of the la:abi2lixp,v l hs(hw b4o-9;v mp?

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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 12j1eci+ o)-h qor-uq(pu3a6kh 0-V ac power supply. What is the peak current through th)o h-o 31q-caqpj 6ieuk(u+r he 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. Whatucl ; q,2,ssfw is the power dissipa;u2ssq f,cw, lted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ref qw7s93t +am(yw 1jwssistor 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 r6b-i g*y 3rr4hhd8uyuesistor 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 c*rw b/1g/ml6idg x hd(. /+fvsvu(ca 50-W 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 a 1.0-mo8 m ox87czo76c)c)kj w-uci dH 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 inductiv*yhrq 52rui3yrp6c * we reactance 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 svx+k: i/e:nj14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of:ti3hd hhij7) (i :woi 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 o6oj-tdmh,/,mk6) qfeo.v bd is boh)o dmk me-o6 jq.t6dvf/,,applied 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 through a 2.50-mH coil due to a 110-V, 60.0 Hz source? p8 i+qh:q)v0rnnn/wk

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz?l,1gg9 -ll gd0(dpkxmtxn ez9f,6h zc 6h6n s9

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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 lb:k9s ez/vk0 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 fr8 ri2iqsn5 4W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wi0v,ekwecf8cmvfq 5l l94 .hn*ll the capacitive reactance of a 0.010-mF capacitor be 100 W? *8ckem5 ,0vwvfqn l 4el9chf.

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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 at 1000 Hz a 3)shs(af bg6-kxfq n/nd 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 ind snrm5hy-p3+ tuctive reactance, and 10.0 W capacitive rh5ty-p3m r+ sneactance?

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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 resistorck 4mb1rpyy ,i/5tv s+, 20-mH coil, and 1.0-mF capacbri5t+,1y4/ ym vpsck itor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF1s/h mxs n+h;c i(vm-i capa /h ;mcsh+-xvnm is(1icitor 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 )zy lsyh +wj+v p-(1zv7p.hfg/tm dh7, what is the impedance a h)7h-s/vlw dy+ (7hzpp1m gtzfj.y+vt 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- q/v4t6zdhms*mH inductor, what is the ps/z qdh4vt 6*mhase angle 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-m ) uj-vfa1n5 hf 0cy1r-rywrh tk9hf4(H coil and 1.0-mF capacitor for a total impedance of 100 W at1 4hhfv1t-f fryc hj(9r0y ruan5wk)- 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor giakk7a io+(0and 15-mH coil 0iiaoakk 7(+gto get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at tra1: arj5.fqid l yjab7t*3, 5000 Hz for a total impedance of 40000 W?3tq id .tl,rja a57 *b:yfraj1

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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 100l;0 jn* (qarod-kW resistor at 1.0-MHz for a total impqaon*0j dr;(ledance 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 serie8bk y10 mzd*8h+r qawus with a 20-mF capacitor. What is the impedance ath w 0u+ bk*8rmyaz1q8d 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 tota5m:vyois jy,f9;(mc i q(v +ral impedance of 45 W?5v9siym;jyf (: vqoi, +r(ac m

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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 n kd (vzvb-d/r2lb:78ffq .hmcapacitor at 1.0 kHz for a phase angle v 8 fnldz-k:brhfbq27(m. dv/ 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 resistor at 1.0w*c*h2r f0c pj eesq85nh;-xw kHz for a total h f25-8pxrqe c*0; n we*cjwhsimpedance 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 120 Hz. What i./5xmdlm20s f z3ek oks the phase2 .oze0 fs5dkmxm l/3k 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 an *l0k.yw+i)gagm ,scuom 672dpr zi m4d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci+a02m 7g rdl)pkom mcu,w. 46iyizgs *tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor,qq-5* f;k rp5 h 6: s*ry t1qwwqj)pat)mjqcq( a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What -w; pqtj )q*q rjyptf:rq m6*1s)qkhw(q5a 5cis 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 ytnndqu. .axers31 p726cz0g2r2 spe reactance 30 W, and an inductor of induys2. zcdg2q7esr.nan21pp3 rx 0ut6ective reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W(*ukrjs .fx t i)c 1kn-/qw1gi resistor, a 10-mF capacitor, and a 0.45-i(kr1j.stuk -*1cxg w)i/fq nH inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nece:pfw t4/ez9qhn dl 3)l*2sximssary in series with a 500-W resistor for a phase angle o 3wznxpdt)qmie24: l fs*/ 9hlf $40^{\circ}$ 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,) 4fzuefj0p0 vh-e4 z 4knggo7 L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferrn0zj fg)-o7 04ekp4v u4f zhgeed 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 resistanj :w;y2 mresiq /p9ev;ce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12 erip j2 9/;mv;y:esqw0-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 9f; ,pg(;cpjug*qe/n qnxr1srr 28mi circuit 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 im3 zd)ybaae9cjis- 9-ppedance of 60 W and a resistance of 30 W. What is the power fzajs-3)pa i ec9-9dybactor?

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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 selrxn /t)h 7)*r mtbz5cries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wh7t*ncrrm)l5) / h xtzben 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 frt0 og3p dbl*49*umo.ak v+hp gequency of a 1.0-mF capacitor and a 15-mH coil in series?kpagdt **uh94bog.3 m+pl ov0

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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 se2x-9k/ ert/x 4lr+k )r mpnrczries with a 4.7-mF capacitor for a resonant frequency rpkl xerc29/ nkx4 -r)mtr /+zof 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 3.7r5 mrlh p.8+ke-mH inductor for a resonant frequenc.rmk+rhl8ep 5y 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 resistorl2f(w 2a3fo dw9)jcel and a 40-mH coil if the resonant frequ(olwdf ecjf3a 9l22)w ency of the circuit is to be 1000 Hz?

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