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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic v4bmp 0;g3pvsf+ ot*raho;-tflux 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 statesegot eyotds5,/1xo 9 nvra5 ,5 that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil pr zho.axn g0 wc-kajm: 5g-1+gfoduces what kind of change on thj-zogwg+mx caagn: f5 h-k.10 e induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire producesjj*)q :+nf *.boxvc sx what kind of change cojq.fs*:nj )v xb*+x 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 diametenm3:h .lv1 ,jlbs wm1z 8c.),o dsnmdnr of a loop of wire produces what kind of change on the inducejdncm:ln8wv,.1sld om ns 1 b)hz3.,md $emf$, 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-fms f3oyt)s (m 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 directv xch.x-af/9f o:;l wbion of an induced current in a conductor will be that which tends to produce which of the following effh-ox9a bw/f;x. : fcvlects?

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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 /hm*03lketgo,z :lp(8tm zgl its kmz(*geg 3 8l thl0mp,:ozt/l center with its north pole pointing down. The stationary magnet 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 ak wo/ql(mn5f2 flw p 4.1-tfrtis 5jb, horizontal table. A bar magnet is held above its centfbs2fq.tl/ - 4kn5 iw5r,o1m fjt(wp ler with its north pole pointing 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 region where q0 q*s.friz: *s z4ebgthe magnetic field vector points straight up. The magne*qsbg .sq0 e:zf4*riz tic 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 wher7ut dlu 2x:c)re the magnetic field vectotdxu2r)c:l7 u r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a reg/qcy ld--x*v hion where the magnetic field points straight down. The magnetic field disappears suddenly. Whe*dqv y-lxh-c/n 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 on48g bbck9+/ngr8xa1a6 nidbpp *id 3e a horizontal 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 induced current cn +p*r bb4pd9e di6ixaa31g /bgkn88circles

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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 thro ksl wimjd+jxv:4-3j,ugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abovm w,+-3idls xkvj 4j:je)

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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 angular speed about an axdxcxs,5-zc (v is whose direction can be varied. In a rc5 cvx,zx-s(degion 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 constts6mwop rv(:) ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be themt6prw(so v): 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.w; picj4:ulz1
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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 tu;nzl+/ cmi 2o, cmol9hat 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 magneticr6 f.a28od(m : cejxcgr ;)ses 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-8o+ag 7idpy h:2a g2emwest direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acroih2og7a8gd m2 a y:p+ess 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 bal6 efe q/qlpuu-:z42a d kb34ur 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 vhm ;,h+bgg; /q wpp8kysqqu,u )x 8u3transforms

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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 fr cfic/vy w:iwo*r af8pi-25*dequency of th:cd5w2y/iwfiv8r*i a fc p*-oe $emf$ 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 d- :r.;+woz;eohyx; ermgn 1 u-mq:wg nevice 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 thqk vd; fcx,,i:.zmsb4 at

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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 /j q f: .cid8bgw;y0vae86kivzrhz7 /the primary coili w/7zcvjhd b86rkg fv.yq; i0 8az:e/ then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more m+gl8ek;bic,qu h ) q ;z,2djhloops than the secondary coil then it8;lb,;i2uhmq + )qekdzghj, c 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 inputz1nd vmlh s/yl83/1+1tpfoxq

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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 circuix 6fxy30s(lpit,

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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 batteryogr88qj b96gl of constant terminal voltage. At the moment contg6q98r8b lj goact 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 in series to rnlqy)/ :z9eqto 8kl0 kozwea 6nk6-- an ideal battery of constant terminal voltage. At the moment eo wl-tr8 l:-)zn 96/kqna60koyek z qcontact 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 resista c86 x-efwf-tbnce 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 inducta m.y;;q9d l,)vtlczkdyjk3.qnce 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 a:8mgrv )bx8oin series to a battery. The time constant for the circuit 8mvg )xr 8:boarepresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductyk(e ;.tts;uo or are connected in series to a battery. The battery is sudd us;;(ty eokt.enly removed from the circuit. 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.bpj li(bh-1b:

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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 po3. l*uoo.vxi 3a+ i.g.vpmxrm wer 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 suppi-ixp u co;:sy)05ad qu8fl3mly. In this circuit, the curren x0mi)o;83l5aydqs u:p-icuf t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac ct,9;d,9mba gb ,ac o6mrp9zyyircuit changes by what factor when the frequency ym9c,6,y;rb ,aa9op mdzb 9 gtis 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 in( vsa5ju: * n /0pzr8:nadlw:sev kt/sductor is doubled, the inductive reactance of that izl8saer w vnd/: vnp jk0(su5*/: tas:nductor

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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 y32ko4eb5kx l an inductor approaches zero, the inductive reacloxbk4 y 53e2ktance 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 l3p( we0/d* t3wex- i ob1crtjAC power supply. In this circuit, the currenb3wi3 wp/t0c(t-ojledrxe 1 *t

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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 circuip4(rq8 an9rkmwb;t b/t changes by what factor when the frequency is t/qbr bw(;p98knr ta4mripled?

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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 approaches zero,wr-l4 an 3vm(a the capacitive reactance o- n4aam(lr3vwf 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 1:j dq-y-b,yy0hcj 3 xkcxl a.between the voltages of the inductor and capacitor in a RLC:h 0 -jjkly1- ,acy3xd bqxc.y series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined asr1ez,nalc+q atszr i/a,-,t8 $\cos M = R/Z$, 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 circuco 9ncf: 19a- q(hrapq6)benyit increases if R increases. When: c-n9pqha a) cryob9q1n6f(e 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 impedanc5w o0im7+dfl he 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. The i;. -s06u h(;9o nnm sfpgnol* 6dqqsctmpedance 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 circuit, thv4 dg8kq de6g9e resonant feddqk6 v gg489requency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an (eq+n7gnt 6oiAC 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 occurmql*aj ;2c, v kq+k,jnxe8:p ks 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 o+7 :ph b-l2pq)wou0ogt4 wc/ehbbpf -f 0.20 T. Find the magnetic +q/owo 7lectwbfphg b:p0 b-2 4)p-uh flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in v wjwkj/oh2+ wfu,,i lu, c89b ded+e3a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plwjohe +9 e8lu+wbf,jd c3u2,, ivwk /dane 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 unrqrpirq z nog;d72*i :003wwsiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lrrsiz;q0w0qno:g p*id3 72w roop 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 kuv*yu z8. 3v*qqkvg8reduced 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 chahu/ml2c7i:p27skiha6fp /5zx c-wukq;h e) f nges 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 oipu+nk6; tj 9hyo78uhpk .p1vn a square frame with sides 18 cm. A uniform magnetic field is apnp1ut; k yp7iph8 v9ko.j6uh+ plied 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 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 a:,ou: x bya1 qvav)z.dnd 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 l+qqpp lcr0ph4 p:d-e6 2 7pz8vzfnm3and 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 wherjh ve(a1m1 1wz tjw s:rkp2.l8,xniw+e the downward chx.kr1 iz ae1+jtwm,pln8 s( jww:1 v2omponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular vemrw/u ,e9ggiqv40 yh9 locity of 2.0 rad/s about a vertical axis /9y 04regh qwi mugv9,through one 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 generator has 50 loopsnzr;il0y ,rqfxi00 1 .javf3 wcky3x8 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 tdap 8)t+sot6li7c1parea $0.090 \; m^{2}$ 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 .d(*y7 wzsb pnits 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 rota *wydb np(zs.7tion, 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 flqck0ct d.y-* p l*old6v). (yrpqj3of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 *q +lbt*5)jaqrt o1zggenerator with an output of 12 V maximum when rotated at 60 Hz. A magnbo tl*)t arqq* 5zj+g1etic 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 hlq /i u:uci a:0vq;eo8 p;q/egenerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.jth8h 0m3+c;z1p d/pxyk+2nut dww :sj 1jn)h 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 moto (s xkgwete1;8r have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full sx;eesgt 8wk1 (peed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V8zd6 vepva-0jljao jy zz.dlq f951vqv3.m91 power supply. The operating current is 1.0 A. What is the start q1z vz..v5ye8a zldavm9oj-0pq 693 jfldjv1-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 res844hi;b4vf xc a. snaoistance 6.0 W is connected to a 24-V power supply. The operatingx4i4of4nb .asvca8; h 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-V power supply. e 1 t/7j; gqot;7jplt4nl0 )tgmzc3hiThe operating current iteh1 n3gj7o0tp ;tml7 lz;/gc )q4tijs 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 nep cos 6nd1ja,pf3f(c+eded 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 tran, tu0vpm0akbce4* -cwsformer causes 14 A to flow in the secondary. How many turns are in the seconda 4*k m0u0 pvc-abwec,try?

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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 necl8crzh qvg-,p.7/ e ocessary in a 110-V primary if the 24-V sec,vq-.phg7 /eclc8 rz oondary 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 2000zaou 8l g3y0(b-turn secondary coil. If the current i ou8 3aylb(z0gn the secondary 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 1001 v cp)6zoy+7,l g7kgfw7hmxy % efficiency, how many amps at 24 V can flow in the secony+cy vgm ,7l1 6w7 x)gpkfzoh7dary?

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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 145, wv gywa5vk0.0 mA. The primary coil operates on 120 V. What does the pry w5kvav5w ,4gimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil awdtxp8+ ;2kl3 i( r)lp;q sxfmnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage i3pk82)qixx;sdpt( ; flm lwr+s 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 p8ha:4abt;-sk l2aa a vf ;md560 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wh b-p48 aad;a5vkfmah:2sta; lat current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1e5453fd vekx k00 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 seke vf4x5k5d 3econdary 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 has 200 t f8k xmvv(7a;ourns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondarov;vf x8(ma 7ky 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 hask: r135+bmxok a e bx1)lq-dct 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negle tm 1b) -xlaq15ekbdkx+co3: rcting 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 curfl a,q4p2ua gwl+4ss( rent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prima(al4fgl s , q4sua2w+pry has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The va,am -l w)mepcf2k:3 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistp clw3m 2v,a-kame:)fance 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 yuv392iqu vupr59nl )at 120 V. The voltage is usually stepped up to 45005q i2 uyvl99)3nupvur 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 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 h04)4 q /z9lz ocqj6dy1tvqme50 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 transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the originall 4mtz1 q06dohq4zv/e)9j yqc 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 tnt :+bb pn16n2nu 1xz7i a pws9-wwgy.otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a t:-gpwuti6p+wy 1 n2.abx 971 zwnsnnb urns 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 transmittecprfm- 3:d.nt, 5zt 1e48k bqkdrcg(p d down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 Vp .kc :kztdnpbq(c358er m,- 1 gdt4rf?

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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 sxc, sniu.kg,p4 js, 4is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to 44x ,u psc.ig,ssn k,jexceed 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 muwih mo, q9)my:ch energy is stored in the coil's magnetic fi, q hmyi9)owm:eld?

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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 1y5a 0f ls p;h8o8oni okt-31qjv/us b78-H inductor. What is thiu0 ;oh -o /s vt7l1y8fiap5jsokqbn83 s circuit'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 ci4( jn/kop*lxln b.n-j rcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 122 fh4 gp(f7)oe qcotw20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance tx28)q jffvd*h0y79e nx s5dpof the lamfnq *5y8fxv2t7d9 hdes)x 0p jp?

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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 connectedyhie /o 06o4zi5flwz 0 to a 120-V ac power supply. What is the peak current thw /i540ez0i6ol yfhzorough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power sgzk/n:urt 5h25c wly1upply. What is the power dissipated in the resistor2nct wy5/kl:5 1u rzhg?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through aqayzxd 3ed30ghv 7b7 0 50-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 am zm7 b lf4fo39zgxv(yd ed2fl -u45gpt8z93z 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 8pab/;huh4j9 c9mx vka 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-mH induzscn+x0 .oaf-ctor 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 2.5(bzb1(l5cun4-*n gcb ms c(x 8 (gawtp0-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 u *:bpw67d.xo ox,yzainductive 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 inductbs:9vekx4 e)y ki ;k0bive 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 l10fkh*mfel;y0x/ ob of 20 kHz is apylh; 0ok/e xb0lf*1fm plied 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 2.5q-9:s1*;gby iew( / jyjombuc0-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 1ndf: dd j(fvo;t +l(t.0 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 capacitive reactance at us2dx,w4+f7/)oqbr s :lmv wl10 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 capacitfqf6fkj4wshw,wa(c* eb;igw;3-w1 , 0mgu gior have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactancwz7*axv 9 gbk re ik3+f-je ;*yi3,rzze of a 0.010-mF capacitor be 100 W?iryb,9r;i -wj f3zakezx *k3g7ze +*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 through a 0.v,j*k,5v aml q6sw+y a0010-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 rw08u o/csz1b fesistance, 15.0 W inductive reactanb1 c/zwu of80sce, 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 15vx9 r0)q2tcctt ta.,i 00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFic, trt x9cta0 tq.v2) capacitor 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 anr9ytzq 6 cdba*(u9 kj9gle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacid ayjru9tb9kcz6 q9*( tor 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 ina w wndkz.t,da-a2-z/ductor, what is the imp at 2,-dnd.wzz-awak/edance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the pbtmbzjwz4)6( cd 72 cwhase angle at 6c2bw( 7dbzz) c4j wmt1000 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 anm qo, a ( 0,oaawd84n af2j*s2u-licrod 1.0-mF capacitor for a la du-ajaao mwfncq*(80os4,2 o ,2 ritotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W r 7ivz2 ii1sjxhv)v kesn1-s/). ep ja4esistor and 15-mH coil to get a total impedance ofski j.s7 /sahv)z2e1j-)i 14pexviv n 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 at3r2i:* d dduek 5000 Hz for a totalkre 3d d*:2udi impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100qpc (g+rpd8 h3-kW resistor at 1.0-MHz for a total impedance of(ph dgcpr3q 8+ 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 c els 83fp8.aucapacitor. What is the impedancefas38e plu8c. at 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 fodd 6/jt virrdtf 02:s6r a total impedance of 4 6drtr60 dfs2id/j:t v5 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 capacitor atgxwmu p+fga.,c23z5 xqt/jh( 1.0 kHz for a phas3xg/ h(2 f xuqm5jc,wza+g.tp e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resi s1l1(ue 0 6i2jse8dqn l-wsqbstor at 1.0 kHz for a total impedance ofs1u8 0es sqlbe-ij q6w1dn( l2 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 is theu 5-*7r o.si cz7.ts *dohoxhz phase angle?z o*7-h s.t.ro5oh*s7zxuc id

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, (aon n:f 7wkdp5v7(wy-u2 nd/ j 4) ksku:yaim20-mH coil, and 1.0-mF capacitor are connectedamviw7wsa:dup :u5/(2n(on) y4kk d fn- ky 7j 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 10am(ll j(e 99gm0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is col al9m9(mjeg (nnected 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 induc zcs+e0y1chtz-)rclf*hw7g: p56z cp tor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thizcrsw* 1pc)0ecl-fhz67 :g h5pc+ tyzs 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 dur5tk5a3;sv* g tb3econtaining a 50-W resistor, a 10-mF capacitor, and a 0.45-d*ae;5u 5tvkrg3t b 3sH inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angltdh+rx. 0qqx7e of .hx+ rq0qxt7d $40^{\circ}$ 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+:cfza,e wtu0 , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferu,a0:zftwce +red 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 witf7h*qblz qdtn:kgt g:*ki5guk( v - 94h 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when t q9 4fkz*u:gd:5qkb*gtnh ivg kt l(-7he circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cay,qcfmbz)5x,3bu75sa ivy 0 ircuit 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 reonwot0 cwf l+d33-q syn( -s;dsistance of 30 W. What isfns03ds+owncdt - lqo3y;w - ( the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circhys468*b ez w 9y8) u5hffn :2mhdauxjuit containing a 50-W resistor, a 10-mF2a*u u 8s)nd:mf 46x 5hzfh9yyhbej8 w capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF f0xj jllj.g /: ys41fvcapacitor and a 15-mH coil in series?jj . fgsx/lj:4yv f01l

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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 seriebj 7irm/l4p.zs with a 4.7-mF capacitor for a resonant frequency ofmrli4 bj7. /zp 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant esvcmh5znhio,35;u z+, 4 ye lk-ko)dfrequency of 1000 H,h i-zee,kmy s5+uvoh 4;3dczl)k no5z?

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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) wnfj1x0) lnuor and a 40-mH coil if the re nwux)1nlj0f )sonant frequency of the circuit is to be 1000 Hz?

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