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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 oxk/ qlws 1nhz y06)h:vv0yr6vf 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 that tnjrb*bg9s*; :xzho)rhe $emf$ 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 w pd5qj jvq 0(-oz)+ep4xoxv( ghat kind of change on the iodvop-4vzj x5+ j (ex)q(gqp0nduced $emf$, 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 strengthn.v8v9 lgjedq:s4 sjy., f4oe of the magnetic field through a loop of wire produces what kind of chang.qf,ys vgej8: 4j.l4nd e ov9se on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the indui .x: e8ectg2d ,d(vyfceydet(g:dc v .ex8i2,fd $emf$, 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 magnetic field an 6knbm5wazvg*h75e * z- *o rwi$emf$ 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 aonzkya:5lww i-x pm(y u;44t2 conductor will be:l kop4w;xwy (ut5 ina2y z-4m that which tends 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 r/gv/s66-4 2esvbag,iwzlgmflat on a horizontal table. A bar magnet is held above its center with its north pmzar/gv64-wil, eg2vss/ 6b gole 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 )eg3b 5q7 sjuaiokpz636q9 ,f :bzdfvflat on a horizontal table. A bar magnet is held above its center with its north pole pointing 6qga ib 6ku:b 9p)e,ds 3ff3v75zzq ojdown, 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 zvq( xos- eu.i+a-88 .kutvv vtop in a region where the magnetic field vector points straight up. The magnetic field vanishes svsuutqi8e.v-x -.8 vz+( avokuddenly. 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 tabmv;+;o p1y37)bel /zcvosr, x 9ul zkale top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. oz y xeval7 l3u;+b s9zm/kc)ov,1rp ;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 nfq.2 6)yxo1xs85r ti udayt3in a region where the magnetic field points stt15rxa8.x)n2tyis 6do q uy3fraight 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 horizontal table and ca9c ewwh6*w sc)rries an ever-increasing current nort9c sw*6chwwe)hward. Two coils 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 1lqk,uz1 k8m u1hd.a3 gqmo g;.z7)fdq ol8p cpole entering first. As the north pole enters the wire, the induced current will be (as viewed from above);1clzkg.l)7f, m1koha gq uqu 1o8dd3. 8pqzm

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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 ado b ut;95tnz0ngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orie5 ztotn0b9ud;ntation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular p)sc-r hh-)zss, c1u1rjk8rv speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the or r vhhs1szspk,ju--8))r1cc rientation 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.2u -0 qh0-2tqmqfwezw
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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 aaqu bhz3-mqb +gr 9c +b3h9ex(n $emf$ 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 magnetiuo21oc8,-fjwlxx ;d 8t b/ facc field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) isve 1(0+xuhvj h moved northward at constant velocity thrheh (+jvv1ux0 ough 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 cov.(u) sfok+k z9jb3 sonstant 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 transfo +d m09z*gsk v*e utc3xd0f4rurms

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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 n l:-ccc x1hgbnv4;n9 frequency of thbn1 ;nncc-v:clx94g he $emf$ 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 top * 3g.l64 rcz:iw:mahnxj hjbbt;x -2

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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 thao2 .hpdqaxg27t

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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 c- str85e 1-l3tuz(,rzc t*z :xwqfuocoil contains more loops than the primary coil th uc,3rc 1fzz:el5 q8xo-(*rtt-sw tuz en 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 pqw 5 )rg;:bcbxrimary coil contains more loops than the secondary coil the; qc xbb:g)rw5n 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 powerkli/s 1 l 5oap*,se;hm ow,;pu :tl6nr 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 cirzm91h 1 o+ e x+o9ovnmlxadd3f1kp,7scuit,

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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 9nx9napf5jb 1 series to an ideal battery of constant fn5a 9x1pnj9bterminal 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 inductor are connected in series to an ideal bhi -p3bo6eby055 hwprfga4 s)attery of constant termi)4 o 6 ip-5hhpswr eafb5g0b3ynal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectewfezz5 tx .18h-ve3 xhd 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 re .h x5:q3glhwisistance 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 zyd9h2 fkt65i connected in series to a battery. The time constant for the circuit rf2 tyki d69hz5epresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seri,qh 2n;:j k :aku4gkc)rro:xaes to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease toc2:)kqra;xgok khn4:ua:, j r

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the followingc2)nf m 0abwc,4;ys + witl7ys have 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 connected to yxfbh xu:k*+vzup ;895sf1 y lan 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 connecs*ra1vje.3ji2xt i u4 ted to an AC power supply. In this circuit, the currentii24 *u1tvxj a3e. sjr

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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 me gi0 xa+x* /;ojpmx;changes by what factor when the frequency i+pa0o;xxme igj /m x;*s 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 thek 0w9w-.eklrn AC voltage across an inductor is doubled, the inductive reactance of e-l n.k0wkwr9that 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 avvifd*r4.h x ( /0emhkpproaches zero, the inductive reacdh fmi(k*vr h4x./ve 0tance 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 connect9) u u;k+mjztved to an AC power supply. In this circuit, the currenu+kz;jvt ) m9ut

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the q;(opywq ej ds( yt1n*k 8dx7z;t 6;bqfrequebdty d xkeqy8jnp;(;qtw ; (* 6oq17szncy is 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 capacitor apfpf:6q m3+ tkf;xdq/ kuc+w8pproaches zero, the capacitive reactanuf +k/p 6qcqtkdpf38m fwx+; :ce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betgc /8cai q2pb45m ,f(37xbh ub1nuikxween the voltages of the inductor and capacitor in a RLC series ciiph xa3c4mnkcfx2 (qbb7 ug i58 /1b,urcuit?

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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 as wxf4p2 o) 2z8lp ysi92+ (qujdxs4 v mu1za+rv$\cos M = R/Z$, 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 q+x0je /it ryb/+*4qplm ly/zthe circuit increases if R increases. When is this statemm 4z0x//ejiyr lyqb+q t+ *lp/ent 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. pu)y,md gwa11*k .bwj The impedance 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. 4plfmpwpp-+ 85df f,a The 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 sklz:;z(b; dq2 2tiaz ts z;a9geries circuit, the resonant frequency of q;glt szzz i9k(;z2tbd ;2aa :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 dr1k(r3 dnb1q 7;ewd m0vbtmym1 iven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wm w ruy9:z18sc t -og9bh6oh5bhen

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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 unifoej)xwg : k)hg*rm 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 parallel.))e*kh x gjwg:

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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 field of 0.2hshq;qcp -h )t9*sh v40 T. Find the magnetic flux throu-h sq9 qvspt)*ch4 ;hhgh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0gi7t l*ycfb(ie o /h+).20 T. Find the magnetic flux thro ty+()hib/cfo7l* ge iugh 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 skx9rs:hh,pb 51 1 rqusingle 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 changw o,k d9vqkb:;xx.zy 5,tozp 1es 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 with side( 2q nqdtr 48a7smfy hs1xs2u9s 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the 2uqastdr7f 9 ny24qsx(s1h 8mfield 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 1it;y 9/i2irk d5 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 a e*3os8k.s e.8dlpbv)e:bwf trea $0.20 \; m^{2}$ 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 horizontntv e m0d5km5.ctg47nally at a location where the downward component of the Earth's magneticmt m5et4dvg 7 0nn5kc. 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 rota(o*rr ix.g cg2u8 kog0tes at a constant angular velocity of 2.0 rad/s about a vertical axis through one oukg 2goixg* r(.c80rof 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 generatoiuil h+ti49w 9r 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 t:c il/chaku02urns 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 rlmm ck 2mmg3*8ectangular loops on its armature. Each loop is 12 cm long and 8 mmk*mcm 3l2 g8cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, 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 o.xa p-gnh. nc1f 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 constructnxz:u6 0yn .1dcs n ttvqyh)42vr)1th 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:r)2 sn1h yxnqn6ctvzh udt)ty10 v. 4 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 v gd7ccycg,w 3(ee n79generator 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 resistanxf yn+(: f,nruce 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. q 03t-yz a 0coq/tx- mlkr7t 48fz6iju The motor operates on 120 V m04zioktqt8z/ 0cjx6qar -3u-l yt7 fAC, 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 resistance 6.jhd3m2ue 4w. n0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr34ejuhndw 2m .ent?

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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 conwm fhm *x rc08z*.lp/f*lnh u je.79ynnected to a 24-V power supply. The operating currentmzjlmf*xln y0r7u9. /enp*w.cf 8*hh 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 interna .; jrcx)+tdbxr/ri7 bl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back)ibcrd/7; +xt.bj rrx $emf$ 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 ne; uhgya3u bof) 5(os1teded 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 pr+ -3gf(s e9yvlczo2yfimary of a transformer causes 14 A to flow in the secondary. How many turns are in the seconzg-ef9(l 2cysf3 vyo+dary?

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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 mg aa i5f(nt ) s:ijzw6w3;2r7f;kjlnv any turns are necessary in a 110-V primary if the 24-V secondary has 10a) skw3vgritz5:j6 a ;2n i;jlwff7n(0 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-tu-:ii fqtydd-xu *yd;0u6 wz 5jrn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thyqyu;0 w-d5:xjiztd-u i6d* f e 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. Assumnrbzyn:y 2 /u.ing 100% efficiency, how many amps at 24 V can fl y/:br nuz.2nyow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10v.+ m6b sqx/ez3pi3yxg o:.de.0 mA. The prb/demqp+ixz.3o6v.y:s3g x eimary coil operates on 120 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 60 turns on its primary coil and 300 turnz4v uhv2yvr )izci(qn,i 09r( s on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is p(hiicvqn 4,2vzri9uy z)0r(v resent 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 60 turns on its primary coil and 300 tuthr6sh1nr 8m. rns on its secondary coil. If 120 V at 2.0 A is applied to the prima6.hht rmsnr18ry, 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 transformer has 100 turns and its secondary has c 5+wdq9gs5/ slvq -v6wy j5fv200 turns. If the input current at the primary is 100 A,d svfs5c-v+lgyvqq9jw5 6 / 5w we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 t:,ajec 9/3lghh+ g cagurns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect t,hcah: gc+a eljg/g39he 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 trans)n,t t :wk1kybformer has 100 turns and its secondary has 200 turns. If the power :,nwktyb) t 1kinput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cu2r e1h+td u(:ou(ql zfrrent 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 primary + h21req(dfto(zuu l: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 voltage , ih gxkc4:2la-cynz: is usually stepped upcyc,ilgh:k24-n zx a: 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.

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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 ar lzfex:b00*7(cchue(pasi fz 8:ur: t 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 vozu 0le r7 cfcause0zib(:8* r:h:x (fpltage 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 54*nqn:o+z 0at9 o y(n*u9xsy(fbd w ro0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce en9*(osr0yqd:o9unzxay4wt +n( bf o*nergy 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 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 0.6 .mt6pmi hp2ly ih*b.80 W. A generator produces 100 V at 70 A. In order to reduce energy loss dumhbt 2 .p86himl*.iype 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 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 linz/nfr 5 i9m8bs(i.x8h tr0ktfe at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V8tm tkrh 0/fz(xn5if.br si8 9?

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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 trau58p9g bntt 2 i9ic )v/xtf6lfnsmitted 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 inut9958g/2 n l t6ifvixcf)btp 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 isxb vx8./jb/i;y/p+fk)c hkf0c3zu f e stored in the coil'0 cvz//3e h)c.ku xffp+xf/ibj;kby8s 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 7c ut+o j bgp0s,a2l1)ivck f+inductor. What is thisp s k1bc7j,02 tvg)lac+o +fui 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 i;/ 0;/ gunubviikqo1 in an AC circuit 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 120-V AC outlet. What is the peak currentioz:/(h zhl9u?

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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 ,hf:bo*shi 9 aresistance of the lama*9hf :s iboh,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. + * dg/hdy 7rio9cuf+m What is the peak current through97 /uyr* cfd +mhg+oid the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whaip b9q2 oc6ux,t is the power dissipated6i9qcp ob2 ,xu 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 resistor i78 gn r(gjnz)9yie(uga+01pr o-w epv s $I = 0.80 \sin (240 t)$. 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 b*m bu1.g+ja uskf p 44o)b nv.xar:j5a 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 resiuh3jooy12 *z9 qnen x:stor 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 lkd0z,q(umk+ ,+ncd mof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1c4 j0 )try qcad+ypnetd1 n/,sf 5-8wm000 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 eog, d5h;-pjq 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 necessavw eay2 8d:4c(2rt eidpyfpr+, z2-dj ry 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 Vj +)l r/vw tt05a/gxlqqaxj (2 AC at a frequency of 20 kHz is ap0 + rawvj)(axt 2/ jlqg5/xlqtplied 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 sour)9qm; b x2.dl zy/zcidce?

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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- , cekram2h *d3 vde.g,net,.amF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capamyc+z- : o z*tbp2f;jcmkcgul ;qp2:.citive 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 p *lliv 1s4he5l*,mjn10-mF capacitor 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 capacg p k (u/ m0l:qk7vk,cs7o6qviitive reactance of a 0.010-mF capacitor be 100 Wv 6cg:kqkuvm0po77,kq s( i/l?

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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 z- co,eb w).cn5fk ef,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 witho,k 5:m(ntitq 12.0 W resistance, 15.0 W inductive reac,5i tmq(: tonktance, 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 impeda 3iw-d0 t)obw tuwxdskys;970nce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serietdw-ib0)k7 9u s0wswxt d3yo ;s?

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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 ac+.nyse(, dh6 /lv -swyit-d resistor, 20-mH coil, and 1.0-mF capacitor vceh- n -i6ds+t ysda/l ,.(wyare 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 i bsm1oy2j.bb -nductor, what is the impedan.o1mjbs-b b y2ce 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 inducl gn,y2jn+6al-oq,qb 7bhi w :tor, what is the pi n:o,g7 byh,-6allj2qn+qbwhase 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-mH coil and 1.0-zz2 +.n hxkw*fe vo3d kan(l0)mF capacitor for a total impedance of 100z0)onlk2vd.h3+f e a *wk(zxn 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 capacitanc+ xh6e) tgxyl6es is needed in series with a 100-W resistor and 15-mH g6hxx+6ty )lecoil to 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 wi7yco8u5 mecc460si x ryi8d5rg d3-pdth a 450-mH inductor at 5000 Hz for a total impedance od rcxrs86g0idm 3y po8y4u7 5c ce5di-f 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at7/friqj-jk-9le6l iij /u0s a 1.0-MHz for a total / ajuk- 9iel6i7/q -rs fjl0jiimpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is thtl 55.wzq ffc(e impedance at 1000 Hqc5. (t 5lzwffz?

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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 seriesshz7, mo7n0e7 + wtsoc with a 10-mF capacitor at 1.0 kHz for a total impedance of 7z0s+t7 o,sn ecmwoh 745 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 4e3w 1kh)ca p 5* fluq0mjskx(a 10-mF capacitor at 1.0 kHz for a phase anh1p c*xsqk k(uf05 le3wj4a )mgle 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 re*2 0jzxwlq ,fo 9ezwwi t),za5sistor at 1.0 kHz for a total impedance 2za, wf *ex5qzj 9io 0t,)wlwzof 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 withky6g 7mi 6q+pv a 100-mF capacitor at 120 Hz. What is the phasey+6kg6p 7m iqv 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 andnsp4grm5k. 5s s1 7kkg 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in semnkrp sskgg5s.k 7514 ries?

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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 capacitox7c6gm+fn 5fb r, and a 0.350-H inductor. The circuit is mxf+ 6cfbn5 g7connected 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 rv0t,guq 3:m0wef pd8W, and an inductor of inductive reactance 30 W are connected in serie3vr:f0 du tmg 80wqe,ps 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 contaay3 n j..orrp*ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tr* jp.ya n.r3oo 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 angl7j j **puvo4qge of*g uq*ovj 47jp $40^{\circ}$ 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, Ly:x sxl4z56 8l0s7m5gef1ch uuw1 kf 2onuu ;f = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum 6g51hsf:5zm8uku;1cfo0 2s u lxeyln7x 4ufwpower 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 resistance, 15.0bgsrx4 vqx3o2o v6w1 ; W inductive reactance, and 10.0 W capacitive reactance, when the circ1; 63rosvqbw4 2xxov guit 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 circuit isyj9iie+5ygv z, ;mb4h5w:in l $63^{\circ}$. 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 acjg32l /y+o zu resistance of 30 W. What is the powzgyu+cl o3j2 /er 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 circuit containing a 50-W resi+ktvaw wkp9;q:p2d ;p stor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a vpwp;kpkdat92q+:; w60-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 a9f8( 0zdx uvqo 1.0-mF capacitor and a 15-mH coil in series?q098uovx d(fz

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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 serit. :(i yoei 5,nzrkh9mao4s v)es with a 4.7-mF capacitor for a resonant frequency of 10 rko 9vnz ,ya:)i54 ihto(m. eskHz?

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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 c7bo3aw;wood0 yl*9m:ngw1g 3.7-mH inductor for a resonant frequen oycl71w n*3:9oaomg0g dwbw;cy 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 resistor and a 40-mH 8f7+y9wafyb uhh:yo5 coil if the resonant frwo 7fh9ybhu 8+yf5:y aequency of the circuit is to be 1000 Hz?

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