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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 magnetic fluzb8xfc6s,zp4;auyl 0x(ht( i x 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 inductibcx,5plf v8u* on states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil p ji, hm14y on,cged6 wzv8me1,roduces what kind of change on the indn,1m 1ivyzde,,6eo4g8c jwhm uced $emf$, 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 fivf2nt e/ rhdcbq43*kmih* 5u4 eld through a loop of wire produces what kind of chang/b5* hh*c4utf2rq 4k3endmv i e 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 whej)4hq; qaqwe5xpdyr1; ) 3d hat kind of change on the induced1jh ; qewraqy3)5edd x4q;hp) $emf$, 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 azmx a n*/mo7v -a8f.zv 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 yw(u,ngi3jz8k x) b1g (n/fg acilq 02an induced current in a conductor will be that which tenkx3cg zbun1l2y wii n qj0af,g)8( g(/ds 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 7xoedrb n.zw.4+;e7v27 zwac 7u 1/ptv zx vuntable. A bar magnet is held above its center with its north pole pointing down. The stationary 7cd.v oz/2nze7ztxxv.rp n7+ uuea1 w4w7;vb 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 a horizontal table. A bar magnet is held above its+xqjmji592 jveudjz.(8; ba z center with its north pole pointing down, and relz(x;+5q u2v9 m8ajj edzbjji.eased. 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 top0hcgj*xa9 g 5i8f;zerx 9-zq9v2otxl in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is t 5f z9 ;x8vth zcaxireg99- l2q0jgx*ohe 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 iv5 :p ys31r1erka83ia h*rbxa region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil a531 ybi8krreh31 a :is*rav pxs 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 thedw9:3b ejj8m,f3qf ql magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in 3lmfqfb3 dw,jq98 j:ethis 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 l0ayv6-8dozk ym u z.u,ies on 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 zdz 0u,u.ky-8 ym6voa 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 thromui wzf *b2::fugh a loop of wire with the north pole entering first. As the north pol*fz biuf:w2:m e enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire iluj 9rlpp9wvr)/ +p 4ss rotated at constant angular speed about an axis whose direction can be pvl/p r)jrw4p 9sul9+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 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 cux5uzmd tez(+rl5ix pi0.eoq3h * 4a, onstant 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 rotlxereuot i za+x3 0*iz,d.hm 5qu(p54ation 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./j*/s hliorv76i azx0
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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 cik*71 2ld1zuviy xeya( ytix(j 7,v1that 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 field. Th;y +ex, ax24iy- u 1visixuo4te $emf$ 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) is moved northwarndqg j6 crbgly0u)r:/zv)8*baz c .q6 mf.fx;d at constm8rzbqu 60gj/c .zc. :)d;f *gf)6ybq lrvxanant velocity 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 angl tj cp0:t4nd3sp*x .lular 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 generatoi df xf1(gn7w5r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. f(4kzwtcnj 4c7s50 n bThe frequency of thezw0(sk tfj4c7 n4 cnb5 $emf$ 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 useqe my;.n4gm0dg0a 3q svt( hx,d 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 thatxf*ing *p-o+e

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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 loopsh0r2p e/y cz)q than the primary coil thyc rz/eh0q)2p 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 pr aurn jerqvm 3;w.+o,(imary coil contains more loops than the secondary coil then it is a orw3nq ;ma,+.r(euj v

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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 iz vk2 -g6r/gqryc:o49;uzycq nput

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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 circr 1su qn6;c /fb2ef*szuit,

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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 battery of convr 9/twjq4ukh.ct:6gstant terminal voltage. At the moment contact is made with the battery, the voltage a ctktuv 4g:j/wh.9q6r cross 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 l0 bbeksto z:0gs6*-rzy9 v0jx( wan 5are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor iy ke0:n5zwtjgsr sxv(z9 6*0lb 0bao -s

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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 a6p.ad r(3vmatpah58 ind 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 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 inductayzln3t: x/.(* l hlvhonce 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 batte)yqwsudm g: h(8oa9n qzfn78/dhz1x/ry. The time constant for the circuit represents the time redhu(/qxaz n8g8dn f s:9 oz7)1mwyhq/quired 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 s i tn,yrce07/i. ghi09yrvg6veries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit re0g i,.vt gve96yhri0c yr i/7npresents 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 hak 6.:g a*rihqkve 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 an AC power pgr/6r5r nqjv3c 2 pm; )p9qe4qifl;nsupply. 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*l6 :i ( k9ppd,ue:1zhkql pqly. In this circuit, the currentp l6(i pule :k,:z qhp1dqk9i*

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what fac/lm2a : l/wvxb6x:x ydtor when the frequencyxa/ll/: 2:xmb dv wx6y is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is dou-q3r6 cg ng;p 0rx.yypbled, the inductive reactarcg;.q r6xp0-3n yy pgnce 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 acrosb8/( g iocl)sxs an inductor approaches zero, the inductive rel xci 8o(/sgb)actance 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 ci,p,*g0y gbp3 ivifyz .rcuit, the current.gzp v,gi, bpifyy*30

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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 circ5q+uvsl g /u9juit changes by what factor when the frequency q uvjg/+5l9s uis 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 approaches zero, the c95t id ob*bjypr. )ij1apacitive reactance of that cjpb 1b5).i9 *jd triyoapacitor

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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 .;q48tqdwy it j4j5t4e3w/g fp 7pdonbetween the voltages of the inductor and capacitor in a RLC series circuedy qjd47t34tt o;win5 4gfq8w/ .pjpit?

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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 dv0* 1a0b ruyvcefined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasesrhc,ut27 (dn0l5pj aioe +v d. if R increases. When is this statemennh.lju2a57 0 (+od cetivp,r dt 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 inc sof +y8+sgc(kreases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incr6/mv yjxua-9 . 9-b7k inypfwseases 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 anv544ofe t ;gjx 12mttqd the capacitance both double in an LRC series circuit, the resonant frequency of g mj24t;ftox5q4 te1vthat 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 applied voltfkicsn z2vc y(t0ug pd68 f(+3age. 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 z9tn r7.y/rw0c 2*nu5yg oh)v:h bbvtRLC 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 rt,d*,x+:4x lb jq c6c* bgdffpotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop fd6,4q :xfpgd cx*t lc*bb,j+ 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 a uniform magnetic field ofm:q0hi4ctrnq/5 p v 0p 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneticq/: 0i hm5nqr0tpv pc4 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 magnetit2;d2 kd 5pwguk(cm:oc field of 0.20 T. Find the magnetic flux through the loop when the plane p;ctd: gd( wk2m25kouof 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 adjus6r g/p rdv6u u6-1i;ytwqrn8z table 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,k /soz d)hq8jm $4.0 \times 10^{-5} \; Wb$ 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 sidesbrh)sk xp4 a-c kwh9jy+*ps;. 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 j- a 4kw9xp .brs+*hy pk;)cshs, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of p9lg jimdj 20npw49(7qtl xet5+b2mg$0.40 \; m^{2}$ 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 areza*-sj e3m fux0-hm xxj(a4.ua $0.20 \; m^{2}$ 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 fldthm*e 8 ed1l(eaf5;hies horizontally at a location where the downward component of the Earth's magnetic fiel(8dtdehh*e alf;m1e5 d 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 a t+b6n2hls6r 9psml *qeo)b.th vu e:(t a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends w)s.+et *mhtrv66 n es (2olb9qbh:pluhile 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 kdf/w2h( qm b.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 owni5ygydg of)7x fo9c0n +13l f 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 $emf$.

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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 opcl it/,ev9s8l6 ep:rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will b8v,9l/s:tlc peo pie6e 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 ocu i5 r9p+aru/f 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 wisepk6d)0c2 .p hb-y mxtu:h. syh to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.hk)e2y pp. x0-h.6t ydcbu sm: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 generator with a m*wvgfb:)ak5sz k 0:v jf6rth0aximum $emf$ 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 motoriwd3s c5q9*v j have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Th c5mkol2a)l xln x,8r4e motor operates on 120 V AC, and when rullaxrkx48o5n ) ,cm2 lnning 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 resistanctvg;8o+p gyrf5 2xgc 0e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cp c0g52rty8;vx of +ggurrent?

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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 resisty) ,1c3 n l/lwo3ugjdcance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ,cl3dg l 1wcy/)noju3back $emf$ 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 connec;rn( tqk6sx2 jted to a 24-V power supply. The operating curren6(nt rk xj2qs;t is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to r3 0:7qs f bkh0ibzh-i1svg an4educe 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 caus bnjt3*z8 w-oles 14 A to flow in the secondary. w tn3bjlo*8z -How many 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 turn-n)l nv7smlf 4s are necessary in a 110-V primary if the 24-V secondary has 100 turnm7 nlfs -v4)lns?

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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 primaaf3kfo1 xh yx8cidw ry+2v8:7 ry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cuofkxw r83y2+78cdvax1 i:y fh rrent 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 tra ke dc9t8opk( e:0 5d2nb(dar;cemqn )nsformer. Assuming 100% efficiency, how many a(k ed n do rbkt2)en;c(mcqa9 5:d08pemps 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 neo7p2tan,l6 czr yrut; .n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Wrc t,tl26 nayu7z p;.rhat 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 turnsdaw m z ece)1ji8( 1or32qe5cl on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltago8c52 d(q3zm wjale 1e1) eirce is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tu x,j(cl(, rykw og*v*k7a h8gcrns on its primary coil and 300 turns on its secondaryj ,w(*(rl y vkcgk,ogx h8a7c* coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seco)ls x:du.pk7tfae 7wf+ d(q)jndary has 200 turns. If the input current at the primary is 100 A, we can expect the outpet)f7lwuxqf :jdak+. 7ds) (put 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 11e /1bfpqo1dgogmg5+6 ( fzgi00 turns and its secondary has 200 turns. If tg 5( fdg1qg fgzp1 1beio6o+m/he input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hx gl:f drwu5dl:d5; /js3bt6 has 200 turns. If the power input to the prima : r:/jtwxg5fs h6d3l5l;dbudry is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 r3q7hrks a y8 utu14/ebvc g(n*,zqn*V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power li/n8vuy(4r* a1qkc3 r*hb,tgn sequ 7zne of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at a8z/eqkzq/ g5 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 poza8e//q zqkg5 wer lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepp6b51v9j npo 8*:klbtm6 kxp mj;z4i wded up to 4500 V by a t1zi dl vmkjbn6p8 b4t5:*96 kxopjw m;ransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 ku)m(u7l 4-)nuz zwthvy q 2xc4m 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 turn4 -4wumqczhtlzv(2 xu yu n))7s 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 resistan y/i(e((*w/k7b mt ui( qrgbavfaej,8ce of 0.60 W. A generator produces 100 V /etk ,ar/7wg( *i f8b uai(e((mbqjyvat 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost 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 po2,pye;6pcm20/.ja vzmsd hluwer would be lost if the power were transmitted at 3000 V instead;/sjp0y 6 pdu 2m m2zh.aclev, 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 lbxv1fmmt g- cf;2: i*zan b5o8ine 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 isg-ao:*vftb ;xi1mbf m n5z c82 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 muf *n1yjg.k qh-ch energy is stored in the coil's magnetic field?qn.gfh*y -j k1

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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 containscsy2r/dzyn;av*8ddz* b,h k/ a 6.0-W resistor and an 18-H inductor. What is this circuit's time consv sr ayy8,/z2 bk*ndd/*hz;cdtant?

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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 2dy t9xkqf56can 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 th gg4 d,pgo1 76idm.fpre 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 jqwk aw5b87 g;i +vd3l120-V AC outlet. What is the resistance of the lambwq;+ 8 gv k7wli3dj5ap?

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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 cownfgk *cs 1/c)nnected to a 120-V ac power supply. What is the peak current through th)cw *sn g/f1kce 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 zn6,vw;l;sqs to a 120-V ac power supply. What is the power dissipates zv;6;qlwn s,d 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 resistot0h: xo k6arx:r is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i;cd.ffvz03lw 7 til i2s $I = 0.80 \sin (240 t)$. 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 resistor is16 9 ugygpev;5*qecsmru2/m l $I = 0.80 \sin (240 t)$. 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 qi2) vuj 9y46mntx)*9gk zthqof 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 reactantgcz ,jxzhacgx/ v3 y7:vtl fa28ic7)6ms 7/ece of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancet-+j5rmn /qe n4g:kgi?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 H5rf7wf3mbf e4z?

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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 1cqkovq -+3ax sk- 3:u*bwgg;k20 V AC at a frequency of 20 kHz is applieb-3; owqs: k+gq vx-*akguk3cd 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 wv23fg,:)-m*b6ovj w: rhc 4tbbpfwp 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 cqo(q0c 5* fnffz/ :ai7d jxl7zapacitor 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 capacitive reactance at 1v ja:qa( (rkj30 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 1200si7nqwj9ytwaj )n 31 ) 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 reactance of a 0.010-mF capacap+jsz 10r2bgk.kkkyf,u 4 d2 itor be 100 W?guk1ry0j2sd,.kb kk4+a 2pf z

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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 c oq(o h4hq8l9z7repb 2apacitor 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 seri h.;*cfinv9 gwes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive fhvwn9.i;gc * 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 k- yruit+u4-b 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoru+iyt --b4ukr 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, asv t.f30y myc23tq3.nhf3 lhm nd 1.0-mF capacitor are connect qsv0.l3fc3f3 hy ym.2mnth 3ted 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 mwkry2 1slr elk*g/v6a m:10**naqip series with a 20-mH inductor, what is the impedancee kg /kna:y*srl w 06m1m *rvi*p12qla 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 c*fmi4a6.se*m, yx xkwith a 20-mH inductor, what is the phase angxi msm ae64k.fy*x c,*le 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 w1)q+qu(8 s7 vppfzggoith a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at ()87v fuoqp1zqsp+gg1500 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 capacita( gp3elt5hbipb3 w 8np4dz;k;nces is needed in series with a 100-W resistor and 15-mH c3d ;te; hz35wp (8npbp4gilb koil 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 jsbg eln(xorc*n8 * p+z8phaw 3.+bl8be put in series with a 450-mH inductor at 5000 Hz for a total impedance olpgz8+bns+ nabp*j r 3c8w(8 .o *xhlef 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz e6,nf6g ki4w s tx5rikr6s;fb q42v1yfor a total wk,f1k546x4qse yr 6n r;i vfgs bti26impedance 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 i0ahdgn a/ ,x2zn series with a 20-mF capacitor. What is the impedance at 12g,nh/0x d aza000 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 semgmyco7 ;-)ruries with a 10-mF capacitor at 1.0 kHz for a total impedancuy ;m7r) ogcm-e of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with2en-. pdihk-e a 10-mF capacitor at 1.0 kHz for a phase ep2 i-ned-hk .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 yfnpls/zx hj7;y3w0* in series with a 30-W resistor at 1.0 kHz for a total impedance o3yy0 *pj/f7xnh ;slzw f 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.u1p ks.a6r0m x(jmuy -mF capacitor at 120 Hz. What is the phase ang .uyrku .sxj(mpa1m06 le?

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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, 20-mH coil, and2n an +zm9b6j2yqd do6 st.l2( iz1jrq 1.0-mF capacitor are connected in seriy1rj ao6j d9(dq26qi.+ 22blntzzmsnes?

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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 capacitor, and a 5eoa0o:bwx t2cv 8jvf0w 2bu0 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuijwfxw to085 o2bbc:0ve2a u0vt?

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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 capacib2-gj8 j g9nzytor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circu8yjb2j-gz n9 git?

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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 cirpquga: tt0 b+0cuit containing a 50-W resistor, a 10-mFg0 qt0bpa:u+t capacitor, and a 0.45-H 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 p:v.6z 7k 0fnbzy7bks,r( tbw series with a 500-W resistor for a phase angle oytb7 p(v6,:7 bfz k zr.sn0kwbf $40^{\circ}$ 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 hj+to 6sc109k2f i3 zt0ncrak xal0qc8as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the cir 6 02x8l jc103z+k0nqt oia9kafctsrc cuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ak yu 8t6/de5zw )blsl9m;ji p4c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power su w l9te;/6uy4zip kjsdmb)58lpply?

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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 c f6rleh6spkd82 xn+g 9ircuit 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 re3weq(79enk frxohctk7d .85 qsistance of 30 W. What is the pqkqchnf57t37x e 89dwkre.(oower 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 circuibqtb9 ht/9(y-,ivh n nt containing a 50-W resistor, a 10-mF capacitor, and a 0.4b99,h -n hybt iq(ntv/5-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 capacitor and akc). lj 09a+n bid7mea 15-mH coil in series?7d.n cl ea9ib0ka) mj+

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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 series with a 4.7-q1k gp tx7tk53mF capacitor for a resonant frequencykk7 gqtp1 x3t5 of 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 witfy1c2p6m y 9e6th 4tl; c*kmogh a 3.7-mH inductor for a resonant frequency of 1000 Hz?6mytlot6;4ep ckf* 9my 2g hc1

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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 benvx.-jsdnqv0:x v7e b k4 w49r placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is t9:d4rs0en.jq wk 4 xb-7xvnv vo be 1000 Hz?

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