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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 unitsek k13vs*ck imt) :w)l of 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 5m9-mn0*,1 jvf i+mket(tx 5smhf xcathat 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 produces what :5e lf-*cuj0 s1jz8oc ;fh xvxkind of change on the induced1j*5jxcz0fs;h8 - cvul x :oef $emf$, 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 fijqr: kdf ft4rufe;o78,c b8j2 :gwy9zeld through a loop of wire produces what kind of change on2, 8ufd:t8k:gbzco j4;j9rq 7wfyfer 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 tuu7v3gq 2.xez he inducedg. 3z7ux2qvue $emf$, 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 m(0k z3skucu ka0hde. -agnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced c sloa jx)-g)+zurrent in a conductor will bo+xgz sj-)la) e 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 flat on a horizmqy6 ,momp ,ssai ,;3hontal table. A bar magnet is held above its c3pyq,misoas h,, ;m6menter 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 a horizontal table. A bar magnet is yrf4(i b t-: uol7 la7i blh01.4cizrlheld above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (wi07frlr 7ocl: hl tbui(- 44lzy.i1a bhen viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fie dgi ;pq x6a8y/gd4habks44*zld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of tg6sgi4;kpyh4 da* zqxa84/ bdhe 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 whereu0gfl;n ju29dv i/tu; the magnetic field vector pduj 0n2 f/v 9;gtuul;ioints 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 region where the magnetic h5tmb wmz8nt6+f z,h* field points straight down. The magnetic field disappears sudwm t ,8+hhnbzft* 5mz6denly. 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 hoogdrsn q141hw(1w mu vmw8x;k 7vt9x3rizontal 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 cir1mv ;m1wtrh xw9qs 4godn3k8xw1u7 v(cles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering firstxd-:np5r s *9n:/jg+ jqjtue g. As the north pole enters the wire, the induc nxpd:jngj5 :/ e9q+-rjt u*sged current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axe:;aqz*cf./+feyp w5*b 4ulf. ceeg ais 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 axiea:ew/.*ue5pg qy c4+;fe.bf* lzfcas 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 speed about anu* hb p oyw9a75rgv4* 7ftju6d axis whose direction can bd 5bh 47p6gu*fy *jwv ru7ota9e varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.ihr5) mt - l3qw(zlj/u
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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 1zy is9ei8 o4;zcv l5yabu52zthat 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. The;8m9mzi g5ln p (1aeggv1d v/c $emf$ 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 y nz1hj./k;tm east-west direction) is moved northward at constant velocity through a magnetic field that points straight downmtyk ;.n/jz1h . 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 angular1yfim lrtb,;. 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 transf zc4cxzt l ye q,++fvk4ejmv3z,8l:f6 orms

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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 revolutia+(8zcm3rcu eons each second. The frequency of the m8 uca3(cer+z$emf$ 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-uwl71s py :unge9+19qjxnun evice 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 thatp;z esq8fm(q;

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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 secondarybw3 qh1xr/a*, 3kwcb u coil contains more loops than the primary coil t3c*q,whura1k bxbw3 / hen 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 primar41wbuxa rti w3sb759(d f,a jry coil contains more loops than the secondary coil the,rt5rwujaxb7d (91i af3 sb w4n 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 po *wy,9t cv5yt fs.stwt-lz9 *zy*x ju8wer 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 circua chbspx,6nd,h 4;u o.it,

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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 conf0 jmt) bkwb sjh2f9-(stant terminal voltage. At the moment contact is made with the battery, themjh0tw b(fj -f9s)kb2 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 batte1uiwasjq5faoj 03s, rl 9h s2i( be2:iry of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indu :0lqi 5,hs3raoe(jw2sfa1ui 9js i2bctor 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 connected to an 1kqa ze/kbebe5n;r(3 $emf$. 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 induct /,tjn/ ncuc0urc 0ty5ance 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 batte4,*r srszd e4u; zhsa2ry. The time constant for the circuit e s4*zs z;ru4hdra2,s represents 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 art) ;t)nn 8t8t+ fpsnhue connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr8fn h)tt8p t)s +;tnunent 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 ex m216a:ga6 m7 ldgd06fnwtlojcept:

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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 sup (6p k;fgawuz8ply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this mzhok65 whvcd9e86w4 circuit, the currenczkh 5w6mdo96 wh e48vt

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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 ryoryy* 1ps8/ changes by what factor when the frequenc/ yr1r*o ps8yyy 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 a p/c4cf*y0ip(pi5a lhn inductor is doubled, the inductive reactance of that ciipc4(0* pfyha/5pl 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 th.)z52wvs v* mezvjf8 we AC voltage across an inductor approaches zero, the induc5v w*zjs2mv. )w zvfe8tive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this ci7: vo():bpk lp ywgho6rcuit, the currepo6: kp)wgy(vl ho 7:bnt

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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 byz/7 r;jldb ho7 what factor when the frequency is trihrz 7 jo/b7d;lpled?

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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 capacite ainlp n1,ww2y+8p;yor approaches zero, the capacitive reactance of ta+8l ywpn;1 2 n,ieywphat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of d-4wtgt+y; nd the inductor and capacitor in a RLC series circuin+td ytg d4-;wt?

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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 circusv-:l+x3x by8 iz a)urit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of thhs4 *dp8mh1 pme circuit increases if R increases. When is this statemenmmph*8pshd 41t 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 impe4 j rm(dptr jex4y737kt uh96sdance 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 imped cf.wlhxz0j23 *,dg kwance 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 dou:5rlo z 3r .,edvo:vouble in an LRC series circuit, the resonant frequenco.orue5lv zo r,3v ::dy 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 bytr7w; ./fln fq rc;ey/ 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 4ny4tbro hbqc y5l1332xi jn*fj ls*4v+c8 kkcircuit 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 rotati*0br o ccn-ofb;v )rk9ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when c9vb; 0-krbcr)onof * 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 rad+ ko*f )smq j2n:rhxw)ius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic f)2o)x mhwksf * qj+r:nlux through 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 hpx1 9nyt*8eyrotating in a uniform magnetic field of 0.20 T. Find8yyh9*nt1 xep the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is rs) frzmj39cl8:ev8 ua+b h5gl educed 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. +uuy0vms; n bo8bldls(w 4y9 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 tur rn8nc4s( y,ezns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 4n( zr yc,s8en0.50 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 d7w9x hm( 7y yn5.qyftcl mi0+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 fv(vrf+dgj3rfc+ - e/ (yb o/uarea $0.20 \; m^{2}$ 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 wifrg7 *ila,-d qng span of 60 m flies horizontally at a location where the downward component of tdgr- l*,7aqif he 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 o(.1e y lmp05qzx/ws z2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis t5(lp0 q.y zsow1/ex zmhrough 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 loops and a cross-sectional area f0b zoy1)g-y;vykzro my7 1 rak9*j0fof $0.25 \; m^{2}$. 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 bb b3jigsh 65(j4dq4/u7j qwkarea $0.090 \; m^{2}$ 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 31zb,(;*ig pnpp 0m1lcu zoymrectangular 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 be 31p(c mi;zz*bun,1p ol0mgypthe 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 o1z 8.2bkkpnfrf 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 get wcza -oh2u1n7l5sy:nerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is lnh-75s 1tacz o2:yu w$100 \; cm^{2}$, 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 generatoq,308l(p astjogz 3rqr 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. Thvsk0qpwz k,p9d e.s,o-:ww x4e motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ob)xk:p veiq6*7w zanc: ho0 3o78hsgoperates on 120 V AC, and when running at full speed it generates a)xen77 iog*qsw:8hv:bk cz6h 0o ap3 o 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 resistanj ((i;.l h1hgfh+l )w;uob bao ,jl7hmce 6.0 W is connected to a 24-V power supply. The operating current ij((gmf.,+lb b;l1;hwoluo h)a7j ihhs 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power uxzp2* ayy b:hf+rclp1fy*t6 4ss 2d*supply. The operating curreycdfs*2t hsblr*+ua:f4* xy1ypz6 p2nt 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 internales9/ ydfqa(yj (eq5.a resistance 6.0 W is connected to a 24-V power supply. The operating curea/dqfeqjsa ( 5.y( y9rent 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 i4mc ./ahy2hap s needed 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 transfon;r3 e14 n:e i3tiimbormer causes 14 A to flow in the secondary. How many turns aren;n1mib :oiee4 r33it in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V sr a z,- + 3oqd6d;j8ukl2p:k1ytmztbsecont +6zztpjksyud ;lkad3 oq- 812mr ,b:dary 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 af:kat8 kwy6 aq+dzv)*nd a 2000-turn secondary coil. If the current in the seconda*)k da8zk a 6vfqty+w:ry 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 thecpf:j de;l-8,ge 5mdc primary of a transformer. Assuming 100% efficiency, how many amps at 2:- d;gp5eccde 8 j,mlf4 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 neon sign transformer provides 7500 V at 10.0 mA. The p sb3t aur97bp3rimary coil operates on s t97 bpubar33120 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 6fl81 h1o.u6oc :v:s:bcgs xtb0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A i tbcfgosvcxb68 o1. :h1l:u:ss applied to the primary, what voltage 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 turns on its primary coil and 300 turns on ip6;6l ngd ye fl;-kc6,9ky+s caod e*hts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presen yg,ll k d+edk6yons*c9c-apf he;66;t 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 anda3o /pklhky lv(ch.s:.kfs r6s e5/2h its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output cu.25 .klkhef lrh(6yh3aovs/c:sks/ p rrent 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 turnf7:c,towd6e, t xc,sks and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the scd7s 6o,x,ft,ke:w ct econdary 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 hau ns;-jvtjh2ib xl7k7 (o4,fn s 200 turns. If the powuko ltvb hn7i(4-2jfn;7 x,sj er input 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 current at 120 V. ; t4k0lk kqi6c-,irnc The voltage is usually stepped up to 4500 V rc tcl-k4;qkkin 0 ,i6by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 .ok+y lq vmlms gx/76*V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of kv.+l7y 6 gm*xms/qoltotal 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 curf 3xidcmgp t69e7mdh1+ 1 .yeprent 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 percentage power lost in the transmission line if the voltage is not s9meypi .16hxd7feg13t d +p mctepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has k .0rzl(acm7f a total resistance of 0.60 W. A generator produces 100 V at ka7r.0lzf mc(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 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 m-il+agzc(lb7s yx;450 km long has a total resistance of 0.60 W. A generator prod+blilymazgc ; -4sx7 (uces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be7jqgj *)+3l.b k x5fodt iu78st8h fbp lost if the power were transmitted at3ou ftskit8jx)l7 8b bh gp*d7qf+.j 5 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at tucph./-6c;i3 xn+,l 29wbyyssculf20 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 powerwy6 ns+utc2cl s3bl/h9 pui-x;,.cfy loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a c lv.1 ;f +,jm;wfihr4g+w(awk7ous xgurrent of 5.0 A. How much energy is stored in the coil's magnetic f+m1 g+(xki,wv f jlaw.47gw;f o;u hrsield?

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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 -.qb+g)eht2p8iepyehh1ox zw)6q* k k/4ms a 6.0-W resistor and an 18-H inductor. What is this circuit's time co 8)g6bp42)e*kpazkexq.oywhei 1sq m / hth+ -nstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage isvij.* n-apum0 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 peakga)x ww4g- r;x 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 16 gu xnpsm085i20-V AC outlet. What is the resistance of the lampi56sg un8px 0m?

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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. What is the peak curr wt kj2/vnb:/rent through th: b2w/ rj/nvtke 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 powjg3bipqb4 :d ;er supply. What is the power dissipated in t; 3 pig4:jdbqbhe 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) a 1wu1tkn:ll 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 resist7qu6m stil* b4or 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 agy i9xvrhd*y :dc;,pgz d1f76 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-iq8/ b4*:0jwaqpr1dia y t+cb 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 -g/gbeg,ad f/(y /g ze2.50-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 reactzuh(w+c di .8ppw/q k4ance?

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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 reac, 75yrjy y,htwggi 4e*tance 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 o,oxd298clywk 7,jg euf 20 kHz is applied t ,c,lux92k8gwde jy 7oo 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, 60.4y0k l dljw-u;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 ofn*:ykg q(r3gr,y o3 rs a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capad2 kycdvx+l 1ln11 rg7citive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reac.voku0b6j4xl tance 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 reactance of a 0.010-m3cstj( na;f .gF capacitor be 100 W?cn3(agt.; j sf

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?2e8h6doqhb, zz(1v zat+ xag(

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance,.1o;tkia z nz3 15.0 W inductive reactance, and 10.0nzz aok3t .i1; 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 ime( w,tguk.u)j pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected inj tuwu)g(k.e , 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 sov 8/-2lrmtpcoil, and 1.0-mF cap-2tvlmrs po/8 acitor 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 inq:w1hp:gbg1hms 6m3 qs,w3 s h series with a 20-mH inductor, what is the imp:sbh 1ws63mhqmp s3hg:1qwg, 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 conzznz f6 8tuy l*(6f1qznected in series with a 20-mH inductor, what is the phase angle at 1000 Hzzu n* fyz6lz1 f8zt6q(?

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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 j*-q:fyawy49j+ ,d ntxsj. k da series circuit with a 20-mH coil and 1.0-mF capacitor for a total a:,d9yjntj wyk sdf *4+x j-.qimpedance 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 s9-eg (ww xz :qn8/yeqeeries with a 100-W resistor and 1 q w9 z/x-y(eeqge:nw85-mH coil 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 with a 450-mH induo 1,btho7 6o(uqbbz(i ho:oh h .:nc3sctor at 5000 Hz for a total impedh oc o7(,h h:ih(b qo.so63tb1:unb zoance 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 witm d*o5y4rquv: h a 100-kW resistor at 1.0-MHz for a total impedance ofdov45yqm r:*u 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 t7:clc 9fd3(nib (;e3mvribrche impedance at 1000i3bbc3nd(7mlvc f ec9: (rir; 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 cad( -*bx1wenqt5xf85qvvs ck 8pacitor at 1.0 kHz for a total impedance of 1fvkv 5n qs58ewq8x *txb(-dc45 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 at 1.0 kHz forna4h4umt s-g7ezn )lg/ e y9j- a phase angle of h-e4s /ng l97a e-zu ynjtm4g)$40^{\circ}$?

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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 resistorop7u.ybpot283ke mm . at 1.0 kHz for a total impe.omupp 2 38byt m.7eokdance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 H)18x e juxi9doz. What is the phase angljex i81duo)9 xe?

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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+ :7 rcukbqpaa1 --fsbopnl5., 20-mH coil, and 1.0-mF capacit flcobnb- 7as.a1qukr5p-+:por are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consisg (:mjbw p fm; uqzh)9p *9n)wk.7pozfts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currenhqfw.mjzmu;b)p79:9n fp(zp* o kw) g t 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 3*y(qs:dmef4 f f/oa4vy5 c1vr u.5yql0 W, and an inductor of inductive reactance 30 W are connected ims(5rvye/ dya *u4 1v yc4ofl5ff: q.qn series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series-m bznpgvg .u58b8bsgw- :/2lx qwf4 q RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when82:w8bw/b -nlg.fgxq-5 qvpg4bu zm s 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 necessy.th.gk272e 23:dj8fjfn e bjjr txh4ary in series with a 500-W resistor for a phase angle oje2fkr jd f:.4yh22eh3bx8.tj j 7tgnf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At w 8q 6yy(z8woq-et m/(lsj:woshat frequency should th(tz sy/ qsyjlom8(q ow: 68e-we circuit 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 p 1wdr7 yjp322) jjhdv c0,saban ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connect b hpwy r,37d2)vjpdjscaj1 02ed 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 circuz6y.d-t-h n0yks h l3uit 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 6q;0*uf-x) c+yb7nnd/xlyv54e-trc c8j qad x0 W and a resistance of 30 W. What is the power fact0lfr8tdxqj-ny7 /qx;5c bav) ucd4e c *nx+y-or?

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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 contc) zas 1co/z4taining a 50-W resistor, a 10-mF capaczs 4c 1/otca)zitor, 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 capacitor and a 3dz l(qzz r/gn;k)n )hlx.uh93y5rxb 15-mH coil in series?h )35(y9r) xb zqn3hulz/drnk;zgl .x

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neededhakbk;c4+c ,e,-/ o ifi*r:imqdqr .f in series with a 4.7-mF capacitor for a resonant frequency of 10 kHz?kqcdfa/,ri.qk m*;-+ re bcif,hi4o:

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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 3.7z hv3ki-o,w/vjsg,j7-mH inductor for a resonant frequency of 1ivv,wk z /7s j-g,hjo3000 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 (.9klv u 5,e/euuw6 gjuq1jrh 40-mH coil if tuerjg6v q1uwj e .9/u5(k,lhu he resonant frequency of the circuit is to be 1000 Hz?

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