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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of mafnul4z xkie(2,o y0z w::6onjm :f)nxgnetic 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 inde13*oymmw.nv2i k ; gxuction 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 produces whaz3(c+m2y; iax8dj qjdt kind of change on the indy d28zc3 ;aix+d(j qmjuced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a0*z6us;1 peua idt y(a loop of wire produces what kind tyze;60u* is1pa( udaof change 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 7tk hddit-g6,8w pkl (of change on the indu htl, ig6wtd8p d-7kk(ced $emf$, 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 frhd 36qne1v(fl5k / x/ 7 mo2zsdtlx4gvom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of r 9 l+ij,)0ryvcmn0 bfan induced current in a conductor will be that which tends to produce w)j0mrv rf9y0,b+ni l chich 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 flatle:h(h/s* iwab,c87 vjgy3e ;sca e9i on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromas,ea/ e3c*7s(yji8 :9gli ;c bw hhve 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 k7/l a + wvn gjx8j4.*qdmoe3wmagnet is held above its center with its north pole pointing do /7 .gmw8l4+j* q k3nvjaodxewwn, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in asnq p496c1kk urxx*s7 region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coi9 xnxk7 u614kss *crpql 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 lev,wd0a b8 5rkt d7wpmm+el table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Wh+awmb0 dk t7r58dmp w,en 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 q3nlf:dg; 9xw y/lta(a horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the indq al;9 fgl/:wxd(nt3y uced 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 ho *h8 ,(3nloqqzdy-ysn c,h -wkrizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. (cz8l *h qsky-h yo n,w,q-3dnWhen 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 n(3shcflv2w r 7t9l7iwire with the north pole entering first. As the north pole enters the wire, the induced current frh i3n lw2s7tvc (9l7will 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 q.:l81p8new8 yj1 eof8vaghv -;-a(r a yhsigat constant 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 orw(af1ho.s8qh1- 8y - gp reayile 8anvv8:;jgientation 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 rot3hyjcv8fzh 8; ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dhvy8jh cf;3 z8own, 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.rpmi u ibq 84 k8m:j3jy7qo :ht*c8omct:l 9p,
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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 od-9y 3bt:h 3rymg/ivan $emf$ 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 n(( 09- c)a tmb+vdconyuhd-z. 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) is moved northward at con;n,vlv ) d+* 0hplixwtstant velocity t,lt)0 +xvidhw*l; p vnhrough 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 angular vm*9alk v ul34gmlbxpi6n3 t/ 6elocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans( p odw35 0xctlzsd l(f)nhtkz/e,1w .forms

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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. Thdutn2.pkv k32u96 ut ue frequency of the.v62dk93 tnu u2puu tk $emf$ 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 93sjnwxt 9ty: 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 device5w+ qcja2ym,fic;3 lk that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the )mg;pbf.pv.q/ppx y*) tdz 6y secondary coil contains more loops than the primary coil then it iby.dyv*p/fmp px6) pqz ; t)g.s a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the sec,en yt(fo+w boah:z:x:*9ilcondary coil thel ,iozch:tb+fe*a:(w9xy :no n 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 powery1bgb nyh98m5lw5*l w +iknp/phe )y6 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 circuvsctc9 su ;*m-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 connwa3 m11p 5ilysected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro35pa1sym 1 ilwss 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 bacntm;c(+::m-hnzl:i .kn9s 3wfm an cttery of constant terminal voltage. At the moh :(cma;ncn fn:l9 nm.3t:iw -ck+mszment 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 awu8xbql/ p h(:nd 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 inductance L and resistance R is cobfb j:7fj8de8 nnected 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 battery. yekr+e 3 ae:1r/4 wipf The time constant for the circuit represents the time required for the curra3ref rpiew/:e4+ y1kent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to44tn6yu mbbz+ a battery. The battery is suddenly removed from the circuit. m46by+ nb4utz The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have th t5fu/kbhbn x4c5tcnrm/+ss gc66n1 +e 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 supply. On this circuit, the current oxxnlozk, 9 *jn.ja86

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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 circuit, thvy: j p3ipro7qqzn. 21e currentn 1q2zpopjq: i7vy3.r

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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 whatm*kped+ q:b) a)y +jebkn n58.o;grqw factor when the frequency ;ebjdmr8k++. * ) geyqpqan )ow: 5nkbis 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 i*yzza -q77.n. x+e8w3 xvpmpcdf-voyay(hr)s doubled, the inductive reactance 7aza ocdz8q-px.e3 7*)vnx+ prvyy-mw f.y(h of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the i6. j+xv- iuztdy,lfq(nductive reactancizu .6vql,+ -f dxyjt(e 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 /x)lx *(kcu wledww. 3circuit, the currexww/c l(kdx .ul w*3)ent

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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 factocn1b.-rrllu *r when the frequency is rb-un*.1 clrltripled?

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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 adjijyvdao,d) +8l ).tcross a capacitor approaches zero, the capacitive reactance of that capa ) didvjyd,) .lot8+jacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor inefr j, 5 hm2o)hu r*ejp*fofk2bc46skiz 4.g7 a RLC series gh4,.p5mj rjfi*)o c26*z u2 7b efh4keskorf circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defi4amu)m.uhg)/ olbmo+a : 8owfned 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 imped c2l:5wbay xoovi32a ,ance of the circuit increases if R increases. When is this statement x2lab, y:w3a2 5oicovtrue?

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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 impenat/.7yt m 4gcdance 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 im8qq *- pvmek4 wb c7,ov-ux0hupedance 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 a sgk55t 9aom3kjk(d*cn LRC series circuit, the resonant frequency of thatckk5 mk a(j9s*gt3o5 d 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 appliu0q 54 yty/kbe90l vhjed 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 whf eo ;rvrsre72 :so)(yen

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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 apw8c *eklis;9g 6li4z uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo4e ki8z l*glws 6;cpi9p 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 i+aogjfa4 0:vm s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh4ag:fj vmo0+aen 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 rotati(1a jey c svk)b+9k;ijng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle;jk y j1)ibe9+avsc(k 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 loopah6.4g; q 6)gyto jkaoq+zk17pqxsyad -/ -de 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 frobprm0rx4 n7w 3;3hp ytz8m 8vxm $4.0 \times 10^{-5} \; Wb$ 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 witiazs , :ggl15xh sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 sgz5ia1 gx l,: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 and an area of hc)htm0hx 5ebl7 /,vp$0.40 \; m^{2}$ 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 ;+7u mru jc2k,tvh *rfarea $0.20 \; m^{2}$ 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 jl*7kh9)(zdqggsx x,s4exbk* yva3dj 31 ez860 m flies horizontally at a location where the downward col4dv,3gb8 d)jxhx(*kzja3q* g s7xzeeysk19mponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that isb0 n1q )0kdcqgy p,g)e 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a verticaly0kb)1q n)q dg,ecp0g axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional anr7l(icx p yy+25fmarz8u k;( rea of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ohq) l23u3hwlkumt1vhn p6g: )f area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its arma9ebnci74)pdnni n/5kture. Each loop is 12 cm long and 8 cm wide. The aiin 4nn7dp )cbke9n 5/rmature 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 of wire o0xs6k)tu o.s73f r)b3jj8zeol xn s2 zf 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 generator with an ou97gyacddz4 e *tput of 12 V maximum when c d7y *egd9za4rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximumd)a 1huye :wgz h8:2zqgo 0p;m $emf$ 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 mii1m iexsa+a -tz8e9yy q; h;1otor 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 havk uz4brg n;7q*iuh,c*e a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it genera ,7b*4k uqhr *;guiczntes a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected 4)nepah64rw,f:d dy pto a 24-V power supply. The operating current is 1.0 A. 4 py 6n pade,hrd:)4wf 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 supply.*xsux7efg m,3 The operating current is 1.0 A at full speed. What is the3 7mxe,x* fsgu back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppaw.a5gca80yljygj;/twqd 2 doto . :+ly. The operating current is 1.0 A at full speed. What is the bqj8 ;y 5c+.tdoaa2y/:d ljg wtg 0aw.oack $emf$ 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 need -u y35ekh;2d zifel)t5mk7mj ed 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 a2gin g/:ea k0hmc w8g: transformer causes 14 A to flow in the second g2n8aigh:mg e c:k0/wary. 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 turns are necessary in a 110-V primarq6mvtxei 4n- 7 *itiv+y if the 24-V secondary has 100 turnie v-v*x+nmtqt7i i 46s?

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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 anvoomd1l y)t*g*wz fkd8-0y8ad a 2000-turn secondary coil. I*tk mzyog-vow*80dady )18lff the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumirc-da)ojj qmfod+./dq. / ve0ng 100% efficiency, how many amps at f)ocej0oa.j/dd-/ + vdm r.q q24 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 prov y5l (.dfjcse2nnk,e8 l l9sg7ides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does 85j(y kfs. 97 ,2lgesel nnldcthe 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 awqw1han.wvu ) *l(v.mb abjfz+0 z;9x nd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in thf zuvwaxwl 9 jvn ) zb(qa.1+;.hw0mb*e 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 its se hh:66yq xik+e.cf /afcondary coil. If 120 V at 2.0 A is applied to the primarf f.x yh ieh6q+:/kc6ay, 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 turn7xo nvp-ph-d 2g.c7kv;0djh b((dzg us and its secondary has 200 turns. If the ind0 .kpco(xz-dvjh7(v h7up2;bn gd-gput current at the primary is 100 A, 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 turns and its seconduixq 2n2 w(be.ary has 200 turns. If i bq.xnew2u 2(the 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 transy-p g8,4ns tzoformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can esgz8o, 4y-tp nxpect 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 12o0.sx(ommqwx..k y3a,u q0xpjhl ;) o 0 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 ioq(j.sa).o wx0,u 3. o ;xkmyxlq mh0pn 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 currenfgo40 xf+kamxt6t ) +bt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmif4ft k++otx06xmab)gtted 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 at 120 V. The voltage is usually stepped kk /) 2slidv0nup to 4500 V by a transformer and transmitted through a power li lkkvns/d )02ine 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 km long has a total resisy id 3*s4lg. d2evyvm :;a7xlctance 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 wi y7 avmy*:s ge.32lddc;lv i4xth 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 0.60 zb4m v+d bz,1rx+63qajgr8bb W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of ther4 16zmaxbqbj+vdb +b83, r zg 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 9 qd4q ji5:)dh/g tuic1000 V. How much less power would be lost if the power were transmitted at 3000 V d:9dq)tihcg 4jiq 5u/ 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 440hsnao( kfn60j6c)h4 2 i.mwzq V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must th kqjnc)0h( 64 szw26a hifmno.e generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a cue86dck;k: eg errent of 5.0 A. How much energy is stored in the coil's e;k8kc e deg:6magnetic 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 inductoe)77 ;+gdbv gg 7h,t,sqizp. aou k2fbr. What is this circuit's timde2,ugp,f7to bkg zs.hbq v; ga)77+ie constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC cis8 w/ dq,sip+lrcuit 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 current h inzp0 :lt4t kymugl/;a);s4?

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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 1q)ja zd2zak 5t: : je aj2hech/3,(bnp20-V AC outlet. What is the resistance of the lamp:a ap)ejz n/ kqe2:,hbzt2a (3jd cjh5?

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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 p1q 2r 2bkfeq9mower supply. What is the peak current through tm1q be 92rf2kqhe 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. xatg: jynj.(1 What is the power dissipated in the resi1y:j ntj.a(g xstor?

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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 r md15xiq/wk- ,gw-l gvesistor 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 resistj j7e*vs8okn:or 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 resistor is tbj/2w3 g6mp ssai,:d$I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH k* ;c3dph cgp)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 coicf, xb-sh:*yo 9mawu, l 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 com qr .vef3w ee )kxy4l-cx9iod: 6;af.il have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary fo43llgkd appp:b a /aon.* +9ubr 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 V AC at a frequency of 20 kHz *yr qfg+kg91gi 8sg i4p6)muqis applied q9 +ipr)ggug48*i fk1myq6g sto 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 1c .tgii6e srj03* djdk6 1vdx110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 104b4p+)cyq.g qxom24 9ju(2 biiwaq8vhu. fzr 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 .+siu/s9ruhgmt5 rn/ 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 ha6k-s oce eut +w:wdo2,ve 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 willu, zy42wc1 krd)un ib0 the capacitive reactance of a 0.010-mF capacitor be 100 Wbd nzry,1 c04uwiuk2 )?

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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 0.0t5w+4c au armcy-mcr;1 t3.ps010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 1mt-yhn 5dyc0dp-j/4.8p chka2.0 W resistance, 15.0 W inductive reactance, and 15n.j- dtpc myd4 p0y8 ac-khh/0.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH co* uy5f-4sefommk z/, gil, and 1.0-mF capacitor are connected in seriegoeymsm /5k*fz f4- ,us?

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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, 2 ;0)nkyojmvhqyl lf38uj 0j000-mH coil, and 1.0-mF capacitor aq0jj h0l; fm8lo 0y yk)nuj0v3re 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 connecczw2 4vwvrb6;n) ggqpia* sx/a4 m9.lted in series with a 20-mH inductor, what is the impedance at 106)v.z4l ;*/ng cba xrw pw4 sqima2gv900 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 indws 7r dd0ur*k;uctor, what is the phase angle ad0 urr;*7wdsk t 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 wit.-6h/a pn; a+pyn +dslb /wefoh a 20-mH coil and 1.0-mF capacitor for a tota/+;l+fh ./s 6pepboynna-adwl impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is n n06; ; wsxkgiba 7ihbqx)l,-reeded in series with a 100-W resistor and 15-mH coil to7lsbxk-qin 6 h; g) a;xiwr,b0 get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a.n en7.cp1 pfg total impep.f1.gpnne c7dance 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 must4)vn: z6gi)e ltc5cyc1j,cxb be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 k c4)c e6:g1bnjzvci,x5t)yc lW?

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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 20xw, .rh6fn2bdn2 j *vu-mF capacitor. What is the impedance v.nd* u22, f jwrhb6nxat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor 6md)* rnrq2v (oysg3jat 1.0 kHz for a total imsd2y* 3(r gorqj)6nvmpedance 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 with a 10-mF capacitor at 1.0 kHz for a poytlb2 q +28xfhase anqtfo22y 8 +lbxgle 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 n zfmi;n 8i l+aw7.;qdgszo a+k7wt m83eeded in series with a 30-W resistor at 1.0 kHz for a total impedance olg 7 az.ad8k7io f w+nwms;q3 m+;it8zf 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 itth8ve44ng wh /p3 pw;n series with a 100-mF capacitor at 120 Hz. What is the phase angle? tvn4t8e g3/ph h;ww4p

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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 ihl9 mnmpmr(4l .qwm. +f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected irnmm. p+4 mmll .h9w(qn series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF cap;w dlphp a r4m6w4hh(s*-gp9lacitor, and a 0.350-H inductor. The circuit is connected to a 1ph4 *;6l g(-dhpw9p aswrml h420-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and p6c/lluaz s .l*p.f nt5o8m +nan inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in tpp+uc6 .ft. lzl8lam*/nnos5his circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistoz. +3fi gylc8lr, a 10-z . 3iyl+cf8lgmF 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 series with a 500-W res o;-pwpb d,k(zistor for a phase angle ofk(wd,bzo;- pp $40^{\circ}$ 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 what freva8av)s4v8ydad1z: g quency sh)y 8d4vvv1a s za:8gdaould the 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 an ac series circuit with 12.0 W res 61ma1d gio)cuistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectedam )g6 1du1oic 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 ( i,m2qq*dism 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 6/ (;zcuy 9 wp*n(arbws0 W and a resistance of 30 W. What is the power fz;* (n(pw9arub /cs ywactor?

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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 facn*a e(mw+z+m ftor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-fa+z*e mmwn+( 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 frequ2 znxr wqs .tus78e58nency of a 1.0-mF capacitor and a 15-mH coil in series?. un8zw e8q rx75ts2sn

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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-mF capacito2y: 5 keop1kkld qz6k7r for a resonant frequenk:1ey 75d2pqkz o klk6cy 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 with a 3.7-mH inductor fa22 q1buwp5y11nlsft pl/o7 wor a resonant frequency of 1000 H7sulo1wlyq1 p12 a52 pnbw/ftz?

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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 seri:zn/ 8zp sa.oqes with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit sa.n oz:p/qz8 is to be 1000 Hz?

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