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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic kq:kqt: 9; b3y to,qmom zg+m1flux 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 b4 qyl ae0*v; )/dbfoustates 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 producesjt454 66ug xtidy a4mzeb 5cgt x*l-z* what kind of change on the induced t- z565 4gietmbtz a6dgclx*j*4ux4 y$emf$, 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 tnz k;yr*8 ;vnehrough a loop of wire produces what kin8ey;;rk vznn*d of 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 ig+c1phtonskyu ojam /kqm1 +4 n0(5( produces what kind of change on the induc1 c 5m/m(1khny(sao qio+ g4k0pt +nujed $emf$, 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 magnpn( gm):8d9ifr c9g qcetic 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, the53h 2s r9(o2qrpk4i wq 4sidkl direction of an induced current in a conductor will be that which tends to hqso4 2is3r( qkw5 4irdp29klproduce 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 horizo8n j azmote1tsrf//5 4ntal table. A bar magnet is held above its center with its north pole pointing down. The stationary mag5 mns18f /ert4jaozt /net 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 horizontaltpi(rk,v8qud m z0:) l table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vieq, vmd:(p0utri8) zlkwed 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 field vectoho51hr.x, ul.np(+ *veff.od r yw:yrr points straight up. The magnetic field vanishes suddenly r vhhwnfx.r.: e.y 1(*lr5pd+uo o,yf. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table8 bges 5p4yt5a uptna*zb 3(;a top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction 55;4 3tb pg*nayaa8tep (uz sbof 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 ,89du9o se szza region where the magnetic field points straight down. The magnetic field disappears suddenly. Whene8o u99 ssz,dz viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-in y /3u v44ere8z).c ffjjkyh*ucreasing current northward.f u.)yz e fk4re84jyvju*hc/3 Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nort d-bfzk) 5j.ls( lv3 clw-wa3yev+/rvh pole entering first. As the north pole enters the wire, the induced current wiv- vs(r.e bzd/3 kav fcy5l+wl-w3lj) ll 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 rot;ly8)gfkaac gho7dz1:8(bt wp/x 2gkated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must x8k pcg/y kbf 8ogw1hdz:);atg(la 72 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 constant angtt (lh9,:kcux)zuh 7 tular 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 h uk(7h,l9tuxcttz:) 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.( k ffgy.hg1(a:ywn; d
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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 thati 4lax2b4, 06fmbtpwh 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 fielm-n z2vg-eyt/) f cst6d. 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 dio0 i1 hm9dim;crection) is moved northward at constant velocity through a magnetic ; mcmiido9h10field 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 9q qa2 f+0ntjt.9a up /pylqlj0 65siwconstant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tf cf9h uc1noe8qb:c ,.ransforms

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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 secoggq0uu:;q5 qg 0htd;-mm y. m /ja)tvrnd. The frequency of th )am-ghgrdq;mm /g tuq.:;ty0vj0 q5ue $emf$ 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 ds*g ph(jd9 p;-ea1g z( ofjl2b gqy6t7evice 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 that7dka4zk)tb -s

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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 l2qtd x/xa7. h ompb 1zk8ph8i/oops than the primary coil thenhbo1 x.d8zx 7q i/kpp /8hta2m it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains0 mzi )k3cn-gh9(osyyh7rw6n 3nj :jh more loops than the secondary coil then it i:3k( )jo srzh3n 9mywn06-gichn7h yjs 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 powe/* 8fs9jcyjn gvs* *.jt3eudvr 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 resonantv3m qt clov(d(b4,db zn+*hi3 circuit,

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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 t5tl2 pry+w:zm :u7mzto an ideal battery of constant terminal voltage. At the moment contact is made with the bm :ztlypr5+zmtw2: 7 uattery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of 65bxaib 0;4pcvpp p7aconstant terminal voltage. At the moment contact is made wit ;pvxbippaa57bp6c 40h the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an :k(9vvsfhqp 2 e.o xm0$emf$. 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 resistanco:ai9i kp50nq0v) bs7xb2e l poqt(l2f;c2 jce 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 battery. ffjovf m:p;+em r 0h :lk: n9uz9fpr4*The time constant for the circuit represents the time required for the current to ; l4f p*urpmzkffo: +evm::n 09j9r hfreach

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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 tow2c eabz6-:p ql+5c ce a battery. The battery is suddenly removed from the circuit. The time constan6l eaczeq cp b+:c2w5-t 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 the4 p4uwa5qz6 bh 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 supp jiu nt-g98 xg8ir4nroejm;9-ly. 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 cn)i,sm6x q9nyonnected to an AC power supply. In this circuit, the current qy)n nmixs6,9

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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 cir(wefdze+v +7w rs4k,scq. )rfyec5 i(cuit changes by what factor when the frequency is +r 7 frwdwciy. fke(+e,cs(z5ev4 q)stripled?

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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 doubled, th c6fp +2m(q 0sl,3ye8;;gix 4ynn4lf lmxw dcqe inductive ; xp,fmnw slg8i6 yccql+y;3ml x(4d q fn0e42reactance 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 approacboq7gvn m*7./ g:tqvvm2 yir3 hes zero, the inductive reactance of that q3 /mvrg oiy.n* q :b2vgm7v7tcoil

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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-os+d cee fbxt*6x-e; i)z; cf this circuit, the currenf f do*e;-es+x-icx;t6zbe )c t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frs-. e+sjrw;m n cjoy2:equency is tripled?njc.- e:sr sy2j w;mo+

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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 A no:y 8nh6u1jjC voltage across a capacitor approaches zero, the capacitive reactance of 6juj18 nno: hythat 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.*-aa/e luodv between the voltages of the inductor and capacitor in a RLC series circuu*a lve/-.do ait?

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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 dkg. p101p p-wj9pmz ocefined 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 impedam zbarq (4y2m-nce of the circuit increases if R increases. W2ab (mzmq-r4y hen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of 4 pdge q6v1-bbthe 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 impedance of the circuit increasc:zf6h9h le1m es 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 bo2)vihrupp5 *yuw u 3cr1bl9,fth double in an LRC series circuit, the resonant frequency of thau)yluvwru9cpi 1rh2b*,p f53 t 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 the t lz 8zgnem8)d5ds/,+qc +hzat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whg/n vo,ph:joqwj 38-ken

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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 radiue.fumkah1ew3anz; 83 s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magen k .az1hfmwu e;38a3netic 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 unirj5j3nyf7c ozf8u2 +p, sx,z xform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnezj,pzus +xc35jf frnx ,87yo2 tic 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 0.1sd 2z69sls7 nm0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t9l2s s sdn6zm7he 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 l g*1a 5hwrus2 n2aa.sof an adjustable 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 changes0x,hgo d e2q32ejr*0b3l r hid from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squ8y,-l ctew:v oare frame with 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 in 8.0 s, find the average value of the iw,-:lt 8yeovcnduced $emf$.

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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 aaj 8 ,emnph07otajv 50hho,9 +vw .vtfrea 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 an 6veq,a4r6d,u 9k sdltd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wingwp5 j r8eq62lk2ggz4s x7o c.h span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fik7qpjgo 84x cw6 5sgr.l e22hzeld 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 3; j ,+y .l dsqxsnr2gp/m(kq,dn jx4xis 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about ax jspn. yq4k xrd/;3sl(m,j2,gxq nd+ vertical 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 h*u+q7 n:hj (9cx0rennynk5 fras 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 k+w/xa onraj m t1zoyjjxe9)26 +2gj.of 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 rectangular loops on its armature. Each loop isjpv3 i8 ipgx o6p8p9k7 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 axxpiv kpg97p6p io83j8 is 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 mx6vnb 886 vnnls-ly p9r 1 cut9/dcc6of 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 generator wit rj ;1*.mtntneh an output of 12 V maximum when rotated at 60 Hz. A magnem nte.1trj*n;tic 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 maximr e7b zq 4 cn+0bpf,.cq(3wklwum $emf$ 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. The motor operates cxis 680) dujnon $120 \; V$ 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 ogh* pshol) yqbf4-ctf)+uq ; 3f 6.00 W. The motor operates on 120 V AC, and when running at)q4 u)*g;ocfpl-tbf y+hqh3 s full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. l bp0wih 1:xv 2xb+p-o/8xwan.stll /The operating current is 1.18:/woh+a 2nppwb bv isxlx0l x/-tl.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 sua)b0j8r- cvljkh z) 4y/i0abupply. The operating b)u0i vblr)48-h aajzkc0/yj current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connec3 o0jg 9n1wqh c0 sdjokil8:-vted to a 24-V power supply. The operating currento nijdqlg90-8 c owh0v:j13sk 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 reduce a primary voltakt6,bhdj6)bx w6so o6w4 *hafge 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 7nedn p:.y (mqcauses 14 A to flow in the secondar(n: y np.dmqe7y. 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 primary if the 20 s xp-gzbmuj2g iro+;b)s;517 s imdd4-V seco05i i2;7g+) -udxb ;spob1jsmsd zgr mndary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary coil ,cfdk;gge ny37d49ml. If the current in the secondary is 3.0 A, what is the current in the prim9e,fg7m d 3dcgyn;k4lary?

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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. A:aj,uv bf5h qfk6u+ :;vyb p9yssuming 100% efficiency, how many amps at 24 V can flow in the sefu vb k,;vj:q ypaby:+hu f956condary?

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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 siggj./e ew.rli) fo3k+ mn transformer provides 7500 V at 10.0 mA. The primary coil ope+r e )wfek.j.o/im 3lgrates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its tzmx: 5z;v fz)primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in thzxz ; f)z5:tmve 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 (bd3dx5mlm78 ewi j9m9 7welb300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primar7l9b (93weel78jxm m b imw5ddy, 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 2ichz ; aw qgkjb8arjl*-*;j+turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect-l2kjr ;zajwcj*aq;+gi 8h *b 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 secondary has 200 turns. I-uumeojn4 ( 0jf the inpu (meonju0j-4 ut 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 hasgziziud3j 6)6mx4 0fh 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output ofidz jiguf0)4h3m6 6zx 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. The voltage is usually stepped imt6 m*w;a82wj kwa;aup to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary mt;awjm k*iw aw 268;ahas 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is u6l .yekmyyg64apw (v :5h mpp)sually stepped up to 4500 V by a transformer and transmitted through a power line (weyphlv6py4pma5 mky .)6g: 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+b4on lo-0)x x 0yidre current 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 percentaon +0xbie-0xl4d r)yoge 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/ o4)sinc0dfo4 5 eimc has a total resistance of 0.60 W. A generator produces 100 V/0iinc4e 5c)4fs mo do 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 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 res g0h,k)acw -heistance of 0.60 W. A generator produces 100 V at 70 A. In order c -,ghw)hk0ae 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 foz0vc ay*6.hat 1000 V. How much less power would be lof*v oa hyz.06cst if the power were transmitted at 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 20 A. It is to be transmi2*tgs8 mki7xt7/l o+vxtx2 omtted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if ttx7t7l2o*im 2vosx g /t8k xm+he 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 current of 5.0 A. How much energy is w katd -+2qfseu1bk2b-fd+ak w;a 7m:stored in the coilwa ;22qbes-k7fu k-d: a+1wbkt +d fma's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor ancz -e;;k jcys; ac;jn*d an 18-H inductor. What is this cicj-yjacn ;*ez; c;sk;rcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC cpp34kq3 hhrkf+j/k5 yircuit 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 otoa gc94rj, z)utlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What i1wgclyb)p+, 6 w+he wfs the resistance of the lamp?c w+pelfw6)g1+by,w h

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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 6y+ zgoprpe-cgf *0)ncurrenc+y-efnrg p*60o p g)zt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connectelbafyw 7b:1ez*,am7jp m.5 i:.nkishc)ys(dd to a 120-V ac power supply. What is the power dissipated in the rs:ilw. yc:bek s,7yp*ambdi.17) nf azj( m h5esistor?

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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 is onsunxd0 e822sc; p i2dc00lv $I = 0.80 \sin (240 t)$. 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-Woni 9;woy21cp8c sn, w resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-,mbr3z*m8 ldqh d/as7ph6 9.ljkv6kfW resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzt4//d7d 0ewklczims a.4 kv +v?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductiv5c e0wsokzs5rcg 1qujhk76py0j,:x8 e reactance 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 c-kwiwzr:u x l(x 3j7t*oil 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 fexb-xp kj x0l+c/. 2ox 85osdtor 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 freq( rq2(xqvn 1 0naf9iunuency of 20 kHz isf vq(9i2n10qnra(un x applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source?cb nn3zl: t5v3

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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 reac:xcb3z3xrt3)wo ;peutance of 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 capacitivuam()b9vz m v(e 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 reactance of 1200 Wk 5d,*/a9rzoolq j,vjz dx5 ,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 capac*bexfi :h. 4w0oua*q0dl; 7an gvp:sbitor be 100 W?. pbaieaubs*dw h0gq ;xo:nvl*: 4f07

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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 Htqn zpqipbp1(g ;s8 ).z 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 9cvq 7di.j9l) em:c cmo rc9x2with 12.0 W resistance, 15.0 W inductim)r :x9 c2jm7cdq9icc9eo v.lve reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mHvw0:0m gggf9 +0e1nbuuxgfe6 coil, and 1.0-mF capa10fgeugmb u0:f xe 09vwgg6 n+citor 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, 20i;lt3 gp9 /htm-mH coil, and 1.0-mF capacitor are connecte;3 i/tmh tgl9pd in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, .+bv11gt(pd uiwm 7yewhat is the impedance v.(u +1wde1tigpbm y7at 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 conn7zr uh00srh. oouvd+,8bk50/j kl ryy,k -sl dected in series with a 20-mH inductor, what is the phase angle at 1000 v0ou ry+sk/j5 s.hlh 8ky- 70uzr,okrbd l,0dHz?

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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 se *rw,+ti*ao-ok1ov m xries circuit with a 20-mH coil and 1.0-mF capacitor forxorvma*to k - w,i*1+o a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in bjj- xb nqq+1m 57cx/fseries with a 100-W resistor and 15-mH jmxc+fn jb1 /7-bxq5qcoil 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 4o y7 1twhczzak0dga3:3b e3k450-mH inductor at 5000 Hz for a total i a1 :0g3e7k4d zh 3ywtz3acbokmpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with ad7 0dyan6drp 9bsdh9; 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?bda9rs0d p;6h79ydd n

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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 cao mx c-u0z7 kkb:l(.b.lom)mg7yzdk 8pacitor. What is the impedance at 1000 Hz7zu .ybb dglkc-m xk :.o km(l7m0z)o8?

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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 seri) rdhr;ab;glbd5dbabo*9y:)gcez 8, es with a 10-mF capacitor at 1.0 kHz for a total impbe9h:b,5)yc r) g gldzor ;a8b a*b;ddedance 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 ca kr)afs.rs- 1e (ie9d/z 0tvfhpacitor at 1.0 kHz for a phase angle of 0ef19r-dt(.sa iz)she vf/kr$40^{\circ}$?

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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 resistor at 1.0 kHz for aw 0antn8r3y( is 74qxv total impedance of 45nsry0vtqai8(w x n734 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 sermaru5ss 18u)ryn 5 wb5ies with a 100-mF capacitor at 120 Hz. What is the phase anrm55 bu)w syna58 ur1sgle?

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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,m5kw e8dzn 1-hr i9t;0 r)tgwd and 1.0-mF capacitor are connected in serie ;d108krntegrmhwtwid )5 -z9s?

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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 caiiy 6d3ypw quvt voxcz6;8-z-a+y (3mpacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is--yixtpvwyc 6au vozq(z miy3; 86+ d3 the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductor .u k3boyzf)x.of inductive reactance 3)b.y.3 zf uxko0 W are connected in 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 ;3ezb:vbg6f)zs:rg s djn efm7y /33 .s4kmbe RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to 7de63m)3s r; 3yev.: /nbbg4bfjg :skzf mszea 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 sme.1bg 4o m*/ h;/orkqd-xp woeries with a 500-W resistor for a phase angle ofem;xd p/1 ok4 gbhwm oo./rq-* $40^{\circ}$ 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 =yzvm)*m.lcwm/br/u 9 qy j) 1j7y zc:h 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have j)c l hv*.u/zmjyzy)y9:b /m rqmc17wmaximum 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 wp; k.8s4etqkwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conneep st.w 4k8q;kcted 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 5s5n.13it )) fz 802swtd kzmyc+7pcod bf bqmcircuit 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 resistance of 30 W. i + s; po7xayk4vyv,j 4,kqgf*What is the pow,p4 + yiqxa4v o*;kjg7vy,ksf er factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containinll (o 6k*asuj40u6vh ng a 50-W resistor, a 10-mF capa06 lh(uu46nlsjv o ak*citor, 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 15-mH coil in serq., ivw 5ag gx.fgvl)6ies?qg5a l.)gwg, x6v.i fv

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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 capacbbc qgp,l-e;e1g,/y9 iznx6 ritor for a resonant frequency ogg iyz e/,6cx9 pl,bn-;1berq f 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 inductb4nj.nx i. g ;d8q3;:fmjf,p chj u,rtor for a resonant frequency of 18q u m,ptndnix; cjbjj 3.h4 ,f;:f.rg000 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 resistorbjza6 e7ku2if c,psm1 vz59,o and a 40-mH coil iu5o, f, e76jak cmizs92v1pzbf the resonant frequency of the circuit is to be 1000 Hz?

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