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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of ma *9*mpq gwdmw9gnetic 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 inductuops *y*p; 7chp0s) twion 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 produ ;yrqcf0j /i;uces what kind of change on the inducec/j ;; yfqir0ud $emf$, 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 a loop of wire produce owi63p -0 nmg,gg xk jeb201mpai6.qrs what kind of chanjkgg6po ibni6 m ,rp a.we3q120gm -0xge 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 ag xu3/*rkis :c loop of wire produces what kind of change on the induced s x/:3gruki *c$emf$, 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 mn ybeq*1z2 (sqagnetic 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 direc8v:zmpg k 3k7teu0ud/q hd 1c0xtpi52tion of an induced current in a conductor will be that which tends to produce which of the followinip2vuk t8xkeg0: u5zhq 3pcmd710/td g effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal 5zq k v;vs)olug8e. 2stable. A bar magnet is held above its center with its north pole pointing dol5 )u2z; 8qevvssgo.kwn. 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 held c ru709 o4*lmbpti/xl above its center with its nor7*pli xur tcl/94 0mboth pole pointing down, 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 a regionc;;do *dtzft; where the magnetic field vector points straight up. ;z ;fct;odt*d The magnetic field vanishes suddenly. 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 ta8qo 2t9 nrq3dyble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fdqnto 83r9q y2rom 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 oyt; 5 d7o e.4+rptbdxthe magnetic field points straight down. The magnetic field disap+4.5dtodx trop7ybe; pears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizonta4hye4n w0hz2 hqr8 .0wyf+mf bl table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of t40+0 h2fy8q mh zw.4b rwyefhnhe wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entersgsvq cq8 yhud(u)ut jm1eb/*v **h+/: m8aeoing first. As the north pole enters the wire, the induced+*8sq )dv b18/j */ues ugmq* toc: uyhevamh( 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 con vi q2k.dqv*m5stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight d 2.mq*qdv 5vkiown, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant anq t4bm+di)a5fgular speed about an axis whose direction can be varied. In a region where a unifbd+4 iatfq m)5orm 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. .fhr4;9:zky whmybm 2
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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 thu f)k;+xz iyeeg d4u-6j2( jlmat 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. jbx)- +w:yy e;y(, xolq/iunt 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 tt1rp; k1 k0t3pzb;y.p jnq0mlhe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential i;qmk3n 01bptyz1l p rt.kp j0;nduced 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 vd 0oncurj0-b1elocity $\omega$ 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 transform mawp+ , ml8jjxcty/,2rm wbv8( wwm) iqt6s-8s

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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 60w2cfmmxt :02i :hz8oz revolutions each second. The frequency of tw : 22mzt8m:c izf0hoxhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t yz75bs75cyr zo

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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 th b*lq6+f2uumfat

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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 loops than thvfje 0zjkc3f2(; kwwqcj5 :)w e primary coil thec5j2kw3q) jfj0 :wzwvefck ;( n 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 t;42hy;27fvk hg kwnh she primary coil contains more loops than the secondary coil then it ishg;h 2nv kwh7k;sfy2 4 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 power inv-mguoghf3,hz9, 1mmput

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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 circuitact bov9 n e (p,)d,e(t,z9msd,

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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 induc- p,-xkm3yolwdr b00 ytor are connected in series to an ideal battery of constant twk, y -y-mxd030brloperminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of constlm* 63pvo 2h(pljioi7uv7j +bant terminih3u* 7 jol+i2vjol7 (6bpvpmal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance Lt6k kgfvw1d n5b2t:7z5:xtf d 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 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) 6yhyz5l90n4xkri bf 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 battery. Th5+ (ughw tyvevhqs8z+qjy,;y(a0d 8 y e time constant for the circuit represents the time required for the current to reacsevhzyya yv+;gthy05(wq u ( d ,8+q8jh

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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 to a battery. The battery ixj;()h un bducz.u:fxz,(8 evs suddenly removed from the circuit. The time constant for of the circuit represents the time re)zfd (vxchx e .z(8;unbj,:uuquired 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 the samewvqlf (w7 wzz:.-z s0,u -sxw)uy;tf k 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 i gw iv5q)(gt7*n,bpxAC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the78)h 0krrklfoy/3pdrb t 7qt * currenhk8tfb q)trl k7o/30pdy r7*r t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor wo5;3z6,n/rd gvfg 4iti x9a2gka :pe ghen the frequen6o:a3 gine,ig rxf;2 a945pkg/vtz dgcy 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 acrosyhs.1w8hh+0: jc3xu c7nrvebs an inductor is doubled, the inductive reactance of v.08w jhh+subn1cyex 73 hc:rthat 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 induca4r.d5wqn 4s k:bdqr2tivn2a d5 .rr4q:d4qks wbe 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 circuit, the c dn1s4* tcxl)turre*tsdcx l4t)n1 nt

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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 circuitcig),9 ve;szjp o1p0 y changes by what factor when the frequencypjov;9psz 1 y),ge ci0 is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the hq1* s5 / ghmre(hj)1iw gdu.iAC voltage across a capacitor approaches zero, the capacitive react m)iu *swh(gh gq.1djrh51ei/ance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induc+o 97l 3x*at tb09 (sxkvxvcyyplqj8;tor and capacitor in a RLC seriblko+8*v ty qx(9axc ;9 3xy0pvls 7jtes 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 ann-612cv zyoee RLC circuit 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 imprw *vhbl *-6eoedance of the circuit increases if R increases. When is this statement t* e*rh -v6bolwrue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases .peua m 308g m,bx7gvuif $X_L$ 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. Tr/hawp h);(oxxq5g pb,z, /k dg e**irhe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance anr pc6er3t-ibk/s d(/dd the capacitance both double in an LRC series circuit, the resonant frequency of that circuit wil /p e6rik(dstcr3/ b-dl

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltao/8kgq ptq2+e- .9 t wg5hybwfge. 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 oc*wz4pi 1r g2zdcurs 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 rotating in a unifo rk0fwc ;uzw-)u+e2dxrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar2+cz)udrw x- k0 wufe;e 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 dm i)6eyik9s2uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mad6)2eiim ysk 9gnetic 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 rotatilcz 0 i.wv-u(ang in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn (lauw. vic-z0etic 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 adjust/ oo,i v8nt-v1 tut1aej*7utv able single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fromlj6yn a2n9k,z u;vy t9 $4.0 \times 10^{-5} \; Wb$ 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 2 u(gt+r7uaqq+ 00 turns 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 changesa 7ugq+(q tu+r uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area y+y:ega/k rnhhadrou52f 8,2 4pbtm) 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 gm* u77ofs-etya 9wf5 (u ;mivp- y;ujarea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a loc gg7/whyj/5m oation where the downward component of the Earth's magnetic f7 wh gy//5jomgield is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m *d wm 8o7j9/knhow)cslong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while idno 8/m*shkj7 ow) 9cwn 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 ce cffv *+cl.p9ross-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 consistsdfpqnbbp za509t-cl e22 1+v x 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 b :6 r 0+6()sy wk:kt-uk+enloov dhmois 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 fielro +o)b m6hk +yld-sn(k:kvoe6 wu:0t d 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 of a+tfup hnd0h8 yy3)bn.rea $0.090 \; m^{2}$ 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 gen(iv fe93q ql2o*.zfdxerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T i93ie(zdo. flfxq v2*qs 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 . 8 qqqq6m5za 39ms7s m wzkzy0mo+/wzmaximum $emf$ 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. Thdv 6t8ah mol, mfr2;e)e 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 motoyfrcm 7;r9:x8 bvf 0mhr have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a baf7 rry9vm:bfx8m0h c;ck $emf$ 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 o 42p7vbchq n4*hfr,pconnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up rvbpqo44 7c,nh *fh2p 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. p6bgrq.dd:nhpwj; 4 cz 3u2k:h 0 2hqqThe operating current irn;j2cqp6hd2h.g:z4w h q0ku3pb q d:s 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 connec,zpzjd mq)6r)( v cgo3ted to a 24-V power supply. The operating current 3rmpzjco(q),d)v6 zgis 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 red(ut6 c+7gnw nruce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer,ognn4w;qbpqz8z;s2p x +7oq causes 14 A to flow in the secondary. 7 pbqs xzno2qo;g,pq; n48zw+ 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+pw5sx u(rv usm9c(7 t primary if the 24-V secox( w (tuvmrssu97c +p5ndary 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+ax wlbi0v0 8o secondary coil. If the current in the secondary is 3.0 A, what is t0ol 0ib+xa8 wvhe 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. Assuming 10-o tjvacjv6 ;rbh72)t0% efficiency, vc t2h);rj ot7- 6ajvbhow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 1 gqv jp31 a.dvkl-ytk ;fb1)e:0.0 mA. The primary coil operates on 120 V. What does the pr3)- yleftjabg:. pkvkv11dq ;imary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tuzd w+c+ezh (a*rns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what(c+ wzh*d+ eaz 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 ngcq fvk 7av 65w80i4hturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current ikhq 7cn608ig4 vawv5fs present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. il066-a gkicv1aw(s o If the input current at the primaryliiks(ao0 6 va6-c1w g 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 secondary has r 2 -/ eqbpetf,r fmz;f;n1*lz200 turns. If the /r;q e p-,r;2fenlf1b *tfmzzinput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its second(jf vpx bn8y9i138fj oary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negl nvf 89xpyjb(i fo81j3ecting 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 i :emelksr )kf9y +uo)k.mtz )5s usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the se u l)y9zms)kk5kofm:).+ re etcondary 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 V. The voltage is usually steppii3bxa1b o7ptfm h g2*b b583jed up to 4500 V by a transi5fgb*3 ij7bpx 8oa3b21h mbtformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current aheg5swjt oh6:4w 2 oy h7tkf-is,,v*gt 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 g4s5,,jw tskf:h2 h h wi-*e6 go7otyvtransmission 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 resistance of 0.60 W. A gbh l4ecs- csa4ao1t45 enerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage isl c44 4-5t saobae1chs 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 ,ayjc -aed6/u8wj8fp 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltj- ,d/ca ja8eyf upw68age 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 tc+c,(wf eup1d1hku 9 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V ins 1+udc e,(9kwthpu1cftead 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 4d bfm5,nlh +ei cm.y hlzwv/ j:9a;35q40 V at 20 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 power loss in transmission is not to exceemcz.q59em/byl 3hdvnl a+w: ; fij 5,hd 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 stored in ge ffn fq t+6x71*omx:t3ppa1the coil's magneticqmnfp*g t3 x171a 6t:xp f+efo 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 induct9qkuq5.s (rnqai5 qfnjb -8u 9or. What is this circuit's ti-q5if89qa jn5bu9sqrq .k(nume 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 circuit where the lbmt( okuw+ )3d3+wk qrms 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 aswg 3l ;6cgdmv 36px)b;*9uj*yg gsmm 120-V AC outlet. 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 is the resistance of theoa-(:adcl .p s lamp? ad(. -ocas:pl

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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 a2 i (phefxak6--8d gpthe peak current througad 6ae 8kphif--gp( 2xh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to /m;w9l8* gayjbd87 ia2yy d*)vnzhdz a 120-V ac power supply. What is the power dissipated in thegd m*9w *2hyj z8 d)7a/a8d b;nziyyvl 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 50j3(sfp (y(p wg-W resistor 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 pzlh3e kg;2+ aa 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W i)nm0 k8gi3 idresistor 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 ryw x kq-vghpek)4 5dnb56/h+ 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 recu.(e:u k*y- d2xbqdh actance 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 hfqn 8z71uny j5)eey *tcx;w o3 p4)ar14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductivl;zu md(4)*jpmsek:l 5 vby4he 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 fk,c(y/.nrz fjrequency of 20 kHz is applic,. kj(n rfy/zed 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 duefr )h18 zi2tabj6y tr: to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitim*fnrhp- 6*b hve reactance 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 capacitive . a r10 xkp1r;fyst6syreactance 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 e02b:vc y4bynof 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 /691 vij nlvpo r8zm0vof a 0.010-mF capacitor be 100 W?09mr1jv68vlip/zv n o

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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 cap og+ +dp wi8(nptsqi/8acitor 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 12.0 W re ,rkfq-2 f;t4iwh8ptksistance, 15.0 W inductive reactancep, rfkfit wt8- qkh42;, 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 o5i 7n(u ou-0wth/c kfat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie f t0-ch(onw5uo/ i7uks?

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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 17pabnzan3 k6f 4-c2 wwx(fk7 h00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected nbkzn7w 3xpwh a -c(k7f26 a4fin 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 ;a 2wxb 1h+upy bif f;ugz(2-sconnected in series with a 20-mH inductor, what is the impedance- a1;2b (iffxgp u+hbzu2sw;y 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 iswhy5v)xuw 5/0alp-+;b6 rspp z 8lhmm connected in series with a 20-mH inductor, what is the phase angle at mlh; 8p/5v-pwpm zhr+s y lu0a)b5w 6x1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with avk4m) jy,(lch 20-mH coil and 1.0-mF capacihl ) 4vm(cy,jktor for 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 5o6xhm6e7o p(ofjg: scapacitances is needed in series with a 100-W resistor and 15-mH coil to ge5( o6p:gooh xmf67sjet 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 indu;.v byep z5m//np0gk actor at 5000 Hz for a total impedan/yp/n5bezp;akm 0gv .ce 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 serie6p;vryy(o:lgrm 4b,nsd w; c 9s with a 100-kW resistor at 1.0-MHz for a total imrg9c ; s;vd4ylnry ,6(mw :obppedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in serh6 fs 86v: tcokk)i-tsies with a 20-mF capacitor. What is the impedanceikv sfk8o)c66t hts :- at 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-mF7vn 6j6 ftp/2-3inb pih;wasr capacitor at 1.0 kHz for a total impetpbvihr62j wnfp6 s7 /-3i;a ndance 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 kH0 vq i9y a2ywoupox802b:k 6im -nfbd6z for a phase angle of by06qd2ok v0w: n8 m2iy6 i9-fpuoxab $40^{\circ}$?

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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 seriesr rh2kpxvh3: -ja,m m l5*tb1b with a 30-W resistor at 1.0 kHz for a total impedance of3k mrl-v1hh2 xab,mrpj :t 5b* 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 Hz. What is the pha reayv+.u/n zqg 4,t x4nha8.sse ang 8.gne.4r,+zxn 4u aayhqvs/tle?

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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, 2s/bbrlbr*::-j o zp e00-mH coil, and 1.0-mF capacitor are /b- zsr:e*0jl:brbo pconnected 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 consists of a 100-W resistoe0 r61ahbjh g)r, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is6b h0r1j )ghea 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 i n.:hz4iytfz hz2.+sinductor of inductive reactan4 z+ fh.nsz:y2hzii.tce 30 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 RLC circuit containing a 50-W resistokxbvl0(w dt)b s:,34x6r- qyuv 7lwfnr, a 10-mF capacitor, and a 0.4,l4 wqbybw:xn0v-lu(rvkxs d)t 6f375-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 resistor for a phase anglew lu2mefk7*eue6tu:*4i p usd+3qcd( of*ud 46 l2esumepdfq ieu(+c: w7*t3 uk $40^{\circ}$ 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 dv( q9b1xb3 pdy ,0dzm= 10.0 mF. At what frequency should the circuit be driven bzdp(13dvyx d0 9q,m bin 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 resistance, 15.0 3sq+hk txej a 6kz/aj:35m6ixW inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120ej6k3x63j as5axz k:i/ +qthm -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 c1bfhp.vuw6c 1ircuit 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 h0ty gzfu r h017gv8*nxas an impedance of 60 W and a resistance of 30 W. What is the pofgg yvu7*08nxrz t0h1wer 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 containinz/aicvk;c f8zpyh )n5r 3/l 2xg a 50-W resistor, a 10-mF xay i3;prvlk5cnfz8z / )c/h2 capacitor, 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 seriesz)xh ;(r rp jr y2dji-+rna+(boqj ,d0?20h-r,rb+) rxjayd ; p( (zdi+ojqrjn

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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 seri dnktc2v/ie5gzsqj:m-16v9 qrq 1i h,es with a 4.7-mF capacitor for a resonant frequency of 10jgm29rqv6 se1q q-kzidi5 /th1,vn:c 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 neede::xao1 pf3pvpd in series with a 3.7-mH inductor for a resonant frequency of 3::ppv 1x ofpa1000 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 wit 8a3vsalmw8khwkk b .-b+ + uodw;dm:9h a 30-W resistor and a 40-mH coil if the resmk owaw838vb ldd+9ua+mb;s:.-wkh k onant frequency of the circuit is to be 1000 Hz?

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