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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux n8 wnjnxkcccl.v3 ,p)h:c - i-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 state( kcjs3d1xz 4kyk-3sb s 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 c* ih)j0ru j;p4jtuutp hz7-,zoil produces what kind of change on the induced 0z*htj7jtpuiu4; - u ,rpjh) z$emf$, 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 magneticliv:3p4e s/ r4 l(gd,qfikn-vvz9 p.p field through a loop of wire produces what kind of change oni vl ,sfzqk44 :p(-9/glv.d epnrv 3pi 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 pr/8 5irkj7fz jgoduces what kind of change on the induced 8r/k z jj7fig5$emf$, 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 magnetic field an vkbg,qphh/udr79b aap y 4 88 +ee./bx$emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a c-0 fj *s8s5f3mocizud)a3u n conductor will be that which tends to produce which of the following effeca8s*5c ff 0 zs3dc3nimuoj)-uts?

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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 6 9je;c v7lsowflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (w6vc loe7 jw9s;hen 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 flatn9c uvt7l:saajf 9j s.h kv+,):h/yp b on a horizontal 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 (whet:fla npy k /7ajj, sv.9s)c v:hb+uh9n 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 mbg nr1gv 2qxc+ 3i-6ma region where the magnetic field vector points 6+i -crm1vn3mgg2qx b straight up. 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 table top in a region where the magnetic field vectk he: ith;wf h6 +rsff228+nvror points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fielh+sn 6f:ve2+ftwrhk ri 8;f2 hd increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic04hf+j2z m5 r2ld 5j inqaso0u field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direcs+045l a nj5r2z hd2fo0uqjmition 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 carr p dh*8ftdhq3.u m6 -e7brxh)mies an ever-increasing current northward. Two coils of wire lie flat on the table, one on efpm6- qbht 3*um7r).hdh8xedither 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 nz3oitq5)yj9 k orth pole entering first. As the north pole enters the wire, the indujkq9)35oi ty zced 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 rotavphd*tps7 - j6ox+ovm 6c-i a6ted at constant angular speed about an axis whose direction can be varied. In a region where a uniforma xdo-vh6oct 67*jivs- p+mp 6 magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whos8.gid,,wanhu +p mcp4e direp 8,n g.d 4uim+acpw,hction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of 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. . 8oghs9eko.ka-p *dm
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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 t(rh9 u6t3i 0wnn;4 lbqfwxb7 what an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The s cdg .a;sqs/1$emf$ 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 nor8r5 d.ss9ysv.q/f jhythward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodyqr 8s.y.s hfsvj9 /d5.

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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 velocin5d,q-sg.brkem l *. pty $\omega$ 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 tranj .gpbkt /lf;y9n2e 7e-z md)fsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotateqppl9 qz1 i,c7s through 60 revolutions each second. The frequency of thepq1 q9z ,lipc7 $emf$ 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 dev /x-eat/ ;w6.h oeje nc9cd9urice 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 dev t6l 15wnekoq9 ru2mg(ice 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 secondary coil containghfr8f ;x9j *y)cvtvrl: z /z1)nwk)is more loops than the primary coil then it ifv81t; jwyhi *cv:l rz)) /ng rxk)fz9s 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 o*shn0pm 75zmprimary coil contains more loops than the secondary coil then o7 ms*p5nzh 0mit 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 p: 3zkee02o*ta j bn/xpower 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 c 41h aq0yk8vrqircuit,

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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 ar8pz 3 na(atnjy(gde2 q37m4ee kl., cme connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is4l3k.jt mqyp7(m(z2c n8 g,eeadnea 3

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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 bay+y++ fi, lmmcttery of constant terminal voltage. At the moment contact is made with the ba+f +cim+ yyl,mttery, 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 ind.nrdi38 4fjwh (mx 1oxuctance 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 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 ch0 )8xd*-blfxj 6ld,go6 pnh4/hpis 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 w ds8qlm6s8. i)wd-i uc8kxp) are connected in series to a battery. The time constant for the circuit represents the time requiredc.sdw8d)smuipl-q 88 w ki )6x for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batter-asgy1sfp ,5m y. The battery is suddenly removed from the circuit. The tisa yf-,gp sm15me 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:wpr wo l7qq33e 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 thm0q iw6z u) wpyu f*:g;*fpr ic6e7**qgzkb 3qis 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, j7muvll+.r)t the current ).jruvt+ml7 l

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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 ch5/ rvij :+roboanges by what factor when the frequency is tb+/oj v o5r:riripled?

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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-1ojdq yzl px:sa34;q inductor is doubled, the inductive reactance of that in 3s- :1pydz4l;xjoa qqductor

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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 inductogc0ara76om9 q j*l 232a5pbom4y fuh hr approaches zero, the inductive reactaj a2yor7 h5fgc90pm2u 6lbh*a4om q3ance 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 connec16 h7kbu9z*-b*w cnmt z4s)-sazi feyted to an AC power supply. In this circuit, the current w ) nk zt c1sfz-ezuha9y4**b7-mbis6

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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 frh1zj /r-xk2 dpequency ishjx- rd2zp /k1 tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage )qes5ovg2 p5i gei2i8xy b2;uacross a capacitor approaches zero, the capacitive reactance of t52bsg qi2vi5)gou pi y2;8e exhat 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 inductor and capajq tvkld(-(0 5wd. qiycitor in a RLCidq(qdk (-0j.5 wvytl series 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 gyr:gdw r 2wcjvmj5t592h7 (uRLC 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 impedance of q*r/d o1hqaf.r5y9 pz the circuit increases if R increases. When is this statement true? yr5pf1d*9z. /rao qhq

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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 if vqomi wvrz0,j,g8f4; $X_L$ 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 cirf-3 -l;q hqfmvku* c9hcuit 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 capacit( :7fmnya*v p8bk csft9jx f1;ance both double in an LRC series circuit, the resonant frequency of t7v8mfbta;ps 91 nfy x*:cj( kfhat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. jz;5veliq , l7 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 serie cy c9f kl vz:7f(u92cu9bai*o3ukav8s RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rod, ddmmd3 w,; itik2z-tating in a uniform magnetic field of 0.20 T. Find the magne -mdd3m,dzw2i kt;di ,tic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of rad2c(golqgb+bu04h v7- p. i el cpn6-fqius 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 magnetic pc0 v6opl(e-fql7+-ng g .4b2qihbucfield 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 rotat/ -2z( )qca qdyxfirg3ing 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 -/rcxdiq2y az 3()gqfvector 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 ofgcv6ri0 3 aw,m/hg* 0dgrt. (n+kzhny 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 cu, w.8cqek/d/fnh. ldoil changes 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 square f7ht5vntwat;v1+r + m y(lp(sprame with sides 18 cm. A uniform magnetic field is applied perpendisyh5lvptwvm+1a( p+ trtn;7( cular 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 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 a46ar ;lgo(:0u3 nn rqau*mlgknd an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns alno7 v:w x 2pj8n+j6srnd 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 wing span of 60 m fli*h: gzy0ac;x*lsfoe ;5si 5g oes horizontally at a location where the downward component of the Earth;*e* salh0yg;i5cogz:5xsf o's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rota1:nl.j 8 +xja zx8rqaates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its enaa8lx:8jr jqxz+a n1.ds 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 lo nd515rt+w isoops 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 of 100 turns of nsy *z7 oh6pq2wire 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 tqj)q c)mrf,v* xg16dits armature. Each loop is 12 cm long avgtqxqrf 1*d)6)j ,mcnd 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be 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 turnspl7vhd 151yw7ingr nr *r*bs8 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 generao0yg -z4dai4 qtor with an output of 12 V maximum when rz0goyia4q4 - dotated 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 -w ,+lawinj0( ud,kwr4vk)kt with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto0eb5w o(ce:)fs1kqb d r operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a rea:-y (gao0vc )sz(rf wvvmu 0+sistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed itvvo-c vsw0(uay +0f(a m)rg :z 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 k0 j6z1ei edhbbao; 6.0 W is connected to a 24-V power supply. The operating currentbe zia66( h1dko;eb0j is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resis5wr/ e6 xb0npfh)orksrq.u q;:, bv,w tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wpb .)qwn6rfwru;qo v:,b/5,sx0rkh e hat 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 Wc+p lpl)f 7-8dtl b3nd is connected to a 24-V power supply. The operating current is 1.0 A at full3 7 -fp) tncllp+l8ddb 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 uo3sjhe8;f(-0u yn +pj5 fv-xdzu sj.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 causes 14 A to flow in the se 05vnayllw0c. k,kyh( condary. How many turns are in the s aw,ny5vk00 ( h.clkylecondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ho;-a3a0 sb,p4hwvd3 p dzy l l.a,0limgw many turns are necessary in a 110-V primary if the 24-V secoa,p 0yg4.;d3 da0al3lsh mlipv w-z b,ndary 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 a34nc5 p to6qkprimary coil and a 2000-turn secondary coil. If the current in the secoan 45qp3o t6ckndary 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 transformme;uc :tj.db z7th qnih0gur1- u:)v1er. Assuming 100% efficiency, how many amps at 24 V can flo;ubdue 1njtr h 0)-7iv:qmh tu.z: 1cgw 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 1i- civ hx8);qegg:f6y 0.0 mA. The primary coil operates on 120 V. What doe8g)fqi6 vxcig :h-;ey s 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 primary coil and 300 turns on itzd z/(bhii .ok2r1u.h s secondary coil. If 120 V at 2.0 A is applied to the primary, what voltah/.z (huz1r.di oib2kge is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its pf dme/(q4x b9f r,v48ru akjr/rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curren98a/4rr rmvf4k/ud,fqj b x(et is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has f:o*-me1 kxzu z(nox2 200 turns. If the ix( : 1- mefu2koxn*ozznput 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 sece(izt) yd28t9nez fg;ondary has 200 turns. If the input voltage to the primary is 100 V, we ctizfd;2e t9ng)e8 y z(an expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200hb h5tpxr1 /b/ turns. If the power input to the primary is 100 W, we cabhb1t 5x pr//hn expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage isg71eg4 b0k lhs usually stepped up to 4500 V slbkge g0h471 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 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 stepped g32po xwj7kkkq f02e8 up to 4500 V by a transformer and transmitted through a power line of total resistanc8 j k2pf7koe230kgqw xe 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 12 y-* bdle84slh0 V. The voltage is usually stepped up to 4500 V by a*-8el b4 syhdl transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not 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 0.6oxei.f 5 8qnjf *)zlk60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not usee5l okfjz)*86 x .fniqd?

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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 0.60kto f(qgs8,h-p4zlp :d-f2 lq W. A generator produces 100 V at 70 A. l-p 4 fd:kt h,s2ofqlq8g(-pz In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted51 io.g1g cyqu down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of gqiy1 g.u5co1at 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 genefvvh r75 x4;oi0r mm:qrator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generah;vrxv4i0 rf 75: oqmmtor 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 current of 5.0 A. How much energy is stored in the coihaby8j ;)d2ob l's magnetic82y ; babhjd)o 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 resistorj ( u4dkzq-z9oz(x;h0yjs+4n ka,lqy and an 18-H inductor. What is thi9 qz(+ o4nljjyx 4skda h;kqz(0,z -uys circuit'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 a q6dcrtqk8p)o t2y4k7n AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed d(,x1 1bkew4 /e flhuf-r*dsy into a 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 into3 xa)a-in rzlcnsw .j tqvhb :knj:.,,n/q:p8 a 120-V AC outlet. What is the resistance of the lamps:vn3n jbhn:):,qa- .nlktpxr/aw c qj.iz8,?

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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 120-99zq skv 6 xhnf+m-ba1V ac power supply. What is the peak current through the resistor?fa91v-9n szbq x +6hkm

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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 i.uj 2qts7 0d):jqip oa 120-V ac power supply. What is the power dissipatepujsqj0 27dq.:ti )i od in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wbkqf;,f7 . pfitycf5* 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 a 50-W resistor is x3+omfogcjlt+ md;te-:q +1f $I = 0.80 \sin (240 t)$. 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 504d7xx9 mk uqh3-:ctd p-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of as+x7mgrwljx;: 2pwz ,pf (7h v 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance ofap 7q2a naeg,7 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*eltf jp.4efe o z4w6+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 for 157 W of inductn c50/f ahh qk8k4f0bjive 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 inducx0*c/cg k3*l 8hvcf+i1p gf wns s-bhr 7b55lltor when 120 V AC at a frequency of 20 kHz is ap/5cfccx**hbgvlih ksb wn+5r03l7-8 ls1gfpplied 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 a8 .r.bdy ko,;zyp8qzr 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF caphmq*qn3 t/ 0mbp3nbr0 acitor 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 5nbc fzdf6( buak,w 79dr5 zb7+0 W of capacitive 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 cvifsl746mu2- myc2tzapacitor have 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 will theyn;opmn9/l t1us w2-m capacitive reactance of a 0.010-mF capacitor be 100 W?o9/t1; p2wln u nms-my

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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 capaci z;7np*fd9 wubtor 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 1yzb ;+ d.; auhob s1p3(uxs:ku2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance? bo+zayu;xbd;s: k u.u s(p1h3

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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 resist f)3dmzf f66ufq df. nzd0m/vwv2j 35bor, 20-mH coil, and 1.0-mF capacitor are 0bwv fmmfdz335n j v./dq ffz6u62fd) connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mp iwbx *.gbkx)e fo +6011aa40jingavF capacitor are akvfb0 aj4g 0 p 6b.x+1gii)e1nwxoa* connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected+dc. c 9witk 4eb bt 6n0*;zbinwzv)n4 in series with a 20-mH inductor, what is the im bbi;nnb4 w)c+*.0dtewckv6inz4 9 tzpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, efsyyqy9 *kk i1 y75:pwhat is the phase angle at*syiyf9yk: 7 k 51yeqp 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 with a 20-mH coi sq;b4 syc);4.g bsglot)jy x0l and 1.0-mF capacitor for a total impedance of 100 W at 1500 )4sy b)gg;bqt0.;4ly sjxsoc 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 c*qxeq hy qt51)apacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzthq1 )* qyq5xe?

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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 45b 1ugnfbk 1 hm* w.tqf,4eueovsq4o79y 3.d6k0-mH inductor at 5000 Hz for a total impedance of 400.3on vkeg y qk 4dq6*79bt,umf41s 1.hou webf00 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-M4 yz .bod(v4)mqbtb+gv n9fq+ Hz for a total impedance of .4nbfdmt)v4 bq (q y9 ++obgvz150 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 if,a4d p* m2gv 8h,qwnqh :l*7hji jp5an series with a 20-mF capacitor. What is the impedance at 1000 H4i:*jm,2dhv*7 a 8qhfpqja wpgln5h,z?

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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 wi2n.i1 *yws5tigxgx 8r th a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?tx g258wsxg.1nyr ii*

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is ne;yrb*c va0 qq(eded in series with a 10-mF capacitor at 1.0 kHz for a phase angle oc(r0ybq q* ;vaf $40^{\circ}$?

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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 a t ,9hpioh ,a5owj)0k.dciqfi0otal impedance of ha do0k p)i,90ij5qfwoh,.ic45 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 s9 ;e.tr(yq xvpp 6fir3dih z+(eries with a 100-mF capacitor at 120 Hz. What is the phase ztxy. p rp9fe;(h(ii r+vdq36angle?

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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, a rn66;qzb(o/f f)hj h20-mH coil, and 1.0-mF cap6r6)f qzjhb nhao/( ;facitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of av 2k82br vikfpv/cq h9t)c;r, 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powrh82vtkv2)cqvc rb ;/k, i9fper 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 tup-hma704 kmW, and an inductor of inductive reactance 30 Wk0aup7 h- 4tmm 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-Wmk 3ilgmq 4vo,qfa+61tikh0: resistor, a 10-mF capacitor, a ogl:tm 6 vfk1m4,3a qihi0+qknd 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;xib zk54lw h4 series with a 500-W resistor for a phase angle ox;zb4hkl5 iw4f $40^{\circ}$ 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 = qxzfh 61g:x0h 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum pow0hqxx h:g6z1 fer 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 resist-gngwv q aa3h3xuz::)1 buek6ance, 15.0 W inductive reactance, an ugkbu3x h)a a -vq::ng31w6ezd 10.0 W capacitive reactance, when the circuit is connected 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 ci zucx lm 6sm)7,gy. k,3lij,qxrcuit 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 6y9ncgl*7 xyc*0 W and a resistance of 30 W. What is the pyc l79xcgy*n *ower 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 containing g4ldostul yspz( +t 69i,7qj(a 50-W resistor, a 10-mF capacitor, ty(dl zqt 4g +i(7s96j spluo,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 sevnu32x,9 zzcx ries?u x9vxn z23zc,

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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 capacitor for a, kx+4tlyrcr9wcow) tx3 s 9w7 zg97jq resonant frequency ocw)q7997 j y4korwl3t gt zw9r ,+xcxsf 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 zd bhl9( /syw;zqz2pnq(;bu q6s 4 wd8with a 3.7-mH inductor for a resonant frequency of 1000 Hz4z dnz zqpl8shqbqws(;d;/uyb w2 9(6?

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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 resi n34yr)mqn0rjstor and a 40-mH coil if the resonant frequency 0r)n rjqmny34of the circuit is to be 1000 Hz?

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