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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 magnetigo zx+-fd 7tcon7uq nxpk6+7 0c flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction statest(p /l)4,gba q0rgbkz 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 l0u rhi89 bhqk:8hotho58mx9cx, -7 jzp imam:oops of wire in a coil produces what kind of change on the induced ohthj :omxmb 79a8h-uz:hqmp,r 8c895 i ikx0$emf$, 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 throughg; i.m)naoaf / a loop of wire produces what kind of change on the ingmo) a a.i/fn;duced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change o8l.zka c93*f nw f.*mh rttte4n the inducedh.rf a9wm* 8 tlt. 3*ctzkenf4 $emf$, 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 fie2t:hdghfaa2ov)3 i -x ld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor w gimgxb7-v+pz)x d// rill be that which tends to produce whi7zib+p x )grv dx//gm-ch 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 horizontal table. A bar magnet is hoaiiby6(v5rq q9 oe r ar1s-(6eld above its center with its north pole pointing down. The stationary magnet ina6695 rviyeb (irs(1qr qao-oduces (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 tablea1 2xl,i cn8 8bcz-rww. A bar magnet is held above its center with its north pole pointcc8xi,8l- 1n r2wwzb aing 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 region where the 5+9t/ shs)2y/*cnghdtu: lq jef r4rfmagnetic field vector points straight up. The magnetic field vanishes suddenly. Wt/5g shl:hy4rcf)9t* d2 + /jner uqsfhen 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 ma6g*, + pssa xhlm8-zbfgnetic field vector points straight up. The magnetic field sudde l8*ah fxp6zbg, s-sm+nly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a ho letrx3 e:5a++iv ay;qrizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currenqr3+ax5e +li:y;tav et 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 k3 *x )hoic0ffever-increasing current northward. Two coils of wire lhic*f kx)o03fie 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 w( jzp:i c4ruzsq,- jm/ith the north pole entering first. As the north pole enters the wire, the induced current will bsirjp j: zq ,c(/z4um-e (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosjzh,bq2q0ap 0 e direction can be varied. In a region where a p zhb0 j02,qqauniform 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 abou d blff9v-+/a1qp8o(r, u ,bkvnapf l5t an axis whose direction can be varied. l(/a8,ovf5k r9fpn,dqfu+- bv b l pa1In 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. ((sod6srm6ff5w s.ba
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that all3rf7 l-2 ketn $emf$ 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. Thve-efjz0 ,d+o e $emf$ 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 direcbk vyri0k4 /z6tion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning th i0by6kvrzk4/e potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular vr:pr.y l 9+cbuelocity $\omega$ 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 ori,rn2hr l0:dzv*1s31nfys4s.n 8 tth t4fjtransforms

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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 revoi wv*4dj517ubqy (* gqxh ;esslutions each second. The frequency of t wi se5sh q(yb4qu*;v *g1j7dxhe $emf$ 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 devizrn tdp c*u5rk8 6(6 zzlgfcn,5 enk//ce 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 devo*-et5t6rgyw,- nqje b.nz- oice 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 ca08p5lsa wjt :ontains more loops than the primary coil thel8 t0jw5aap:sn 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 contains more loops thgx:z xjsbxzk/5oa 3id2c2guh.+ z-;tan the secondary coil thensjx:235h.u x/ at-kzzbic+gz d2x;og it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputpz)*blv sayn,an,xn+ ...jf g

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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 circryj8s x,zmczbg-7 ..duit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cob- , yejex2+ownstant terminal oe yw2,-b xe+jvoltage. 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 ofz ;e+(irak9m50agf bu g7 bg+ ex;x;zn constant terminal voltage. At the moment contacxn ie++g0gx( ekzzrab m;;57fgu 9a; bt is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resis7gl/( zjqxx9 l wau5*ntance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecmh. d8r-gnr8 -.kzlfrt t9t5zted 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. The ti-o1q;r9:pq8 ,q/ww (pf ayiit(tns qyme constant for the circuit represents the time required for the currenq ipsr nq 1(wy9iyqpo;( ,f- :att8wq/t 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 battery. T+ hozk(8h0 mlw:c- qnqhe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr q(0l-k whmq8:nzo+hcent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitl3fbwid5w 38a (f1oem s 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 anaf p/ *kgt r9(0cfjsb. AC 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, the cur43x,cm2lb p kq/lyv9w*) zd3 pvw p4marentpq c9m4 ldl4 vpyw/ )az*2mkx3vwp3b,

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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 when the frequk2w.3d t*ktaf n /iro1ency is tri 1fwoakt3*t2.ri n k/dpled?

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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,d p*zl*t7wfy5 c/hyp7 the inductive reacta7f5 h*z/y pydcw7lpt *nce 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 app 4noflt/70dz84xiog z )eim r:roaches zero, the inductive reactance of that coilr8dgi zo4:xf4ol /n ztie7m0 )

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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 cw ;)wp zl)t2swurretw;zws2 )pw l)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 circuit chdz iiqx/+,4m4 vbpwb, anges by what factor when the frequenbdw/mq44b z v+xpi,i,cy 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 u*z k 0oz yzr1839zb/wasxjy.the AC voltage across a capacitor approaches zero, the capacitive reac s zraz*ybu/yxk8o1 z9jw3.0ztance 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 vol-o g*7y wgmrs1tages of the inductor and capacitor in a RLC 1gygw s*mo7-rseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as0f q9,* zejt ((0t5uygwhha td $\cos M = R/Z$, 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 the circuit incre)wbz jwa(7v;3iw rtoji 9q3a ;ases if R increases. abzojjv; itrw9i7a33; q(ww)When 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 imp 2gmv.sg8 jy/am*yrg )edance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series c0;t s(+mj:mf)- ucjfrwv:x z kircuit. The 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 and the cag6q frx; 14kvh8vr3 /fklm.iipacitance both double in an LRC series circuit, the resonant frequency of that cgx6f1;h kk8v lm .rvi3fqir/ 4ircuit 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 drivengj q: )0k8 lfz0f0)vmdlrbe 9g 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 ciuv zx5p*+sbx )rcuit 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 rotating6 q(zqxql9 37puivd3h iu7n5a in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector nuuqdq3hax7 i 973z5iq p(v 6lare 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 ro9+dau:uph-82)z m xyhvqz0m qtating in a uniform magnetic field of 0.20 T. Find q-:zh 29m8 p) q0yuvux+admzh the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field ob.0 -na9xcm spf 0.20 T. Find the magnetic flux through the loop when the pb 0na.- 9mcsxplane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single lh;2f 6a/o6w zqa2x imjoop 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 0g 0vjpaaq(lwwu9* 4rfrom $4.0 \times 10^{-5} \; Wb$ 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 frf+ ;xsqfo7v 2dame with sides 18 cm. A uniform magnetic field is applied perpendicular to thedf7;+ oxv 2fqs 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 and an ,it-6b/ssq jp6scduk 6w b)*uarea 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 area9xoxd)0m2fo j $0.20 \; m^{2}$ 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 location wherexg9lll c 33i2j3gv 6bg the downward component of the Earth's magnetgxvjgg6i332cl 3lb 9l ic 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 ofr.mbr1 83krthat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s ab rfrrob 3mk1.8out a 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 has 50 loops and a cross-secl8ff)t*x y fk;tional 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 ajq z6 l16swr+iw(36bga-sco100 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 xnf 3 8f3+o ax;oo8vivrectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis ;8 +38afvxvin3 ofoox parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns 6tbd(/ xrk1qkguhd: xyl,ggm 2 qun8 / p-p6b1of 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 generators0z x7ya e,zc+ with an output of 12 V maximum when rotated at 60 Hz. A magnetic fieza +zxeysc 70,ld 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 gensv9 6 mxmf)4fuerator 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 mwpu ja*f4k q96otor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates o8l(zacy6 4 ojt*tawl0.vv qj)n 120 V AC, and when running at full speed it generates a baj .06*tt4a w8o qcy)z(vvl ljack $emf$ 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 t y2 3x.hv:dw7hquug*oo a 24-V power supply. The operating current is 1.0 A. What is the u23h7o: d yxhqgw*u v.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 284,s0xyncwy mrky oce0:f(5v4-V power supply. The operating current is 1.0 A at full speed. w:of ecrm05,yn xysk c84y0v( 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 wcvehm8,p/6 g is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back 6g,wm 8pvhce/ $emf$ 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 i,4jea7u .a 0ji7p kvak n7m-axs needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the gc):mdcf:z/*dom l7psecondary. How many tur)cd m*/mf7cpg:l d: ozns 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 ab)a5e5df ix2b) b s7eyre necessary in a 110-V primary if the 24-V secondary bf5bde5sb )y72 ai xe)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 se :i rm7s(o3wyif2y u1lcondary coil. If the current in the secondary is 3.0 Ari7yu3m1 o:(ysf li2 w, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumings) wlc.c c sc,qdtg6k2e(nszu;h/tb+c7. 9pq 100% efficiency, how many amps at 24 V can flow in the sec(w dczkccsbqt7t9n.pce/, hus6l+qc ;. g)s 2ondary?

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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 at4fj (inb1v; o*wn 6jsa 10.0 mA. The primary coil operates on 1v najs4i1*b(6fo;j wn20 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 primary dm 4uzqsrh j445lp4jh lha 44(z18mqxcoil and 300 turns on its secondary coil. If l4 (z zphmxjdhq4 qs5la44h1rmju4 84 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itsu:t;xts5 nie l9;kr4i secondary coil. If 120 V at 2.0 A iin k4u:xs r5 9l;;tiets applied to the primary, 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 turns and its secondary has 200 turns. g:(gy xm(at o* If the input current at the primary is 100 A, we can expect the output curry g*: (atmo(gxent 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 20:- jxlnz..b ol0 turns. If :-nz.olljbx .the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns agz7-owt0)q psy3/+gvuwu3 zd nd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frict73s3+w 0wo gzuzdv yp g/uqt-)ional 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 igl92z z rqnz7.y:t95-vvqtf qs usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the vn.v zq:- q zlg 5q29tztf97yrnumber 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 at2tl -p1bawdk r *hz3l.8.3h tjq hg;xx 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. Fi xkbl t8laxqr23 .hh .-jwpzht*g3;1dnd the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppeyb3 d bd 5;cgv6qp6g)16qr*tbn tkly/d up to 4500 V by a transformer and transmitted through a power line of total req5d y*pt kyv 61)d/tnrg6bcb q6;l3gbsistance 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 53 oqq u(k-qa8u4c wovs af10iline 50 km long has a total resistance of 0.60 W. A generator producess afqkwvu - 3aooq0i54(8q c1u 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 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 lon4f z4k*)gv.2fb ekb+ xb x+oeag 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 voltage is stepped up with a transformer with a turns rag.voe 4bxk )*xfa +bb2ezk+f 4tio 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 .ys8m n;rea4r a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instea4snym .ea8;rrd 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 ax0y6 qtb0.4ivmadv 8c t 20 A. It is to be transmitted on a line with resistaxi0byca8t v4.qmd06v nce 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 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 co p8nlx.b)-,(xqe fe1u ikgcg4ilb,fxe)gn ( ki.4cl p1x8uegq-'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-W7 tr7v/fjae0 l resistor and an 18-H inductor. What is this circuflr7t/aj e07vit'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 circuit where the rms vodf. g*c 8m9qhehs-3n uq wt;l/ltage 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,bfva-vw1t *p2.im jb:d vjy . 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 into a 120- 4 / vvcmdlp/1;0qg2uny8 aa(* fmftmzV AC outlet. What is the resistance of the la1 gvat zlf;p y fd/20mv(4*au/8mn qmcmp?

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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 connec 1fz nd7hc5,s mxb-qyw7/ -ecsted to a 120-V ac power supply. What is the peak current throq /- c bhm-,57zx sdwn7sfcey1ugh 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 a 120-V ac power supply. What is k7:-ypqxx-2eyfpw8tl t (yg- the power dissipated in the resisl2eyp (xk- wytf-pqx 8gt-:y7tor?

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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 ic7xyj9vpkl53c (wpl zve h4-- s $I = 0.80 \sin (240 t)$. 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 ;2 7:4ag rir topa5sd az2kx:ea 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 76gmpmgi.* pl1n8nqs9rex o150-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.5f738 obgwgf7z)wnb01 ezfrbf 6d qk70-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 3q+o g vr1rv1xn; h sqq(o)b9b2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance cic k l;w)rlsv3s236hxf4a6 l?

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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 indu7 wu6,h4r44lyjnccpa3u utm- ctive 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 o- mmv2tc l b) jbxa56/g3x5pssq5: rkAC at a frequency of 20 kHz is appliscl v 3k r56jmqm: xosab2xt5/p)-g5 bed 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 q)i375gck ubk. 8d wwtsource?

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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 reujv5+qdxhp ) +r -)n)1gpqplf actance 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 n t4d4f.2qo95 wuo9tzr2zg imcapacitive 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 W?2l6 r bu: yh1j40wido8wvar i1

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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 reactahi6lozr +g-v0qh8t d 3nce of a 0.010-mF capacitor be 100 W?r3-gl8t6q0z+h hvido

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 2p2 m. jh2vqf;.r2gtmh)m si q1pzti4 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 0ga / .bqb ,-ug+b3leadvb7hiresistance, 15.0 W inductive reactance, and 10.0 W capaguqb07 b/vdea , + -ahilb3b.gcitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and rof8pjg.hu/4 1.0-mF/.jug 48f phor capacitor 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 ang )w7bv+ 6tvx9,r sooamzj-feu y .;zl*le at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in mwybs*t7f uv9l) z+; zro, -6jvoex.aseries?

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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 inx xt4, ihg+l)e series with a 20-mH inductor, what is the ixl4ihxge +,)t mpedance 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 k9vanc n/x)ob0f f 8;finductor, what is the p9c/vxofka;n)bf 8nf0 hase angle at 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 neevysnq-6en5m d4enqwl6 u (x.7ded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a ns.6e l yn4qexu5v6-n(7m q wdtotal 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 followingdn wb)p.n:bz4i2 hp .::vb iab capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of.bib)pbhi:nn a:z p :2.bdvw4 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 withygo3s*0qs(c k,gqy-ode rqh3:p 9hj+ a 450-mH inductor at 5000 Hz for a total impedance of 40000 W*hsc k:p o sq3h 0yeoj+ryg gd3-,q(q9?

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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-Mx wk/n7ub8xl4+ ; d fw;lakp9mHz for a total impedance of 150 kW?u /da4m 8l+kxwnx7 blwp9;f;k

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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 connectedim g7 on75vhrtesn st +6v6t(3 in series with a 20-mF capacitor. What is the impedance at 1000 etvont76vstg(n6r+i m3 5h7 sHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz foziv t0 p7/sb+ym1yz0z r a total imp 0zvzm7+z10 tb/ysyi pedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a ph 2a/yqe8bh *xnase angle o8nx2ab/yq * hef $40^{\circ}$?

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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 m*b279 9blbf jd xumk4total impedanj b*b 4ud 7blfm9xm9k2ce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capac w4*d7lo wj ng;-eh(ieitor at 120 Hz. What is the phase angeg 4w*7ho-idewj; (lnle?

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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, and 1.0k(6dhm q qz yei84 2-n+d+vznb-mF capacitor are connected in series?z8nhq+n -+kem2b qyi4d 6 dzv(

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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 capacito6;b vfgys xc y1wj(qec+gi ,/;r, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current bcs(c6f/qgjwv x,;;yg1iy + e 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 inductors*v.29gwbsgc/ i8 (jfwgq 5v y of inductive reactance 30 W are connected in series to a 110-V, 60-8.2s/9gyvwg sg*fjv 5b iwq( cHz 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 resis wcnq td3w h,gn,:t ,q:yx+i6mtor, a 10-mF capacitor,,gx,h: :q,i dwtynmwqt6n c3 + and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglb78b3b( z0f:y* cg5 etbsw7 smtp(eh ie of 3h sep f8wg5:ib7btm((z 7s*ct bb0ey $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frdn t;z3ly/er: w; cs5requency should the;rd;cs ryt:3wl/z e5n circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series cip): + e*uufs3q/7** ,dfbitnct t-tzxlu. yrfrcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W yqd7put zt,cfx-/3trufns) l:tf eu* .*b i+*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 v(wd u .dr*wshop8p8p3 w7:of)nk fu5circuit 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. yirm4f2hp i41jb,hyq,1p5 qd What is 12m1p5qjd,hip ib4 r, yqf4 hythe power 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 Rw9yf hrxx -(.(rvw c,vLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H(xyr rw9-hvvx. fc(w , 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 capacry h veql0f6.jb)*5:j*cwuh oitor and a 15-mH coil in series?cjqhf: 5*)e .ubyv*6jr w0hlo

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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 capac.7 11avhvv ojusb6vd (n+(uy nitor for a resonant frequency ofvdny uo 1+vv7(vn6ush(a. b j1 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-m(a-8 g2bdfjg;z8, x4 alw njwyH inductor for a resonant frequency xb8awj; faj n2l, w(4d8 g-yzgof 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mHo b a.rv w kt8bz/5 -(nq9.fwtmlytb/2 coil if the resonant frequency of the circuit is to be 1000 Hz?2 bnbbywrz8wf/.qt- / tv9ktm5( la.o

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