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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 uniqg;g ez tx 35)94rqjbfts of magnetic 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 states that th (guay5ax j9a-3 d4gjge $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kindt0a tv 8 z 3ca o5q5e/;htwkcp*v1kfi- of change on the i;et o8-a1wk5tkq3 0c /f*p5tvvhzcainduced $emf$, 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 fiel v 2 remcnq;/7v(nmtl8zv4p/zd through a loop of wire produces what kind of change on the induced 8r2 n(mp /7qve;tzl4/ vv czmn$emf$, 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 on the indu+z sp(qu* ty1t tz+ts q(uyp*1ced $emf$, 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 fielbmvrixi p7r1io0. m -6d 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 conduc:r/qae+ 98b z8)w7o65kj xbujtm gwqttor will be that which tends to produce which of the followin:xw 5jt7jrb6)koq 9aw/t z+bq 88geu mg 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 .3nvw4qodhmyw *p/z/) p gw e-ek5+s knw;ll0on a horizontal table. A bar magnet is held above its center withwd h. s ewkpw vg5-/lnk)4m0*w/l;3+zqo e ypn its north pole pointing down. 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 m n1(; w pi- k6bhgb:jnlm5u64u(bz)hnjnoo/sagnet is held above its center with its north pole pointin- )/((kpo;6jlwos mb5ih 1j4bubn6 n: ug nhzng 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 gvhg -j3h nmu53jc4v*- wx.xol u7 )ldmagnetic field vector points vjdjvuo- . ulmnx w-h)475g3*3lxhgcstraight 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 magneticn4x*0ts. dfym field vector points straight up. The mmx4ynsdft .*0agnetic field suddenly 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 horizontal table z(,ez; v:pohj b6xupki8a kdz8f7 96itop in a region where the magnetic field points straight down. The magnetic field di xpz(6d jp;a98uiz7v h,eofkzi:k b68 sappears 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 horizontal table and carries an ever-increasing qf8if hme1zq 84p 11xncurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from q f811efmnz481 iqh xpabove, 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 entering fzmkvi0kc /dlel88 4q a+umi; :irst. As the north pole enters the wirevkc:+i ukeiq88 /4lmz;l0 m ad, the induced 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:alo 7w0 koop3 constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic f plao30ok:ow7 ield 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 rotav t5+cxn9 ee2jted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien e2v+njx 95ctetation 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.l ;ewn3j3 m6 q6)atypy
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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 tg8vwzqw4 g1;9 4zfrhfhat 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 magnetn5o y1:7 bxoprxl c87d*v8 cktic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the: e juvrv,o8;ktds.rttc;8v: east-west direction) is moved northward at constant velocitys v;8 r.;:cto,udtv:v e8ktrj through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant ang+(ta t*+unsfm ular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transform.8e7n b6nsztb9s84zakil . ;vdaz2 fc s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The fr*yso1ji)z eb7 v95oytequency of the*5iy y1v s79oetoz)b j $emf$ 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 us8w1vpm2 ls,ey ed 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 db /0 i*-k2d tox*zbc7v m +(qc5kdusrdevice 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 seex rj(3e v n ;fw ii npx*;ndzko-)m6*fwt.;)econdary coil contains more loops than the primary coil thenjpf;* nwx)em n e*ftwd ;k;)in3z-o.vx6( i re 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 t48 sl u09vcwnkhan the secondary coil then n84u90klswcv 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 ivdyxtin )y03kkj :mux0bz: s)y9 es*4nput

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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 circuitpx)lh6,1ahhx+2 tf cfcp*jq8 +h(km ma9no)p,

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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 conne s g7m+vqkw9e4cted in series to an ideal battery of constant terminal voltage. At the moment contact is made with thw4e gm7sq9+v ke 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 inducws3z8x(:w6)k6u-rhp 4yzs xvgz zc r2tor are connected in series to an ideal battery of constant terminal voltage. At the moment con sh8:kzx 6ygsz43 zrpw )cwuz -2rvx6(tact 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 resistance R is connectw 6u6pfcofa+6l2 3daged 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 , 5 sly9hsp4q3a wrqj1cy,pv: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 connem (ij ,ri9 (li+ylc(i ,z*bzcxvz4q h3cted in series to a battery. The time constant for the circuit represents the time required for the cur*czimvx (ljl4i9 (3+( ycbi,,hzi zqrrent 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. The battery isq8;8jr v ur2km s;kr 88umj2qvr uddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units ex4k3lw6 ae(ui xcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this ciraa/fb ,e44osa u* 7sjscuit, 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 +,/1bdvn lgie an AC power supply. In this circuit, the curren1nv+gidbl e, /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 wha. v8*jx7f5 6rg 9rdfsw iscp* 3fcw0irt factor when the frequency is tri 0r36 * jxgf*c8srwdp.i scvf9f r7w5ipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, th)edjie19 er ihpxo3(3inc() qe inductive reacta ie3i1 rqdx9)(3e j( i)hceonpnce 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 vxlkt b1t 6(,pcoltage across an inductor approaches zero, the inductive reactance of that coikb(lt61px ,tcl

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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 connecte 6;gj(hmftbo3fhq;i 7k3k k0 6y0(9jz tlkubvd to an AC power supply. In this circuit, the curren3f(0mh0jjgz6 tb lo( u 9hfk tkb;3ikyvkq7;6t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactlinon 9 75hst ,n9;zscance in an ac circuit changes by what factor when the frequency is tripledz 5;t7, 9inohnslsnc 9?

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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 across a capacitor approaches zero, the capacrw3q4/ ux4n pritive reactance of tha43/wr4npux q rt 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 ind5ac hhy1v 6uh7:mxo/ouctor and capacitor in a RLCvyohm7 a hxuhc1o/:65 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 RLC circuit is dtyque;tx1* 1vefined 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 impedanc ukozjvu a4361e of the circuit increases if R increases. When is this statement truouk 14z3 6vujae?

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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 in0.kkr: (a*hwkgotjs 0creases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit.4aiv7 l*j9-ezl-regr4 d c6h z 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 capacitance both dou+rteck8wuyeizvc- 5) x.-f4 b ble in an LRC series circuit, the -w tb8rx.i4f-e e ck)vy+zu 5cresonant frequency of that 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 +j gv ,mr0t6qythat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occ uguknaj 0v.v;, bd6+xurs 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 0s tzbnbe*1lrt6z 7l1o9 a lk(2.10 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 field vector are parallell tt(z72b l1arekl69 zb1 nos*.

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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 0.1hm :r5q8w7d ,u/an z*lwo:u2ch7jyrp 0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throug/h7y l7:juwmhd c5r8p ,zq:nrawu *2oh 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 inw/, *t xa2 yixkg0obl; a uniform magnetic field of 0.20 T. Find ti o0/alx ,ybx;2*k gwthe magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area ozp+sxz:q3 d3a f an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from xam 7wz md).8u$4.0 \times 10^{-5} \; Wb$ 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 po-:snk 5 vcs4on a square frame with sides 18 cm. A uniform magne4v-:s p5k scontic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 15p.jy 6o0cbfb72f9 btb turns and 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 and area vt q,yl5 6q lyzc8x97v$0.20 \; m^{2}$ 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 wi 9afw:z4on-tkdukyr08xx .ls. pn/y-ng span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field nay.krlns4 0fx 98-:.d/o xtykzw-up 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 rotates at a constant aniursy94g8b0cxfa .x 0gular velocity of 2.0 rad/s about a vertical axis through one of its rsiy0a . 8xb0 4cg9xufends 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 andh feikmq;vo92zt24* pw(, 5;sx xxdnu 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 ws7 m)6xoqia* dffyop o6v .m,-ujwm5u pm4 )7fire 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 armat;v:n bag4jymu0o-lx6ure. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage :m4a;0n j louyxvg b-6of 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 td spkfy ,v2b1,urns 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 i x(avrj5q 8q9AC generator with an output of 12 V maximum when rotated at 60 Hz. Aq89va( qrjx5 i magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxildc6ea6+ blf+mum $emf$ 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 z o*4mdt5kg/his6 al aq9my)jd4jj*;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. b,u;:mjk 0rep00 W. The motor operates on 120 V AC, and when running kjr0p:, eubm; at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co:-m(qafma3yq i2h asi002 cnonnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currentan-ai h i(ao2qc0s m3m 02yfq:?

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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 resistancel- .1bej taq0i 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spee- ilje01 qba.td. 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 3z:fp qcv 2ip*r q2fk*is connected to a 24-V power supply. The operating current is 1.0 A at full spe3 :2fp2k*cqfi*qv zrped. 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 needey; pcqcvg34l) qo6uxu2 3lr(9vatry 2d 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 cfnso-()eid1yue + 9 ca transformer causes 14 A to flow in the secondary. How many turns are ice1fsyne9 - u +io)d(cn 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 2kb)ak7r 5a,q 8awhjoare necessary in a 110-V primary if the 24-V secondary has 100 h2wqj 8ar 7a )kab5o,kturns?

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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 ah)bjay(g ntx, td2t/( 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in t )b(n(yttxdja/ 2t,hghe 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. Ass:op yyn)vx2s eq3: rgk) im7oh3+nks;uming 100% efficiency, how many amps at 24 V can flow in the secondars+q3 2kesnok7 vnpi 3 hgy)r:;o:myx)y?

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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 sigtt82ln 9b9fun)k3 ha8kn3b dan transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What 9kbk8nant lbantf 3)h8 23du 9does 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 onc 9(u nyczpt2q ,b-: xz9vqb*d its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage iyb9tx,nqz cqzu:*d c (p9-2 bvs 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 63t n):f lybhq300 turns on its secondary coil. If 120 V at 2.0 A is applied to th3h:tby) lqf 6ne 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 turq69dj+jlyk )+p r77vdyl9w abns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currenl ybqka p+dyj97jwrl69) vd+7 t at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnsyaa r8.klg qv oi1yd1i gr-5(3. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to 8a (lygryigio3rv .d ak51q1-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 200 turns.h 2 ozpuc.doi3e .9*xh If the po. ch2*peoux odi3.z 9hwer input to the primary is 100 W, we can 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 is usp666x4fve0. rz /lh4+kdj(vcrwfc vjually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbe 4ckz v/f6l64hpvj xfc06dvrrwj(+e.r 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 produces79ea0 zuc77*m ejgdy h 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in tuzd y79hm7*jcega 0e7he 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. (zqzzsbffa c)uy,1d++xhb3 gz 1s+fswb 1n *4 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 th,+ xfb1a+)s (db 1+*zzz fyqzf41hgs3 wusncbe 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 kmua9q:bn7*elf4me.gh08v a *jll j t:w 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 voltage is stepped up with a trans0l a*8:j9 4agt: mwv.qehlu en*f7bl jformer 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 lnt;zebg8 2o7h:j1f7x je sie*ong has a total resistance of 0.60 W. A generategfsxb72h7e* 8noe ;it jz j:1or 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 is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much leu+s ea+g 8vj+so( (ggdss power would be lost if the powero(+ug d+g8ajs (e g+sv were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line wocpvra )/xvvvd+m h+a0 ,:p x(ith resistance of 0.6m(v+0p):ropv+ ac vaxvxh/d, 0 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 y ,r:o8r5rul l5,xdbxf om1 n+stored in the coil's magnetic1 5xx, l,mloru8b:5rfdony r+ 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 inductsh:*mj7ja 5 pqor. What is this circuit's time q p j5mjhs7:*aconstant?

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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 4 rngcg5(secfqo8p4 9pbkz( *g o5x;jin an 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 placgit- +yzr3ap632edm ged 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-V AC outlet. What is the resistance of b op tl1p,jl1nbqi3 o+xnt/ sh7g,6n-the lam6op l,tq b3i7jntn-ls/x,gn1p1b+h op?

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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 po ,a ruwyi s5*xuem,g7.wer supply. What is the peak current t *5.7uy,uxesm,gwra i hrough 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 the power e(n+t5m271q w+bvnxi r(ecsw dissipated in the resmwvs2n tcn(wb5+ere7 1(iq+ xistor?

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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 c-jswflt p 3u1(:p* e tt/ies.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 50rku0xs g +zi2z af8 5;d tysu4n.y+m:g-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 resiste r06q9( )glmp(sqmjtnx /:pvor 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 induy9pwa y w)-v w(uy62njctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH co5) 8o0vomn k0iqs cki+il 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 reactanutf-w7k ad- o:ce?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nec o*wko4,8u j+kui o:72lc1 tj b+vutpgessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency oflz ;/dktl,-an 20 kHz is appkaz l,ln t-;/dlied 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 2.11ogi5 +km (d+audj qf50-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 capacitor wu5 wtk,wp 8n97gt y.pat 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 reactance a +wk3ibkih7ie3g. .ri t 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 capzn:bi,vds29 z0bz i)r *v9fsuacitor 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 the capacit0o2welz sr i36k20 aqkive reactance of a 0.010-mF capacitor be 100 W s0i2l6kae2wk3 ro zq0?

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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 h)vm 3 jmhe0a5Hz 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 et(mi:k/ exf)circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0)ft/ki x:e(e m 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 impedack/ u.uukmenfd*o64* uj1j 1vnce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor mu*u./j 1k*o6jkn1fue4 u vdcare 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, n u- lrj)q:.2rj/bnf l20-mH coil, and 1.0-mF capacit /)qlnjb .j- :2nlfrruor are 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 ilsqwy9x3 nx 1/n series with a 20-mH inductor, what is the impedance at 1000 Hz 9xxql3/s1w ny?

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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 induce5wpt. 6lok4j tor, what is the pk. pw5e64jo tlhase 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 no*:i.:f.ilkpx hnwf8 :0 o snxeeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total imp: x 0 8l.:fkwisifx o*:.nnhopedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriesq+.txcp3;3 nk*eq nmed*cr l+ with a 100-W resistor and 15-mH coil to get a tot*ere qktx .nm3 *p ccn3;+d+lqal 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 m :ctyq 48cw9evszko/c 4q9)r a 450-mH inductor at 5000 Hz for a total impedance of 40000 ) cz 4m 9tcqoyr9s4/ev:q8wkc 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/ jb;tnivgy;9 resistor at 1.0-MHz for a total impg/ n;ji;ty 9bvedance 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 series with a 20-mF capacitor. Ww202cp+ z+fpqktcvn 9/l;x tthat is the impedance acxf/0t2c tpl+qztp; 2w vk +9nt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cwsn,*7im773nn nte jlapacitor at 1.0 kHz for a total impedannmtin7e 7njws3n*, 7lce 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 ph9dljhw:j4+*k kig+bg7p s3jm ase angle of : p jmlj wgki3+k s947h*jg+bd$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needeiddov5*4 zw zr+ 6e8mo/xex0m d in series with a 30-W resistor at 1.0 kHz for a total impeda d*x84me+vd r0zo6mw5e zxo i/nce 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 capacitor at 120 He+ 5dy oufv+(zz. What is the phase evdo 5+ fu(+zyangle?

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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-mzlg. fh9epx +km35p4dH coil, and 1.0-mF capacitor are connh4 k 5pgfpd39+. zelmxected 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 reb w v0o ,onibglxa nt++ /3t9g-4.zmfmsistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the nt f/vmbz9n4xw3.b ilo g mto+ -ag0,+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 inductyavd th* i/29a lq a15/v yfda5avyr;.or of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power v vyv5aa9 .ta1 a ;if5/*yhaylrd2/dqsource. 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 sl2rt) 2 x0wxvhzd- 5zueries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a)t- wxl u0h2xzdz2vr 5 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-Wb9bd u sfdoposbn0*k:ldmdb1w 6-745 resistor for a phase angle obwdp 1 sl9db-moufks0 :d n4 bd6b*75of $40^{\circ}$ 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 = 5khxj:5lpnbtzl+ -l) 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have+ x:z-htnklp l5l jb)5 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 6 sv /:w7kz9a2qvmosdac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pow6a:s7dk/w9 2 ovzq mvser supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is 5m-q-z :ntw14s8m a4 qxyyeug$63^{\circ}$. 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 circuitbc2vc4kp; x1 xbb:a ,cf0 cab0 has an impedance of 60 W and a resistance of 30 W. What is the power;kcxb cab0bc:,fa0bc14xv 2 p 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 a 50-W resistor;nz3sok-w kkss*r)5 s, a 10-mF capacitor, and a 0.45-H inductor, when consn-ss soz*rkk53 kw);nected 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 serie9run1mjt*pg-h 5k4,xq50tb9akslk v s? 5nmlpttk5vr0hxgq4s ,j9u kakb19*-

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needede2rufnge y 55 ke (yc9nde5n5* in series with a 4.7-mF capacitor for a resonant frequenk5 r cf9n (5y*ueny25eeg edn5cy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant f(y8 c*3m)boavcd)1 e:l hap nvrequencae3)b p(vcay) h1:lcn *do mv8y of 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-m366lcyzh+crk bnlh-) H coil if the resonant frequency of the circuit is to be 1000 Hz?hck6zb r3 )+h-6 lcnyl

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