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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 followinge,2hq2 o5ven4on ef(e are units 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 s/tdh u67jp ,ix s.)kxj2t5j-l0hpcn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wir kylp cmhpuwzn74we30;8- biyajdt wn j (*78*e in a coil produces what kind of change on the ind 7j* nm7uytl 0*-zw(p34;nd ik ew8y8chbpwjauced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop o7it aszj)5lg* ao b.3zf wire produces what kind of change s7oal35i)z*bg z.t ja on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produn* blfd3*cz1cx(dr )k lznk0-*ihw0 sces what kind of change on the indul3sb )kd dz (lhnk0x-cic*w *z0n r*f1ced $emf$, 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 :l x cd569tio,r cy9pqan $emf$ 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 9g 3q5f(bksc dp1; ucvsxay72ill be that which c3vcq7a;b5dsfu 2gxspky (19 tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal t0u c vla5h4hr,t3 w3fnable. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromf l w3r t0hcn34avhu,5 above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above:gch5m*k2 mfab9 6mj m its j mmb*6 kh5g2fammc9:center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectoid38nz e)6ib+zs1ukf/vb, v lr points straight up. The magnetic field vanishes suddenly. W,z lbe fsdvn36 i1kuvi)+8 z/bhen 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 vect ,frq0x+j 0wkvor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in jw r,fxq+0v0k this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region whb: g3mrjlh) iuea7z9 8ere the magnetic field points straight down. The magnetic field di: ie7jb uag l98rh3zm)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 **n ;hprm4z; hy fg3sctable and carries an ever-increasing current northward. Two coils of wire lie 4h*;3*s;rpznm fgchy flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterinix/*ahm 76t9h . bciivg first. As the north pole enters the wire, the induced curren *9icht7 i. mx6/viabht 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 constant angular speed about h :0*lzuq dda)an axis whose direction can be varied. In a region where a uniform magnetid l)qzu*:d ah0c 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 wir*y -1yt1jvle*qquwk5 e is rotated 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 orientation of the loop's axis of rotation itqq*-u5y *vl jy11ewk f 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.:gfn j.zd- gaj l7k.4g
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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 th9ul;:kpjh x vvua h1c 4gq 9)aykt0.9pat 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 as vp k4nii.,z: magnetic 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 eau4)ljk9fesu z+ xjq2)st-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acr qs4j) 2e9l uu+kjzf)xoss 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 angularusf e:1uixf/o7m-u 5u 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 transforms-om (2g-6k(vu cmg cjx

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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 bsst/ aacad4u/:;0vimkw 7uup n7+j4 second. The frequency of thbv:/iu4mas+autpd c j4 ku sw;0a/ 77ne $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t h2do 9dun9v jeu)zhr n*vc0,,o

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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 devic w4 .s 7io0cbbsy+yb(ee 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 cxb btcu5-h/f 1 g;u+lmmdn(3jontains more loops than the primary coil then it is a(cg+uumnxhm5djb blf 31/-;t

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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 than the se275a3i ewtmtqs( dy+rbc q(:gcondary coil theyq(3e tg2a7 rs +:i5mt c(qbwdn 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 iu2n5cc ese bqt69j ;90c t6ftnnput

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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 civ ) :heq. lja(lawi,6z hj9v,rrcuit,

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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 serie,i jyb,pp x5b:s to an ideal battery of constant terminal voltage. At the moment contact is made with the batt b bi:5,jx,pypery, 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 connectep(hyh wq9ga//i5 d ue6d in series to an ideal battery of constant terminal volta(hd9h/6q/ap e5i gwuy ge. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit wiqgw cwi,v9 (r5 7vxb3dth inductance 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 wdz 3w/ivak iwl6r:*p di/0ta .ith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecknz21,nco:jjl pwy 2/ted in series to a battery. The time constant for the circuit represents 2j2wl,zcknp j1 :ny/ othe time required 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 inductouw56vysy01 kkzlyw1 t gt w(/f 27ymc;r are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represe6k/ts t 11(y7lmf kw20yw5gcuyvz w;ynts 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 1e e hclj 1/3/dw1y g)vyezxa*the 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 Ay s;f cgws4/h9C 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 connectehzm7a 6f- 3f9u8ep k83dtlzp od to an AC power supply. In this circuit, the curren 9pzz7dup38 of l8ak-t6hf3emt

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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 circuif-1lrrf pv dfhnh h+5+hj -,-srs)vb)t changes by what factor when the frequency is triplepsjd+ )nsh51hvrf-f -l+f-rvh) ,h rbd?

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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 acroaxj8q/pg 5a8p)jin.a m ,*9 p cbn2uzdss an inductor is doubled, the inductive reactance of d z 8/.5m)pc a*9uxpb i2qpaj8 njag,nthat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, b+inabk1+y+od,uq 13 f) wpuzb7j y8rthe inductive reactanc1inj +dqowukz+ +8 b1bry,ufab3) 7pye of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, ttqt)t941* y t wx9hcsxp 0o3wrhe currenxx*w)wt9 pc03t9sy41 toqhr tt

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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 cg9i7x e,y:gbdhanges by what factor when the frequency igeg y:id9b7,xs 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 across a capacitor approaches zero, the cavozli;vrg:p 14lh w, -pacitive reactance of that capacitor4hpw,rvo 1lgl:- z;iv

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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 t/edyv dgap ( eq(c30f0he inductor and capacitor in a RLC series circuit?ygp f0d3d( (/qvcee0a

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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 defines d g. ;9b3 ,lv8 ,r0se:uudkx:ozesbud 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.x1+z*at (k6bfzi hvb* ) mc.ij The impedance of the circuit increases if R increases. When(fi1.x*i bhjt6bc +z *zmv)k a is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of iyf6x )5 j9tqi/sf/jyovor i z-l;5 -7cdqbp)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 circuit. The impedance of the circuit eswn*aju,5 :3s 1x*ztg(kcgh 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*bmwu ou ;k26ya*e (iu the capacitance both double in an LRC series circuit, the resonant frequency of that ;(* 2uoakbumi6wyu*e 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(-ukmh8 /-nmkph/ 8djbcqhh 7 by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs ybv ;a7gw*ncz4k(kvs,4 t6 oj when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a utvyc*; // t1 yqs4a9pf0qmv hiniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo qvpfy1mtcv 0 /ya*q4hi;/t9 sp 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 radius 0.10 mex(iz j8cjd 52m1/npb 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 xej 5(pdzi1j /c b28nmfield 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 uniforgsp9rzbz . wq f-4-o/rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnet -.gr9r /sqzpbzf -o4wic 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 arr 4z.q6se7gxuu lbz 6uel n md4+9f3n0ea of 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 coili vn*ar); y h0ddndo2 s6tbngm5 *46gh 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 frame with c2rroc:.7kwkg x*fv+ sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uni:k 7v*c kof+rr.gx2cw formly 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 turhm6g: snr-c vcu-fn0( ns 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 1rz )o6lzxcz, 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 flies horizontally at a u6jy ye l62p:veo+tj)zpv 4u+location where the downward component of the Earth's magneticzo2 j j+6vtl 6p+uyv) p4y:eue 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 ade8f.4hsy/x long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a c8e/fh4a . sydxonstant 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-sectional area of sr6y94oih fn7/m fig9$0.25 \; m^{2}$. 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 consistsj+s/ gjp3bb 8rj9j-umirki 5 8 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 azan- 1icy)c)(s,zwy rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to then (wc)1zay -sc,iya)z 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 ofl1-f8kxjb* ov, h,flo 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 1ll-/y in gni *10b0pek2 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating c*e1y0p ll/bnk i0-gni oil 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 generatuudmlu cir17*s0;t+bsp 4r, 5d(swh eor 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 mototof )gxr2yd( -fqi-m9 h0j8p mr 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 on m6hko/c *1znk120 V AC, and when running at full sp /cko m1n6*kzheed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected 4o 6 ;0q*end04+gxb)cwrha0toky wi lto a 24-V power supply. The bo0w0 ny htow; 4g0 ei +q*d)crakl6x4operating current 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 resistance 6.0 W is conny6hox 9xbsv udr/wi9g1ml t195d /y8y ected to a 24-V power supply. The op/1xm/ 68yh u1ytygolbrsdd 9xw i59v9erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal cl- x2zi:3(ce t 7-qct0ufurp resistance 6.0 W is connected to a 24-V power supply. The operating curut0tux( q c zrf2l c-7ipe-c3:rent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to rba1grhb t2mtqu0)/xr-8 4 opreduce 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 23hjxyfd*;6 ubfowc)ny+u0t primary of a transformer causes 14 A to flow in the secondary. fxj6tc f3;+b o)u w0y nd2uy*hHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how 0*ufgfgw7h kt5g k +p8many turns are necessary in a 110-V primary if the 24-V secondag ktgg 7ff85+ w*0pkhury 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 hj1-hsv6( hz ,nwc ror0/yg5l500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whhjl gcryhh1 n05- 6wr(zov /s,at 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. Assuming 100% efficien- , +w8 r laon+ef*lxg.0tlfsscy, how many amps at 24 V can flow in the secoonf . exlt fsrl-0s8l+,a+ *gwndary?

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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 aofqh8jw e tn ,/6bgr;0 neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does tjnh rq tg,6b ow;8f0/ehe 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 itbztx(s.b pk *3s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apx3z bskpbt *(.plied 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 hq9y1 tj *aeeu2e(bk0c*k n;jdas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied (acq *n02jt*u bkkedy e1;e9j 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 itsvc an50bjfz5; secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondafjvz55b 0 n;acry 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:zgm8b rs7cqu8/.rvs 100 turns and its secondary has 200 turns. If the input voltgr 8rqs uv/b.cm7z s8:age 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 hac8 hb6s/ -)ii3mqcy vs1/m ud61oz;eb9ewnzms 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the pwnm 1 b hd1q s6iuo ee9;cz3sv6my8mz/ b/ic-)ower 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 volt*532poa +dohrkrx 4rw age is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number raxk 4rhro*o +d53w 2pof 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. T; fn411ra /fyz7 jpdygfmm4o-he voltage is usually stepped up to 4500 V by a transformer and transmitted through a pof;moapry- jz1f yf g1 74n/d4mwer line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stk9rh (ysxx*m +epped up to 4500 V by a transformer and transmitted througy* rh+mx9(x skh 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 0.60 W. A gene)jc io,,d re4rkbmdu3x 7 v-v.rator 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 woulm d vrue,,c-xj)d bi37r4vko.d be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genersok60 cwvyg 73ator produces 100 V at 70 A. In order to reduce energy loss due to heating of the traocsvw 360yk 7gnsmission 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:o2fvyt94bba ml;t d- less power would be lost if the power w o tdb2bam9f 4t:;yv-lere 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 85oz/9hixmct 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the o8mzt h59/ cixoriginal 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 eng6n11h+g kx;mase ze7ergy is stored in the coilm1e+se kgn6h a;z7 1gx's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W reserww * mpa*x:;:lr fz(istor and an 18-H inductor. What is this circuiz;ef:r*m wxwrpa:l ( *t'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 p(d(ky yf 40jljhn en:l. ibr5t)(k -vAC 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 into a 120-V AC outlet. What is lv 9c guc+(7tathe 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 rla kq9a ,n,.houtlet. What is the resistance of the lamp? nal9r.hakq ,,

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cxj0km .g9 ;zguurrent thrkgmj9 ;gu.x0 zough 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 6.qn0snv ug;mdissipated in the resistor?ng0u .n ;vsq6m

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a0fn eytzff52bt k5yvt7qi ,(5 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rr,g hqyxbv6 1c+gi- wzoum6+- ((mdmv esistor 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; b lj y7j0 q4c.3u;yhril(wq3etsdl5-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 1.0-mH inducto; 2l wa*rng 1*erelv)zd uppwl53mo3.r 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-mH9e534 lzwcnnxzb 7n-t45v ejt 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-mdcq ;n2grwvaw 6-rj ,5H coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary foy, ,2k)ngr whgr 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 whe/4cg +s b3llwtn 120 V AC at a frequency of 20 kHz is applied tol cbg3 l+tsw4/ 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,f x2tl(z2p3joxfs *b , 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 reao jj yo.yoi 5x6/d:y0vctance 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 t7j1(qioay)h s (is bsv54x4 fro have 50 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 rk2po *ydx2i( r5qp8 na 10-mF capacitor 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 ca4v/:ojn(:8fsa icd )ckq8c w vpacitive reactance of a 0.010-mF capacitor be 100 Wsv(8nk:fc8: o/w ccdq)a v4ji ?

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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 1l7gtx4. w7qtusk bl xwa9 43f.000 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 ,ic-vd5d,:jw i v3db zseries circuit with 12.0 W resistance, 15.0 W inductive reactandc,jzv - bv3:dii d5,wce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance jxg3 aek3zn (2 l1w1kxat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor 3ng3xkl11k2a x(ew jzare 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-mepj.ln ,vt+q9gjc(uza6p4ro:3 b awu1 4qy(p F capacitor are connected in seriez6vbjlu t.(n q3p9+pe,owj (r44caq1u ga py :s?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with ag;gzwq whp7*xdt: 9 s- 20-mH inductor, what is the impedance gwtqg 7x*d9w :zhps ;-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 bjntoq gv0v4bfl9m6t28 - vr4q 3)tqy in series with a 20-mH inductor, what is the phase angleq4y8ttvbv9) qbr2qvol mtf nj6-0 4 g3 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 needg.z6 al a0a-d0ekusv 1ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impe1.dsvz -a00 eag l6aukdance 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 series with i+spk eyzt. );is, fj+-hkna 2 m/r2zga 100-W resistor and 15-mH coignf/;h j,2paytm -k )ks+z+zsr e2i.i l to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indui0 ur3:uqqh o4km-.0wm ssv/ ictor at 5000 Hz for a total impedance of 40000 s0qvuq.hoimi:kr4- /u 30ws m 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 wp 65su4c p n2fb5xf1hrith a 100-kW resistor at 1.0-MHz for a to4x 2b1frc pufh n655sptal impedance 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 connectejojr:z.x 9jo;d in series with a 20-mF capacitor. What is the impedance 9jo ;j:jrxo.zat 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 needelkwu /jfy. j.el 33i k;j3u6snd in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4jeskik/.j; 3 .3ynu6 l3fluwj5 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 i (ht5fn0; tzu+yhv 1wv p*t+r nk/sa:for a phase/pwtnv(;ky :vas hu50n+thf r+zi t1* angle of $40^{\circ}$?

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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 f142a dkl 5:jup8n.gdmkd/v sb:f (hgjor a total impedancem .4(b5 djlsugvk2:a :g jkhdp/d8n f1 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 f,g(:ga3xf aazg bs)6 at 120 Hz. What is the phase ang63fgbf aagz,xs)a: (gle?

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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 10 mm9mi.d) (okn2w hmv/0-W resistor, 20-mH coil, and 1.0-mF capacimnm vo) m.hi2/9dm(wktor 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 ofou:bjr7b8)fxj: -l z o a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H indujl o:bu-jorzx b8 7)f:ctor. The circuit is connected to a 120-V, 60-Hz power 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 capa. tfpgco0cb(c0yyp4behbi :; a g7,u2citive reactance 30 W, and an inductor of inductive reactance 30 W are connected in serp. ;g(c,7 ye4bp:gti0c2uh b0yo a fcbies 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 j avab/z t r:uya8k:;ey/vk2ema34x6a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inrzba3jxu 6k /2ey e:ky;avaat8m :4/vductor, 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 seri4b:8y9e gzw hoa*i:kw r6bgg7es with a 500-W resistor for a phase angle ow i7kwy::*zoag8bgh9be4 6grf $40^{\circ}$ 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 ftld r;b iw-7n89 j+i3jrlmy7mF. At what frequency should the circuit be driven in order to have mf7 rjmlrj ;iiy+lb7 tn-d398 waximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit wito g.*d4( ezfxbh 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the .egfz*(x4ob dcircuit 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 circ i.-exblbor8((p8dhvy wu y(,uit 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 sfke/7rkgrd7:gh qii+ 4m+v 8has an impedance of 60 W and a resistance of 30 W. What is sgfm4gr77ike8+q:vr /i k+h d the 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 RLC circuit containing a 50-W+xyw 9*t t(uprs ,nd +gd-r.ke resistor, a 10-mF capacitor, and a +w pyr t*x .t9d(+gdske-,nru 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 capamz +qgv9b h,*ccitor and a 15-mH coil in series?,cq* gvhzb+ m9

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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-mhun)e8 t*efoywxi -w, r3n9g:F capacitor for a resonant frequency otg, -ewf83ie)un hrxwn:y* 9of 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 idcp8k oy/ee9: 3futq,nductor for a resonant frequency of 10 y3kt,/fco8p:d9 u eqe00 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-Wnp2) bycp3vw 6 resistor and a 40-mH coil if thep cv2) 3nwp6yb resonant frequency of the circuit is to be 1000 Hz?

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