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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux npwf 4u*d(l7 sexcept

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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 inducti)io7k9z(k7 qes8/tg (fw 46elr l g:a;nkaizeon 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 x(xj bypn;2e :wire in a coil produces what kind of change on the2j;xx pb(e:ny induced $emf$, 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 loo6y5 plv,n9lwtyv5b c*.s /nh qp of wire produces what kihvwqnnv slb ,y6ly5 tp.c/95*nd of change 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 produces what kind of change on thl2-; y bac1mdjfe8wt- e induc bl-j- amew2dyf;t c81ed $emf$, 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 ma m+c ,e,gbapl-v xh1g7zvga-j*q/xn - gnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a t+u q3w480tnyo rg6qqconductor will be that which tends gt+wq0 836u4ytqrqon 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 horizonz5eh( vme+f4) ks -igztal table. A bar magnet is held above its c4khgz v m 5)(i-+sefzeenter with 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 ot5c slk*)lw1z w5 ot,jn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and w jslt5olztw*k) c51,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 tablxpz*-dgm ,8 e fzo r,9xg)zo(xe top in a region where the magnetic field vector points straigh 8)o( drxmzp9e-x,z*fgox,z gt up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fieldh0z((vjl0bw19wla b v (dj+cn vector points strai(l0(9bbvjjdhnwz0wal v 1c (+ ght up. The magnetic 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 top in-f-: ebh 7eg7.hsnoxd a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed h do-heefsbn :.-gx77from 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 horizont(o.d50z db0z6paw o,n.hgi hou a7p u8al table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the i7z58u,po uno zhdb wda..h06 p0ga(owire. 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 )h 9--p+f pr 6drkzgxfwith the north pole entering first. As the north pole enters th z-rhgdkfrxfp6)p -9 +e wire, 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 rotatprvv h+u:6xqj 9yc(b )ed at constant angular speed about an axis whose direction can be varied. In a region where )c vx6 :h9b+ (vjpqyrua 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 zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about anwk2jov 4:sjqc. 6nz0 n 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'swj:062nq vok z .4cjns 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.uljo;fe q0j )f-pgh w2/vv5;n
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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 .g o :z,et1q*ycuw+fdan $emf$ 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 fieldfa4 :j6ux.snmq 7v+lv . 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 east-west direction) ,qylb:ypmwb jt2zz +y/+ h+de72mwk: is moved northward at constant velocity through a magnetic2jyy,y z zmw2+h d7:/wtmk+qb elp+b: 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 rotatestfj8.gyae44 i.0 zh) ljl,s if at a constant angular 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 transfordnc2jt8) t p;dms

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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 thro*y alnrclf8+3ls, g: sugh 60 revolutions each second. The frequency of the : l n8lag* c,3ssflry+$emf$ 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 devicenh1;:zg;c(jfh 1jny7xgbt 8i 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 dev3flfiap+gv8 9 ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the paxz1p - pxeeaw6e2a *8rimary coila2ee8 1z6pawxapx- *e then 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 than t:bf6ro.pj 9ea02+z z1zds/nbn,cxvthe secondary coil then ir:z9d b.x,+jnbns 2z0vc e1t/p azf6ot 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 powxsem 2:d.fe y76mcq8f3 r* dfcer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuh5p1:wv.lb-4oqhrd b it,

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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-z okl.x 0 fe1c0qbsl1(gh qb+ of constant terminal voltage. At the moment contact is made with the battery, the voltage acrlbqe+. k(z0xfsb c0o1-l1 hqg oss 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 a nngixtsr4-3 xg/ w30xu:7qoun ideal battery of constant terminal voltage. At the moment contact is made with therx4 wq0i tus n gox3-u73/nxg: 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 r9wf7e, alm ;ta8l oam:esistance 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 connecte(o fx ,ie, e1lxai)tz*zpz .n2d 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 serieg)xkw3ui 8nrdv091qv s to a battery. The time constant for the circuit represents the time required for the current to 18u) 0x gv 9n3dqrkwivreach

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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 b b0. egugb,6vqattery is suddenly removed frggb.u 0v, eq6bom 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 tbinf9i - 0u.exhe same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power sk 48rf o ro72n0y3l+ 6:/qwzuk(s bb hsqc(sdrupply. 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 connect*w-ki/tmc78d / fsb tned to an AC power supply. In this circuit, the current mnw8it/sfd bt/ -*k7c

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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 aozq-x4r y98v nc circuit changes by what factor when the frequency is tripled? yx-qvz49o nr8

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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 doubw hxk5f33 ddc;led, the inductive reactance of that c f3whd ;5d3kxinductor

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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 acr4 giixq upjq*.5pnjt b4-6m d2oss an inductor approaches zero, the inductive reactance of tht6piip4b*2 qxj5jq d4.g-numat 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 tk mmnt ,an3yz,vtpvv( v*u7*2 his circuit, the curren,u 72 t3myv v,nvk*t pnz(vam*t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor k6h x4rvc-st-8m+bpa when the frequency is triple 4m -tks+bcvphrx-86 ad?

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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 t q t ckj1f21p)ynw:o3uhe AC voltage across a capacitor approaches zero, the capacitive reactance of t1t2 wkyp 1nq :j3uo)cfhat 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 tmxf9y2ofrj 2hqm.g .;8;zc ehhe inductor and capacitor in a RLC seri;.2xq f9jhyr 2m ;zeg.mofh8 ces 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 x/i os5w /w+q- qf0wtzcircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit.9sswfbu4lhby.8j 8 4gil s*0i The impedance of the circuit increases if R increases. When is this statemfj*bs 9 wiub syi40lhg .s8l84ent 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 circuihb v h msdlz0e(4pk b*684d7;msiu z.iez)uu8t. The impedance 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 circuit. The impedance of the circc 5 fzt.1zlp(uuit 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 capacit9p gfoscm/ z53 b89hunmd d87hance both double in an LRC series circuit, the resonant frequency of that circub8 fmuo/99 psg3h dnhmc75z8dit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied,vn/ m m)jyw:t 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 +arekw ( gj, nh-3lblpvd26 4eRLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of raddgq2j3 oi9;x eius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field qe ;d29o3xgij 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 m is rotating in a+rod ng ,(xwbhk; 9a//ni /swm uniform magnetic field of 0.20 T. Find the magnnwr 9bmkos/ g n/d,iax ;(+w/hetic 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 in39kcv+sabdn gu5 m0c) a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop accka g u +n9v3bsd)0m5nd 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 sin-pp u,yf+ bvzyqn o ;qzl743y6nq1j(fgle 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 chel(2* xrkf o-p;(rz )efzvbz4tw b 67hanges 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 turnw61u z7/9se9elikpwb,lu1:di a b +nts of wire on a square frame with sides 18 cm. A uni1u9l7n+:i bd9aw lk1e6tup esiwz/,b form magnetic 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 15 tajx9r /l:am rh- *ngw1zr b3.burns 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 wo 3/qk2fphk-8hc ;qu $0.20 \; m^{2}$ 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 where the v 4-)z u v qi/4hfo yy;s,f4rjc7k1ijndownward component of the fc44 7 /zryi-vjq ,i )uhvj;sf 4onyk1Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a const7i6rnyxx h 28pant angular velocity of 2.0 rad/sx6p x82yn7ihr about 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-sectional ar ic4y6id 6os:sea 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 cons+, 1r3gdpql tdn.g6. 6ur rtpkists 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 r4ps)g csn;q 6eectangular 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 the long side. If the loop rotates in a uni e46gpq )sns;cform 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 cons+fm0gzpiu. 4r) y 5twoists 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 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 outputni, vjf,w.0 om of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotat njv,ow0.f,mi ing 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 generw) :bri 5o z.ne: jmww8jvkcym o3*/4rator 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 msxv ( cx oe+j55ask em svp5iw, tj4q748epr,1otor 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. b, nplzu,9th77 w gwk+ The motor operates on 120 V AC, and when rup wzu7bt7k+ w l,nh9,gnning 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 internhvxn /+6f2bjeal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What j n2hef6/bx v+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,jkdfo ov53zg *9hns+r54 knqdmp3f2 6.0 W is connected to a 24-V power supply. Thsp h*k fdf4go29 k3zoq55d vr,n3nm+je operating 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 resistance 6.0 W is convg4zv44gd4(wi2:s3dlhi cp qn.m h8dnected to a 24-V power supply. The opera n 3w zdc( hq4m8sdivh44g .g4ilv:d2pting current 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 reduce elw(jf1b.jq (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 x.x)di ,2sa8 q e kxr31r*teqna transformer causes 14 A to flow in the secondary. How many turns are in the sed,xnr e)q.*i8 xar 2k1exqt3 scondary?

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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 9xgs2dde g(k9 are necessary in a 110-V primary if the 24-V secondary has 1 d 9segxd(k92g00 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 sec ld0 s9z-d1evhf2, as+0y minmondary coil. If the current in the secondary is 3.0 A, what is the c+yhmdn,fs v1se0z0lai m 29d- urrent 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 primaryska2s . ;uh8up of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondarpsu2 8hk .s;auy?

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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 sig) 1i2xo7ukwjih -t:qcy q)t x/gmoq +2n transformer provides 7500 V at 10.0 mA. The primary coil operat /u tiitj2qhqm)- k:oycwgq )7 x+ox12es on 120 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 coil and 300 turns on itx1 (qn;*+dv9wg 88 tgpgufugf 48vyu is secondary coil. tu g988vvnfw d 4 1gi ;qpy(g*8fu+xgu If 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 uy4p-ata kr/d/iilip);r ;c 6turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present ity4r/p kia irp -;ulc6 i)/;dan 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 q(c8r11o m9f9.rxvvh+5l*ey qycz/fb w p k2isecondary has 200 turns. If the input current at the primary is 100 A, p11o w9cymlyvh/qfqi x.+cz(er f985v*2 rkbwe can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns anx8d( uzbr4dluy9g (g+d its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outuzgl x urbgy+d94 8d((put voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hat ff0m urd +lnugk+:9*s 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondar9 +gldtr* nmu0+f kf:uy 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 cul+t( 2 g8doyeu m2+dojrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lie j2 8o+g (y+m2dudtlone of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current atg6 .pzhr0r88l,h)hd ltaf hd5 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a l d,ah88fd.h0 5rztghp h)r6lpower 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 Aqsiwb5 z.v+ vnu l).7b 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 re.wbui)v.nl qz7+5s vb sistance 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+5hczwmu7 r1f +iw;6 nqrtd0q 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the originzq +rd 56m+;w 0rwifh7qtcu 1nal 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 long has a total resistance of 0.6rshy9:+np5vhh d u*w40 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the 4wv+:d5 h9hhpnrs *yu 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 6kz;sn8 van3xv b23cqaxmz7 .wb ,uy9*tns1 3y-W line at 1000 V. How much less power would be lost ,1x z nyt 3z vy*3cq3vnwus;7axa b.2nmbk89sif the power 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 atou78c*xhqp,5 w qca5 j 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 wixp5h7u qjc*,q5w8 ao cth 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 carrie +hn0bn;0 0hixh . qvkmpdx7 6;uyod:as a current of 5.0 A. How much energy is stored in the coil's magneti u0 io0hnxax k0 :y;dpb7hq6v;+ hdnm.c 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 contai-aujg d24z+gi9p2a gxh,y v+ hns a 6.0-W resistor and an 18-H inductor. What is this circuit's th ia2aj2v4+ x guyg -zdhg9+,pime 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 circuivqfs-8,lk topw25jybmjr 0- 3t 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 ivv,gbtgbiy, gz * ;22es 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. We uky 4+f oe4j0m,fv0shat is the resistance of the lam+4u 4s 0 ,o0ekyvjmfefp?

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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 powevi+fi7/9ve )e f3 avw 6za1nker supply. What is the peak current th )a6wfee+i a/ eik vz7nv1v39frough 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 a1xu9+/dx1 lkag mbwqgni,04 n e;i*tac power supply. What is the power dissipated in tug/+tnl,qk in9 axw*ig eab01 d4x;1mhe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is nt u a,o+pdghgv 9p gm m6g(abf12g(83$I = 0.80 \sin (240 t)$. 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 uu9 h rg4jkidws8id:j5ai((3 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W l8410 tl(xu k0dmblts 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 indutnvizs 501)ncctor 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 coil at 1000dm g0l)yl8g)- nfwe96ur 0g 5e4lll8+ay wfol 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 in )a6v hztg;4ueductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hx56lqwc3wq0 b z?

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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 ,zynqgz;:+9 rv :ppmlat a frequency of 20 kHz is appliedprmzv,n lq 9::+zpy; g 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-Vf b+nke:lez5;, 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 capacitis nl17 /((*o(cxgvr,d omujieve reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 5qu245 d)k9gy1o wrp cc0 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12;u;y/gm/ llbz(m hzc9 mp 3gl,00 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacito+-- 0re6elkd2y 1f snd9yvp zgr be 100 W?v 0re- fdyl2ye6 k+ 91zgndsp-

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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 capacitovnb + *p0gqlpy4r92e4 ifjbb 0r at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedancly yaxmzevq+2a1 c*-5 e of an ac series circuit with 12.0 W resistance, 15.0 W inductive reazqx2e51*lmay v +cy -actance, 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 at ip7r1v9ee gk r)(; q/reeee/w1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in peee)7r9vgi ( qr/ew ek1/ er;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 -4 50 ut f2jdrnriv4lhresistor, 20-mH coil, and 1.0-mF capacitor are connected in s j-dtu20v5 flrhinr44eries?

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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 a 20-mH inductot;e 9cf pt2+;goheji5r, what is the impedance;itc et2j5o+e fh;pg 9 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 connelz.c :y8e4yvw1 )prfets5p 28 b+derycted in series with a 20-mH inductor, what is the phase angle at 1000 Hyt.:f err d +ev)p4wc1y28 b5z eps8lyz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit wiu as5v5 6gds(i0 jyon.th a 20-mH coil and 1.0-mF capac0so 56ny sdiga5v.uj( itor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in s:fl+ . cgyhe6:u1t 7lusumex4 eries with a 100-W resistor and 15-mH coil to get a total impedan4l fh e7sm eyc:l.u1u g+:ux6tce 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 inductor at 5000 qaa 3bqtu a/aga781q6Hz for a total impedance of 40000 g 6ataba uqqq3a 8a17/W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MH;q9)r ;b tucugeu i7sw:y8w9k z for a to r)sucwueg 9 q9k; w;7tiyu8:btal 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 connected in series with a 20-mF capacitorhcp69 cqjbqmim+v*h /+5s 7b/lu9 rsfj+a1 oe. What is the impedanc+ 6i pe9cu5sm a*9cbf 1slb++o/7hvm/j jqqh re at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cm izh45b6 h8acfle 8e gmk(b1889felrapacitor at 1.0 kHz for a total 8 brk(gm8b19eealh ehcf58l4m6if8z impedance 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 wy*7 sblay 2r d 6f-iz(epqh *7p66hkvtith a 10-mF capacitor at 1.0 kHz for a phase angle of pah r7lzp76 te6hy**yvi6k2- dsfqb( $40^{\circ}$?

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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 kHu od dg.g9/i+mz for a total impedance of 45 Wudgmo d/+i9.g ?

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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 10wnsep.:q n4 f(n 3a.1pb4s0vp dl 1eii0-mF capacitor at 120 Hz. What is the phase ann41 bn(epqv.wa:epd.l03is4ps1 nf igle?

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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 1jkrzkn 4s ym * z89v/kz:bq)-i.0nvy8m /):szzi9b 4k*kz-rkqj -mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistoy-i2jw0wof t-r, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connect2-w- ifjwo0 tyed 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 capacitive reactance 3jt.r0fg9u;w l,a4d g m0 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thl.g4 f,udamwt9r ;j g0is 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 circuith ,yc.7 uykpmlwyr:dpa27 t:4 containing a 50-W resistor, a 10-mF capacitor, and a 0.y,.7 dlrpayct2pm:k:w huy 74 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 res,y0 .rmsk );xc ;ljf3 u.tvvtaistor for a phase angle o.) .0jy,rv kvtt3;af; s uxmclf $40^{\circ}$ 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 =coh drp ))0wu( 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to ()u0rchw) p odhave maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W j1uwljfmkt: e 7 s*f*-inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectj*jm e7ku1sl:-w f*fted 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 ACfwez yw(8 amy17v g;a5 circuit 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. Wh/sf f emsqk*a6b2l/pp g-2q;:.ew avtat is the power factor?ps-g/a2q *.f:/ amke wfspq;b 6 lv2et

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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 resistt74.l0uyi0ef s )fn wkor, a 10-mF capacitor, and a 0.45-H inductorf.fw) 0s7ynke0t 4uil, 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 9ygkgsy/7 apv y,/tj5oky 1,kcapacitor and a 15-mH coil in series?vsk k159ay 7opj g/k/,y,ytgy

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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+ /7o clotf6gn a 4.7-mF capacitor for a resonant frequency ofc+7g f ton6ol/ 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 freqgxg7 ;gkz6 2i79;vx sl7mimhouency o2 kl; xsg977;6gmvoig7 mzixhf 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 resisl4( qlqtj)do1 b3m8omtor and a 40-mH coil if the resonant freque8bqodlqo)t j(l34m m 1ncy of the circuit is to be 1000 Hz?

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