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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux uvsaj5 k19.1z skj5nf 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 inductnhqlku:;z/x pkh8ls70u2/siy k i o,1ion 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 wire in a coil produces what , cuw b 8rvf5 dhbza78:78pfyjkind of change on the induced zc8jw yh8v,f7 5ab7rfb8p: du $emf$, 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 magne4opoqg 6 d*h33y.h nq o(.cqxgtic field through a loop of wire produces what oo qg3*(ngqy. q4 .dpoh3h x6ckind 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 diameter9g-;b he/ 0psuaj4d*sd ktr fc;w 1)xg of a loop of wire produces what kind of change on the induceddtrau40) h-9esdfcxs;pw k;j *g b1/g $emf$, 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 mar rhmd7 .xqmtn22xi6n +v4o;qgnetic 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 cond/mtw pb96(zw7 sdh0 o6qad oc4uctor will be that which tends(z9wp7o4 qm 6ach6wddbot s/0 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 table. A bar magnr+mz8 dfob 6k(et is held above its center with its north pole pointing down. The stationary magnet induces (when viewed f rb+6o mkz(df8rom 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 acjaw235db+ *kt )g eyvbove its center with its north pole pointing down, and released. As it approaches the coiy2jda* g )bwe5k3+vctl, 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 regio n* yk0v,9sz rd:;r7rbk6xogj/h)f 44yhgay dn where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced j0nkh4dy/a9,:voy7yh)6f 4r x r drsbg ;gk*z 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 wher,7b/awadg ; aw)mwyv7e the magnetic field vector gv m/ww)a a,7 ;baydw7points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the 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 where the magneticp3w606jn nlj q field points straight down. The magnetic field disappears suddenly. When viewed from above, what is 6jjlwp3 0 n6nqthe 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 evh.kawopaf8lt l130b: er-increasing current northward. T1 hlao.08:fw bk3pa ltwo coils of wire lie 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 entering firkihwcwk vcbx ; ),a+)4st. As the north pole enters the wire, the induced current will be (as viewed from ab);w) k4ivacbch,k+wx ove)

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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 angksli(:yweh,h23y;(pm ww c q8ular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, w;y3hc8(k:wwel,2(whqiym s phat must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an*drh - s(n9ys+a 7s ps32ivkpc axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientati +-dc(nrvsa 2k ss3*s9hpyp7ion 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.q dva ;5r 0vqwj1+fl:q
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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 n c)gw+ wrw 6gcl;xdq88 1r8gnthat 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 g6.ocw:dx86wqn)nfq ,ll2yju8 law7 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 east-werr/ sm l5p 79jkj/w.3yxsigbtqk z+85 yi, 7dvst direction) is moved northward at constant veloq x 35.y/ympw7 58sgt ji v+sj k9k,b/ldiz7rrcity 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 , a qbhu 0n536o0zqubrb,gu: fangular 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 generatormxvh8 9 (nx0*rsihl- d transforms

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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 ripjc0;o(ahb9,1yh 5p8 + lk pzof: fzthrough 60 revolutions each second. The frequency of trjzyk9 0f; :boahz8lp1pf p(h ci,5o+he $emf$ 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 usex,3g dimvlp3ljk.8-(p le+- g 7tpfcad 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 device thtpn07-ijp(nvpbn ,e s 6 y*7fkat

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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 the59nx2ig6d w ;wro i/h4: fv:qlg hq7tf primary coil then it is a h4:g n:6d i/lvt2oihq7;9fqfxw5w gr

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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 co g tpn9ddhyj.h+0f f;/ntains more loops than the secondary coil then /yg n.ddhp +0jft;9fh 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 input+s q5ht w1 -x(s.bnr9aodn8il

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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 circu(t s/w 2cnk2i ; v1f9+igofbpyit,

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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 ar6uqmbsi kkvn2du0) ,/yd)2la e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor ikd 0uu,anqbv2kdmy ) )i/2ls6 s

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consengoacexwr8u 4i8 *-8tant terminal voltage. At the moment contact is made with t*o4 8 iu8wn-aecg8er xhe 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 ij.xgxbva ;0+z ufa-( bs 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 connected (dkca:p y 2x(eto 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 seriefim e)rasubyf5k n9; jet-5h8 .k:6uds to a battery. The time constant for the circuit represents the time required fym8ik;k aje59 . tusdfr h) 5unb:e-6for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a mub/1b:*s3r n8 a6 we .klxcxfbattery. The battery is suddenly removed from the circuit. The time / lkm :fb x s6cun81exwbar3.*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 the5/b sajl, 4ada same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this1 jxsmmb/z40r circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC pir97wn q ,*hcxa z4m2sower supply. In this circuit, the current4 chq mar,iz w972s*nx

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fr9lxa7by35od 60hwx ( gbu1 nmkequency i1 bun69 h 3x7kwymd0(g o5baxls tripled?

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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 innlt zho6m, te, /k(-msductor is doubled, the inductive rezlmm(,h/n,e tko6- tsactance 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 thqz2vf1 ah +w6qtw( pp5e AC voltage across an inductor approaches zero, the inductiv1p5q twzfwhp6+ (aq v2e reactance 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-b ,ae3v nz;qn this circuit, the curreq,enb;3n -azvnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when .o 5+mkg d8olr; 3)zex)cyimxthe frequency is tx5o.;)z+8dl)ye3cmrk g iox mripled?

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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 0 7rebnah3xy4p g*.mp, the capacitive r34pha0. *e ngr ympbx7eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages k 0,c,khyld0vl; 1zndof the inductor and capacitor in a RLC serieyvdc 0k zd,l0;nkl,h1 s 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 definruq* tate7vo99: qk)a9x:h:h4 o oznted as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inck*a)0*bexlntt/ nw zme+yb 3. reases if R increases. When is this statementme*.+t lw* nae/znx 30kbyb t) 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 +(hv* ivvz3pj3. 7zmwf jfnz5. 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 kppfcmsvlq36l g08wp +dx * 33circuit 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 double i+/b ,yxwmykkq 324rnm n an LRC series circuit, the resonant f x3+qn mw4, rbkyky2m/requency 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 that is driven by an AC applied voltage. At rfa 9,hyw,aai6qq /qtqms770 st jc0,hesonance,

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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 circu1m n+j e prav3v.q))wuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magne7: ev4c yhj9--b oury0/)5kwb k aao*zihnwp/tic field of 0.20 T. Find the z hre bicon y4 0p uvk//-7jkwb*-woya)95: hamagnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rota vuyoz+ k04* pryg9lnt/qq7/ating in a uniform magnetic field of 0.20 T. Find the magn9typq/* 0uvrgzyqa +o 4 kln7/etic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of v*l0psq:mx5 paoi5- b0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arq 0sl5ob5*i- :pxvpa me at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduatzritxgr,p6 ( ue(;0 ced 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 h2tc):a5jv ci 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 f6( jznp) cjn )81.b, x(rskg-szcp8bhh3lmcorame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifo ()8jps j3bc n.(ocz ns8xgcrb- ) kh,lhpmz61rmly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arej t5qqq-+y 1 zt.hc q/g+-lf 8uiz.yuga 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 pdn9;s kv8 m-j9cgvl2k1vg0a $0.20 \; m^{2}$ 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 -ye+ h:w)eejs m flies horizontally at a location where the downward component of the Earth's magneticjeyw -se h)e+: 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 constant gvja**9cmy06 +ah i fkangular velocity of 2.0 rkhyg6 f9av 0*mcjai+* ad/s 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-sectionalfm7dfkeh,x;3l 2 (x bf 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 wiju:p fuwkgg)8ndy-n , wp 9lo3uci1 2.re 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 itstoim/* s.i,* krhv y:oia3wg: 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.:wom:ia y/g ,okv3*ir*tsih. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of d8fpj1i yi+eqtm+8(1bnm. yu100 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 0tp-e xz7uak6with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil ist7 k ex0az-6pu $100 \; cm^{2}$, 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 generato mw)ox50f2g3vu p8adi r with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates oi :7i t)lj2q. z r;ov,)fagkpsn $120 \; V$ 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 + qm)h;1b ffrh d869rqnbh2xw operates on 120 V AC, and when running at fuhd;qxr98nbrfw6 mf+h b)2q h1 ll 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 internitw b35f:wj okxm4r0yhz+(k 9al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What oiyk4xmh(f3:w+ rj59wz bkt 0 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 connectnwnmao5.du4jdpnoy1b y if n 0f12,f: /tm95xed to a 24-V power supply. The operating current is 1.0 1yd51nfjfx tmwy9.m/na24 5 :ofp,0 b onuidnA 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 res,ph 7t;ukzcz5; rdr 7w1;xs tfistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fulr 7wusc;1;57t;d kptfxz,rz hl speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary *dg3uhd 29i st.+mjb 5 yuf/lbvoltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer kdw07x vp zq.b+tn6 mdno-3pab+ 5+a tcauses 14 A to flow in the secondary. How many turns 5-.bat+zmn7 np b0p t+ x6ddwka+v3qoare in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-Vlt9p *o-. /5y jgbcrueale;q- primary if the 24-V secondary has 100 turn/*epacj9y5.;oqeu t r-b l-gls?

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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 s9wg f.8av2g rsecondary coil. If the current in the secondary is 3.0 A, what is the curreva.r2 gg98 swfnt 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( cgwoomr. r35-1mn: uc r+zwa% efficiency, how man m1r zu.rww3- (5rgooacn:mc+y amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 72ud g4pcfi24n+zu9, sddklv(f 2g; zj500 V at 10.0 mA. The primary coil operatesj+ p;fkdf9ivcn s gu4d2zu,dgz2l4(2 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 pxz 8yx)q0/k gfrimary coil and 300 turns on its secondary coil. If 120 x8/f )0qx kyzgV at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sechb4z-k+ u g6ugondary coil. If 120 V at 2.0 A is applied to the primary, what current is prehbggzu +-4 u6ksent in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200q r8yb j9y sv)l -lh.-wr(/t tm9um/xb turns. If the input curr89-(9m.j-huy)t rlvm sq ybxl/t wbr/ent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turni)u2 9)e q sg)orq,gtrs. If the input voltage to the primary is 100 9to,)ir 2r qugeq)s)gV, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. k(gtdn: abl6y6akj) c 3k,f8+ om fh0n If the power (+ga6mkh6y:) cfk38,nklf d0jno a t binput 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 axgp/ob*- /b q6rzhy6g,be / k 8cg+xgmt 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 number of tuq my / *goc6 b/6pe b,+8gbrg/zxxkg-hrns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vol*r1u -eyvz e56s x5ynvtage 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 ies-ev*yx5yz1v6 5 rn un 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 curretkbf 0vc+z :u fz/y,n3nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total y nvzkft: 3zfu /b0+c,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.m3ykhux yi: t3n 8x+q total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to uxth3yy:+ix83qn k. m heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resi )iqy nnfxm 8qqh1c32)stance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the mhfq1i)23nx n8yqq) c 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. Hhhj+vpw 6a,igcq,mvdxk 5( * f3 a9n:row much less power would be lost if the5h6*gipaha w3n, xrv: qc( fmkdv+j9 , 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 847nb fn4we2s mky qte.s82diis 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 te d.4e7ym8f4b2ki82q nsw s nW. 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 oftl h nw:ewg/7+9v 3h;;uihppc 5.0 A. How much energy is stored in the coil's magnetic fiel+7p/hhwple3:thiwgnc v; 9u;d?

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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 inductor. Whatlho4 y*ayh sh0 /lt8s0 is this circuit's time constant?hss*4a8/h 0yho t0lyl

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12b1( k 1azn9 8i y71yqns h/ywbl2p8keo0 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(v1/ a4koawi z 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 12:(2z oz;kr zqfwrb9:t 0-V AC outlet. What is the resistance of the lampzkb q: wz rot9zr:(2;f?

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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. Whtydp-h sx) 6:-w+(a rik0vgz8 p zb3qkat is the peak current through the resistdyz+0-: ik8zgskxwha6 ()v - prqp3tb or?

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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 diss8lx0wdgab5xk,s:.o + u lq+lzi:zgb o wlk a,s+50q.xu8ll+xdpated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist 1qr;o,s z80lelitdm e:do(n4or 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 resistorcfc9v j- sd.1 2xwb;qr 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 5qdyp/jd*n wayo03(qilfh1 c . tv62w;0-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 inductor at 60 Hz?5/ ,xjc gsqj6p4l6pfy

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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 reactabg8 4 v/ ipim-2m)9odat.de frnrcr .xq9/(qj nce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0e4f.ni 0(u voy szx7.k W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductix-t3avd k*ld +ynij(;ve 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 120s-fpmk5g16aqaxy+ 8 c V AC at a frequency of 20 kHz is appli+qax8sg -y5cmkp61a f ed 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 2.5,9ynme. a.b*af 9sxyp0-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 at 10gh1.2+eof c aj 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 c7*g lq(j rr:(bvq3sqcapacitive 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 mldgl4tno25 * /rs3c.ua c*l aa 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 capacitive reactance of a 0.010-mFn2 4a5znf v*eu capacitor be 100 Waz 5u4nne2fv*?

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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 m,lf0u a)sj b0at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resiut5/;tr*swhd ue73wpstance, 15.0 W inductive reactance, and 10p /5rs;uwwdtu he3t 7*.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 1500 Hz if a 1nto/a ;gu h+ ck:hh ;un*8rht100-W resistor, 20-mH coil, and 1.0-mF cap;a hch;onu81hhu t gtrn+k :*/acitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 150wto , *,fe;dba0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap,adte ,;f*o wbacitor 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 9 uoo gi x0t3r8,f zm(w5estl3is connected in series with a 20-mH inductor, what is the impedan,(toz0g5tr 8efluo i33x 9 mwsce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inducto/vbg 4w3kpe b1r, what is the phase anglgkb/14e3b pwv e 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 needed in a series 03;iqt m4 pggqu(nsb3 circuit with a 20-mH coil and 1.0-mF capacisg nqt 4 ;3puq0gib(3mtor 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 ieo925dfgin 1h n series with a 100-W resistor and 15-mH h2o9fi5 dg1 necoil 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 i( h+j, 2q4u(xrvbsn akn series with a 450-mH inductor at 5000 Hz for a total impedak qbu(s,hvx(4+njr2a nce of 40000 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 putg1 ;vlqhv/ j.i in series with a 100-kW resistor at 1.0-MHz for a total impedanc gvq;1vj./lh ie 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. What *uwd f60m jalx)s6-ttis the impedance06 x -*jsdtum t)f6wla 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-rhp(w +qv-3p1ugcyiw+2fh.lmF capacitor at 1.0 kHz for a total impeday+vf w1 p.lqw -3irhg2(hcup+ nce 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 c wfyp(wr)fp 8.apacitor at 1.0 kHz for a phase anglef.8y ppwfrw( ) 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 qelf6h9 /zhp t35o)w ovf6d3ineeded in series with a 30-W resistor at 1.0 kHz for a total impedance oflho p)hzv3di5f9w66 eqtf /3 o 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 :u(/ kxvu; wuxa 100-mF capacitor at 120 Hz. What is the phak: x;wu/uxuv( se angle?

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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 1500w)wf, i/0 b lcedmu;m( Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar;(wuw )cd mfeblm0,i/e 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 resistor, a 10.0-mF cabls rjoh2 33;8fy+pljpacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Horl8yblh3;2+ sf3jjpz 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 30 W, and an inductog xpm r0c93(;kzv;gef r of inductive reactance 30 W are connected9(e; fzgkx 0mg;r cvp3 in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containor g 24u5(x6zucb;gkjing a 50-W resistor, a 10-mF capac j2 g;bcku(rz4ug5 o6xitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series wu,/ti-ka b0o*)9u dy7rpy o-bjdzu/xith a 500-W resistor for a phase angle ofb7,o /i to/zydbjd9u)x p - a*yuk-0ru $40^{\circ}$ 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 t f8pwec*5im-3r f,sz = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source?c*fw3r mf-s ei5p8,tz

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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 resistancu/xd2e9yuq-c8fcx 6/n tl1cp e, 15.0 W inductive reactance, and 10.0 W capacitive reactance, 8 -t162ufdypn/c/ucxxe clq9 when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an Ab+ wddtb7xb9.hu -2kzxiawx97 myb0,C 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. 02kbozh/6 q 7opi5mwz What is the poweki0 o b/z5hw7 q2m6pzor 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 resnaa4;m q*r4+royxil 8istor, a 10-mF capacitor, and a 0. *8yairol 4m4r+xaq;n45-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 capa(e.e m twh +hbs;rzd ;/de(zy4citor and a 15-mH coil in series? (r +eheezbdd wsz4(ym.h;t; /

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacite swt .vk2:0zhmi h9c(or for a resonant frequwmv0:c. t9hh kei (zs2ency 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 for30)*6 wxf1qpytffd a t a resonant frequq) 3pat*fwd1f f06yt xency 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-mHzl b ,v*zcr0u0 coil if the resonant frequency,0zb c*vul0r z of the circuit is to be 1000 Hz?

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