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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-t px nrs(k;*a 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 states th 4fq ;loifm3.lat 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 9 d0f gg6saeu (q3hx9lloops of wire in a coil produces what kind of change on the inf960a(d3u e hxs9gqlgduced $emf$, 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 vv1 jo7mc7fa v1 o8/s2,uvtaathrough a loop of wire produces what kind of change o1a2o ,fv maocv87 v7svtj/1a un 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 the - ruzqs-jv xgqv /0,5hinducedsj/ vhq5xzv,--0 ugrq $emf$, 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 q:/y rxa d6tw6magnetic 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 directkyci7mj mh,f+ m4 j1q4zgzj;6ion of an induced current in a conductor will be that which tends to produce which of mhf1cgjm7 jm ; +,6qzz4kj4yi 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 taq cd,rs80,p u nm,j7hnble. A bar magnet is held above its center with its p ,n j7s0hdrncu,8m,qnorth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizobr+v yaaga,6v6ks: 5wntal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed 6 w y +vvgkbaa65:ra,sfrom 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 okt i9-t) owz9region where the magnetic field vector points straight up. The magnetic field vanis) 9iz ttwko9o-hes 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 topjw/fa-8ize63 onapu-vht ;g .q 7tdf; in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directioawn 3a;pfht78q/fidu-j ztv-.g6e;on 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 magnetofnao8kxv/g4 0z3;s ric field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction s 0n o/v3;fa8kg4xrzoof the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-inp-lgav :rn)toh 6 s99ay01oq ncreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curre)9-ohl s01 ovqa9n6 tn:agprynt 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 thro66xml6uo nnp-ugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current wio 6xmpln66 -null 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 an axis b:i m-ve1fen5 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 if tn-eib:vefm 15 he 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 i19lbx52 m xf:nv s(ncabout an axis whose direction can be varied. In a region where a uniform magnetic field poin il(:nnxv21sc f59bxm ts straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.xci h7 vyg4b:ht38f -x
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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 k :moqa.;oa h4an $emf$ 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 wkb8hiw)*o zvo*a;z- 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-west direction) is moved ku5x nnf4f;.v2g :ig/ xqlu6onorthward at constant velocity through a magnetic field that points straight down. Make a statement concerning/2n;i6ugk5lgf n : u4x qfv.xo 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 con)crkv.twrq 06 f:rsg:stant 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 trar c5vl w,bim1w *s2-0ad e,fkfnsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequencywmcbsv:( wo 7)yd m,z t.igt+3 of t+,yd itvswmb7:gmtz( ) wo.3c 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 dev pji:):vm-dmyice 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 device t cxqm6lwde8 /(hat

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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 containsnvxcs1e:q44 fh 4ww5 n more loops than the primary coil thq:1v44w4nxs n 5 hecfwen 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 loop0+cf ffzh3og4z 3rk ns-w9qtsa86s kway2: 1fs than the secondary coil then it is 1y0 84qc nws+3off-fzgtaz9wrkfs3 6sk a 2:ha

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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 powem0m) zz.c ygh,bid:f- r 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 circgf+ uy fkhcbvl7c k3g**n5khcnz,)6:uit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cw a7g et*c+*cux 8/(iqlzri k3onstan(i/a 3*clwg7c*+ ix8qrzeu kt t terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series -z n0,,3wbavjd d6q wvto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltadqd-wvv j,z0, 6wna3bge 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/ d3y ue0 6;t,oi.fmc4qvpyhs 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 with inductance L and resistance R is conk58jbwxym-uh:o:hlac 5l9;msjj3 -k nected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batte , jje531igjrrry. The time constant for the circuit represents the time required for the current to rjg 1r irjej5,3each

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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 seri iygteprwuy.8:) jn85l-ck*nes to a battery. The battery is suddenly removed from the circuiw8ye5y pnli .kc r:8g*)tjn-ut. 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 th:ae (lim*tb2snr5g q0e 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 s(es+5wew ty3k .xk f,;7knbfcupply. 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 chqi :z(5xga /xonnected to an AC power supply. In this circuit, the curren/:(xgxqih 5az t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when w 6/7-/qwkwhm72 4pkz qf9e *kh rxzszthe frequency is t7h 2weqkk/z4fh/q97mz- wx6zw s*krpripled?

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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 ind y6x9ramqf ;+uuctor is doubled, the inductive reactaxu9m6yfr +;aqnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acros4z 5 zxje,7nmgmwax1v79j8v zs an inductor approaches zero, the inductive reactze7j mj41859v 7,wxz zgvmnaxance 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. czw : /tz;6d wdln2z2npjf88tIn this circuit, the currentzc8t 2j; l z/d286dnpf:wztnw

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacta8n5 jox 30llxyqy:naey :,ap :nce in an ac circuit changes by what factor when the frequency olpq8 :x,yxa3 yn0a:ney j5:l is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capl; 6uauwp-)elacitilue lu ;a)p6-wve reactance 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 of the inductor and c7dh,zpamfd9mb 1 b*go n/;u9ni1(k gu apacitor in a RLC s1z,d 9 n (;/bufhpm7kbum g9ia1ong*deries 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 cij .nl. i5/3pcih,nnlvrcuit 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. The impedance of the circuit increases if R increases7 5jyokog+x(h r)4-tmuucpg(. When is thgu x - ypth4j)k u7(grc(oom+5is 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 the lbp zr c749,ijs36d-tgsb jw :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. Tx f7gv9ut* unbwy(l2- he impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capaci)4e sc jkrnc;4+(yx*cex gg1 qtance both double in an LRC series circuit, the resosk jcx4yxg +4g)eqcr(ec1 ;*nnant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonb1 b j-85*m lceh,vhux -yx 5vit02jnpance,

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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 RLChzq1yz0 lh 4p4 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 radius 0.10f 8rfuh8w inm(9+xj)d 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 tf9nmr8(djx hu8f )wi+he 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 rotating in a unifor wt/bge-(3kkpa8vz+td a /l.km magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lav/g .tw kbak8/z(3dp -te+kloop 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 37r, ueh wqat5is rotating in a uniform magnetic field of 0.20 r5a h7weu,t3q T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single 8 mjjyb 3*wc 6+slrkw;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 coivnpjd8. e x/7ik)wu4numy z.+l 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 tur3mbbyog,+un vy26r0 5 dv7cl dns of wire on a square frame with sides 18 cm. A uniform 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, fg,v52 +bcm3d d0ol ryvnby76uind 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 tur8rn7f ydi6lh kv-)u6ul f5 y1mx4w1 hrns 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 mcs),o8 ajh7fcdo +llrs :;h7$0.20 \; m^{2}$ 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 horizontbyov7mo,6pvv,t ):3 q bgo6dlally at a location where the downward component of the Earth's magnetic field ism7dg:y vpt, vlq636ob)ov b ,o $6.0 \times 10^{-5} \; T$. 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 angular velo.d kte:l) 7lllcity of 2.0 rad/s about a vertical axis through one of its ends while in a constal.7tdk: lel )lnt 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-sectirh/fkn+p68d n hr/g j7onal 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 10zd5oo2h oj4 m:0 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 rectangular loops on its armatm )xcam0/x) twure. 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 uni0m xmc /)xatw)form magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire+t 0xm iikhbm1 ,wvv09 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 s uijxo//-nq5u.wlhd 7imple AC generator with 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 rotajloinu/ xh / -7uwd.q5ting coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxs;m)w-mo6 k kximum $emf$ 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 motora;odgd6 z7 :ql 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 mot9y )cfwel.,rt or have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fullfe .cr,w9ty )l speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanc4.l tiksks-dk 9n3qk5:9olqy e 6.0 W is connected to a 24-V power supply. The operating currenksn43 ktdk q-59o .ql:lyk9 sit 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 connem1)8kuat oinliw*vb4j ww, ; b7c x:x9cted to a 24-V power supply. The operating current is 1.0 A at full speed. Wwvuk71 mx)x,*ow i8bj tb lca;wi9:n4hat 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 connected to a 24-V powerez4/vl iyr dt: 6bzyb6v e64f( supply. The etdy: ( z 6y6bfrb4zi4l/v6ev operating 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 transfor(b5yd uaw:f0dt sru77a :ea9af(q3 aqmer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14v //b nv:i-gyb+ m+kdtxg4 ce2 A to flow in the secondary. How many turns g:y evgc-t2 bk/ +mx +dnv4i/bare 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 turneca(8,gfvh4vc g 1yhx. z+ o5us are necessary in a 110-V primary if the 24-V secondary has 100 t1fc,+(v xhc5z4 gvoh8 ea.yugurns?

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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 548s /ajxcu3db4ib fq and a 2000-turn secondary coil. If the current in the/bj84 ai4c ufb3q dsx5 secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of v9 x ipgvw4 ylik4pzn47g+pjk3u3v04 a transformer. Assuming 100% efficiency, how many amps at 24 V cpw3 +vgv9 k0pug44j n4pizik x34yvl7an 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 si dil 1z jc4e;e*wp.b4ugn transformer provides 7500 V at 10.0 mA. The primary coil .z;ued 1i wjl e4*4pbcoperates 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 3 nbd(l+b-i0 9dkr0 pjy00 turns on its secondary coil. If 120 V at 2.j b+lbdy pk00(id9- rn0 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 zj b2 jd/(mgqrwdb1;9kip (-bcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to 2j1b;d9q/jgzm(bbwi-prd( k the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tur dnl u:bgb6s5 i :k1+p;9yu7azb ru+xmns. If the input current at the primary is 100 Abkr96x: bmul5nsapyi+ bu + ug7;d1z :, 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 2(*3fnt2irvb umo zh **h5arj 3k0jkp/q: f/qy00 turns. If the input voltage to the prijhu* 3 tjk(fq qko:a*mn3p*hy2frb /zvi/r 0 5mary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its ;b yqtcsxa l t9 li ,5muau+15v/fny3rb3vp ;3secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secon p5y93li33 +ys1 avlcmbx;;u u,at/bt5n vfrqdary 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.w.u0st--8, : w snjwkas:otlz The voltage is usually stepped up to 4500 V by a transformer a.sz:tan,: wk8-wou wj tl0s- snd transmitted through a power line 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 at 120 V. The voltage is usually steppe0,gfjczg9g 7y mt2 g2sd up to 4500 V by a transformer gsg2c mg f0j 7zgy,t29and transmitted through a power 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 g9;te(ss ls8bmd-v/w w jo8y,usually stepped up to 4500 V by a transformer and transmiss ewt ,-w98s(bmj; o/ lvg8dytted through 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 totalb* yu )7ey vut,0evug qzkw,e-mr5t(; 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 percey b5m)et kyg7u0,qe rw,u(u-t;evz v* ntage 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 resistance of 0.60 W. A 2auv.m9 fgc jxg3;:xg 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 original energy iv3:gu2mc .x x;a9fjggs 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 liu8 d:g i v5yd e0ke mb7-h/ve0sn9n1bgne at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of:s1 m gu5keh 0/0b9ndnbe7 gd y-i8evv at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be vs xq,-pyw9*d*oy 9vdtransmitted on a line with resistance of *,yx 9p-9dvsdqyvo*w 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ener2 / vwosku) 9s.cnzkb9gy is stored in the coil's magnetic f.w)k2kscnsb /9 9zuvo ield?

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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. Whatux w6 6wuc9:ts is thi69 tucsw:wu 6xs circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120k97uct :3q vzncg+u6 b 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 i xf3+,pceaa0 as3r u.,z:pnr the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resi ar.nw9zm :*g.2bzuwdwsl ;o*z u2rp/stance of the lamp? 2 m wp;:/ r*ozdwgb92lzaw *rnusz..u

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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 a7 b7h*i1gsjg7hu y4vt 120-V ac power supply. What is the peak currenjhyhv7 b i747t*su1ggt through 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. Wg b7eg6ab.tu, hat is the power dissipated7bg ,6bgta.ue 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 re7q+q incj/we: sistor 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 resistor ;l+,m54mar*azlxn)gcf unusqer ; 7 2is $I = 0.80 \sin (240 t)$. 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 resiq3v4p5qp yx8ustor 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 nqk-twr6u kv.9b5 v 4)aiuhs.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 c u 07j5p. f/nr)v k.hsl.erokxoil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W m5g0ldn gc/q*qd 2i3g4s)2lyg3jfdfof 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 inductive reacq4 lvv*3j5+l swzgdc:tance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 k+ wot:sea)ihqa- 5dwojy-( b/Hz is q-:sih-/awe+b (dty ) 5 wojoaapplied 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 1d -(kh.atbnu 210-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 capacitiv9h9*sootu;yg8lwy , ke 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 5g p,o2- zxd75hq c1kwm0 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 )f3su2rlj 5hk a 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 capacitive reactance of a 0.010-mF capa3*tr;u nj rijf:beb71 citor be 100 W?bj7r3ntr :e u*bfj;i1

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz ab713u epaj21/ai l hy,h/eqttdc5h q,nd 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 serie )kk- ohia7mhtvbn)0 8s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacit hak t-0 m)ob8i7vk)nhive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-u r v)c,u3 )od-k9*l /uypuovsmF capacitor are connected in series)u u v-c3 dpru ko)v,uy9/*sol?

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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-mz 9aqv(1nba.i H coil, and 1.0-mF capacitor are conne nav a.i(q19zbcted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-m -rjx, s;pg*ulH inductor, what is the impedance at 1000 Hlx;u sr *-p,jgz?

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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 con hvv,yk-xv+:b qss3rqg,* y:a nected in series with a 20-mH inductor, what is the ph:3yy, sbahq +-k:vrg,*vqxsv ase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 2hlrc9 * y u(hkpk1 3o+t(4jmhj0-mH coil and 1.0-mF capacitor for a total impedance of 10u1 49k (jc*oj(r + hpmkht3hyl0 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 ihbuhfw li)f2b z(m3 w jmz6b. c2.+)pfs needed in series with a 100-W resistor and 15-mmjfu))c wbfwlm3+( b zhh.ib22p.z6f H coil 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 inductor at4b5vj,u- dbkat lt -5 vb.jiw) 5000 Hz for a total impedance of 400u-i )tv vbdj labjk5,-wt54.b 00 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-MHz fo/o7 ohml 4c0+4ovkt aph cbz+4r a total impedance4 oh7o/lcotz40+hvb+pkc4 am 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 2j,xj6 ,j r:9lcazt1qy4 u; ron0-mF capacitor. What is the impedance at 1000 Hzrc nrz1t:axoy ,j;u l6j9,q 4j?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need*dn qr)ixp 60bqj; nx.ed in series with a 10-mF capacitor at 1.0 kHz for a total impr.di;6nq0 *n bqp)x xjedance 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 winm88z kckc **cth a 10-mF capacitor at 1.0 kHz for a phase8zckck * *c8nm 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 seried4,4ltrzqcvm2v0+17tvzimj s with a 30-W resistor at 1.0 kHz for a total impedancrzv4t,i0lqv4 z+mtj cv7d21me of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120;+oga6 n g;d;g9vpuak Hz. What is the phase ;na;g a;+vkgdgo9pu6 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 150 v9xrq2l)b9 nm. t8idslvuu ln*i03-l0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF xdnilv v* ul99n8lb2t.ri3s lq m)u0-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 ;ja, 5rddv( jxconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hjddxa jv ;,5(rz 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 induck ,k5(p;98cgiqdp cdu tor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power soup5 p gkdqiu(c9,8k;dcrce. 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 circur9mko: 2v)ln8tv.fs dit containing a 50-W resistor, a 10-mF capacitor, ands2mr.8ofk) t ndv9lv: a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle o; 15h 1ci7ya2 q5li 6wdibhyhuf q 16;hdu h5iw1i2 lby7ihca5y $40^{\circ}$ 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, L3vzhds7u 0,g n = 200-mH, C = 10.0 mF. At what frequency should the c,nu3 d0zhsg7vircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 *l xtvjri(/ok 3amdc+b1+ a2nW inductive reactance, and 10.0 W capacitive reactance, w dl jm3rbtx+k /vc*aoani(+12hen 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 ,.3w-lvo: e c0 3pbx;pvkzmbnAC 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 8gw4 n;i.xc r2a+uljgan impedance of 60 W and a resistance of 30 W. What is thua.xc8w gr 2;jn4igl+e 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 contaiq s(xq9b swcq)q t04 6azpd*;yning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducq wdyp)zs9a4s6xtc q0q(;*qb tor, 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 capacitor and a 15-mHyv*xw,l(t j(05vh rzo coil in series?(r o0*tvwzvlx( ,j y5h

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needeow2:0y sd q fos5aj :r:moc09bd in series with a 4.7-mF capacitor for a resonant frequency of 10o9 r0ob5:w:o2mqc sj s0a df:y 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 nee.x16mtcyqmzp )h,sf 7ded in series with a 3.7-mH inductor for a resonant frequet) .7z 6fsqhmcm1, yxpncy 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 resist 0kajjk 6-(wjkor and a 40-mH coil if the resonant frequency ofja kk-k0(wjj 6 the circuit is to be 1000 Hz?

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