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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 nr;xg 7j/mxq s8) w ci3(p2slqof 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 indttk /jc(zv sqg7;/j,asnj *l4uction 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 coilsu ru4k 92z1kfz *l,hy produces what kind of change on t z4krlh1uku,9*y s2f zhe 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 thro - mmwqic1a6jj 4/ud)bugh a loop of wire produces what kind of change mibj-dj 46) a/qm c1uwon 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 tstit+)ht8pkr2 ** sf 3ghg;ginducept *t*+s2)g 8;rh sh3kf tggtid $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field vy*1eaxyh c11r ;e3h 9jng/p*q 4csgvan $emf$ 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 induc7flt2urt36 1p )un(agdu1 twzed current in a conductor will be that which tends to producewurt ant11u p26dl)t fzg3u7( 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 nfq*j o/m9.nh s a3k1f(qulf,flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationa,9 u3 nlja(/*qn kfsf1mhqfo .ry magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abol ne(b 3v/mp2zyuyhb6/0ew*4p/v dj nve its center with its north pole pointing down, and released.3v*/(6 v b bem/0py denwz2pn4l h/ujy As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vecto jd 75 myc:8rwwx*mbg0r points straight up. The magnetic field vanishes suddenly. When vdb:r5 m ww87*jcmgyx0iewed 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 t d+bsy51u; ca+v1noz j1v w8;meh-mtuop in a region where the magnetic field vector points straight up. The magnetic field s j1e+ntvma5wdo ;1s-mh 81 uz;u byv+cuddenly 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 *4 os kal65b)0rl 5fzrk,vpvjhorizontal table top in a region where the magnetic field points straigl k4)5z5fvb 0 arovlrsk,j p6*ht down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an everj4q*3a gdm/cosz h -4z-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whe 4o3ha*-d4zgcs/z jqm n 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 looqh +y 0t6y9 4rk;lj/tf dxuy:hp of wire with the north pole entering first. As the north pole entr f +d yj;yqh6t9h l/tk4u0:xyers the 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 rotated at constant angular speed about an axis whosews a92pi 6x v7m;qayh* direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tqxam76iw*sap 2 9 v;hyhe 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 axis whouhba*g 4.+v4 7vroso, ;h swxise 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 rotationv gh.vh4*s74boa osx;, uri+w 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.-nnm )dbfzpx; .)8 gla
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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;rta6x 9dmha 1n:t3 op 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 magnetic field. gum+0cx 8ox-e -z13x./nha ordz;omy 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 northward ;ftyx:1 u -tgy c;bxxtp5+ed -at constant velbt ce py;x-+1duy:;fxtx5-gtocity 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 constane2;iwtg xa wmns k;-2hkge4.6t 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 generator1 jm lj:qu ie(l3r 7jiw:rie44 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 through 60 revolutions each second. The frequencyzy,8 pmtqg4g:o y;j. p of the pmo 8;yz:yg.gq4ptj, $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used touq5a.dci0+mzggp9 *s

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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 devicp*0m5 jlp ejr*q)jhufc.uz/(e 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 primary couh6 4:7kf ymg3w.idjj: nz c2oil 3 yhu2oz.wjgnk4 d6 c:mf7j:i 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 thcrmgvj*xrl0 z)anjy 0d 7-;p* an the secondary coil then it - 0dv y70 gcja*zlrpjrm x)n;*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 po0 )/.7mt: ojsepevom nwer 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 resonantrl82 9 qqptr mf00yg8l0suku 4pk/h;a circuit,

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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 conn e6xkm(hvii 4d -z*0/;r ybwfoected in series to an ideal battery of constant terminal vov;-kide04/ z o(fmb yxr6wih* ltage. 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 to an o fs/8,) smuhh+(lb/txn qo-k ideal battery of constant terminal voltage.hoqsfu o8/ +xhk/,lbn t) (sm- At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resib, cyt*g)dsi623m;tw v sfi5nstance 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 conh8w 4h0q()m*jktlixfnected 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 ba-5qx/m0cakw1kk;fxi e l,qv)ttery. The time constant for the circuit represents the time required qw-am;,1f /k qc0)kk xliev5xfor 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 seriesvi8,nkus;qx8vqx)ub 5 tpu -47a4juy to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requirtqa,q x8ku x5- 7j u;in8)p4b4v suyuved 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 hau8(w yq7( epexve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thit7 03cihocdhh s( *e9vs 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 7b8 9 fwj/rm64jdd uez+3iibbto an AC power supply. In this circuit, the currentb9uib 3 f+ wj6jz der/b4m8id7

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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 wh 9kbd9wba:sjoi ,,r0 , yj4 f.ygq:ohwat factor when the frequencikfbg9wy:a: 0 qowh49s j brd,jo,., yy is 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 lha5 l*) pf.ibq*1qmr the AC voltage across an inductor is doubled, the inductive reactance of that inductoap*h) q. 5b1*llqrmf ir

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, theiwlp.iky 2--jk ev(4w inductive reactance of that coili-lj (e-kkyw 4.2wv pi

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this d1s (ivorrq:fkp/f5d. a*gd(circuit, the currentokr *v1dgfdfs.i/ ap(r5:(q d

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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 bycj7sg oa(2 m4g what factor when the frequency ic7jms2g (4oags 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 cyd+ sg+p2v)evqdq )j1apacitiv2 1pq) +sdvjqdye+)v ge 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 vy1n v:*n.hj fi5pmh+ zoltages of the inductor and capacitor in a RLC seriesihyn fj.*pv+ n1z:5mh 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 defined(2brm mmva0ts;j+x 9z4kr+ fu 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 ;3huw q0qcd7h of the circuit increases if R increases. When is this statement tru c wuh073hdq;qe?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circu -mdrnsucwe1:;18 x muit. 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 circuit increases peid) na bqq3,66 q)vwdsv29:iyee1;rf y fm+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 doubl1znjl/z+ r6jhyx.w:zz +z9 b be in an LRC series circuit, the res9zjxb/ + w:rlh+j .ny1bzz6zzonant 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 resono3l 853qpo qrkance,

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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 circu j-dvfpii -0r(it 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 x*)5pl:pp7o / mjgcvz magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fig jz7/ povpxcm*p:5l)eld 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 uniform magnet 9bia9sh h8k4dic field of 0.20 T. Find the magnetic fsia 8h9 kh94bdlux 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 un9xofcw/c* 8 tuiform magnetic field of 0.20 T. Find the magnetic flux through the loop when thw*tco98fx/cu e 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 adjrw3 j2 ttqc-y-.epx2c ustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fromk;(a g0e6xi zgl.,:qbsb/r xdida:/k $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sideschzf/3 f5 k;,6 izq45q zedfpuc ooc+7 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 ;i/fo kcqzcezc534q, +p6uzfh5o df70 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 andm wm c;hrw6nta47i /9 gynl:a( 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 areai-rzen ad7k ,9 $0.20 \; m^{2}$ 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 horizontall qa1klt/u02o ly at a location where the downward component of thq ut 1ak/2llo0e Earth'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 baor4 -iy zn2+tj54pw kfr that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/jw4yo+ 2i4-ztpk n r5fs 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 l7m0 4d.7latdar5 ;a :llrqikuoops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area 1( zpo1tpsu.t$0.090 \; m^{2}$ 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 rectangulac)1bzfg 7 cy1br 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 1 yb7)bczgc1frotates 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 100 turns ojby)9r+qw 2nt* rv2hpp2t8/tkn -fuxf 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 gca.0j+ q) ctqwvx 3/kz4bc1frenerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the arec1bx r)v w f/ 34+.ckzjqac0qta of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatoro; kndkk2 :h8t5z7j we 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 hanpbbl:rq)w 4:ve 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 db s6wa3 :e65x7uavrf resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba3 ab 6:wd6 a5rufx7evsck $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power 5rhz 81u4( ge/jxgbj osupply. The obxjeo j /8z(gr45 u1hgperating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pow -6 h2s esnxqh2v+9svxer supply. The operating current is 1.0 A at full speed. 6xsvhsh9es2nv+ -qx2 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 connected to a 24-V pl60 sc(6t + v :c-zg4igkaozdhower supply. The operating current is 1.0 A at fus l+c06gog-a ktv: z6ch(4izd ll 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 transformerb r+,l, ;gzrwh 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 o3xdcg;r4 c 0e-v)q -utw8ssftf a transformer causes 14 A to flow in the secondary. How many turns-ecgsurtfx -;w)43 0d sv qct8 are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110- 2kui+; mgem4eggue 3b)cnv90; aez6a V primary if the 24-V sec3en+6 me)uba ; g zugg0k9e4c2me; iavondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of /()mcyxd1b ) tih*f jga 500-turn primary coil and a 2000-turn secondary coil. i jc)tm )fhd/b*(gy x1If the current in the 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 thj+oshf sgnzd./r;+t2 e primary of a transformer. Assuming 100% efficiency, how man oz2.tj;hrds++sf / gny 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 7500 V at 10.0pi0yx pbw5h3ddq6r 3:jx n jb1nz249n mA. The primary coil operates on 120 V. What does the primary draw?hn34dqn xd2:bj6x 1 jp5p0wn9bi zy3r

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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 itn2)1vrm -s52 r0 zrkzl9bg:cidbw: y wnlu7) qs primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prcby) 72 zlil g1zkrubqr:rm 2wvn: 9s 5)0wn-dimary, 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 ong577cndxc bv6* zq x*g its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curreg zgdbcq7xvx* c 5n6*7nt 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 10id2nr.)/ o gwswiyn);jv;j 9 e0 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curr9e)ingn)ji.v ysoww2;j /;rdent 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 turns. Ifbk;fr(, p.42*hoel csxnzb t 4 thfo,.sc (4etbrkzx bl2 n* ;4hpe input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tra 5ju chx6n,,munsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 15,6 jh,nxumc u00 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is4 8r9 2yn f7rccucjhb1 usually stepped up to 4500 V by a transformer and transmitted through a power4b1ryc rnjfc9 278uc h 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 rorw;- 1/txs hvoltage is usually stepped up to 4500;x rw/t1hs o-r V by a transformer and 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 is4,hk*+pz x5htgb nkd6 usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmi, +45pgh kkxdnzhb 6t*ssion line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resista1b5pc:u aj1gemckb- )nce 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 the5amg) bk1 c-1ec pjub: 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 liwz.qwh (*a mrqg7:e5 tne 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 t w:(t*57wqz g.meqr hahe 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 transmittey vk8(*4is:5pqy co ubd down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 30upobqi(8 s k*5vycy4 :00 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line 7 33tmi 7hbxrkxn:f17s sgtb. with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in tssh it.gtb3:n1r7 77f xkx3bmransmission 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. b:-u smsqc,bs0y6e 5ownl* g2 How much energy is stored in the coil'sys2uco 0 -b e g,wb6sslq*:n5m magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6xz,t hjsr 9onr 94fc+0.0-W resistor and an 18-H inductor. What is this circuit's time conjsh,r40x c9otzfn9 +r stant?

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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 12 .wvyn bq 5/.ar/xko3w0 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 outlcm( 8k5w. qku:z*vrvbet. 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 7 uco)mz /nh45obr7 8zx3zvq/jpjuv *a 120-V AC outlet. What is the resistance of the lamp?u/qj7h cx 5nz34omv pj/o*8 zb7urz)v

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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 connmk a(jn)hu. 5j55drkz ected to a 120-V ac power supply. What is the peak current through the resim(z a5)dkkuj5rjh 5 n.stor?

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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 16 /ek (w4geubx3z mv:e20-V ac power supply. What is the power dissipated in the xkm(e6bzue4 ve3w/ g: 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 resissq yprwz7d9q u(u2ap* ks94x+tor 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 +,6(uvfgk2mt(llkk fy m:5vi50-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 resistor hmu)u9 /nt d(*wg2 wntis $I = 0.80 \sin (240 t)$. 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-f e. i9/ix(fojg 95/c k4cnxvemH inductor 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 1k qh*7ec2e:re)dod n ,000 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.e nxy:8zw -bt,0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz?: t fw,n+1rq (mitsiu+

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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 iw4:bazgl *ah67iosz; nductor when 120 V AC at a frequency of 20 kHz is applw6h z:o4;a*zb7saig lied 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 th.(l m llrzkz.cbq;,) jrough a 2.50-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 1ln8 g5,1x:ds)irvo6eh fyr) v0 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 neededy q;4yn fb+k)v,x 3yzd*:rdyc to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200p /* ejd;*lhia-zwe +f 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-mepd-f*da ,ils +*b:n tr9 c2yi:lmmq.F capacitor be 100 W?ddtc,2 ny:a.*lmfms9 :+ i -re*bplq i

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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 and 5.04wx1:/bwb01/s8n nmlg+ jvvd r (rqg n 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 (86w4n 30nx3ykdvcav v)vk b w12.0 W resistance, 15.0 W inductive re vn 6w0 wk8vdk4 3cn(ab3)vvxyactance, 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 v,/ fixcoh-7uat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac,/f-iv 7ou xhcitor 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 1500 Hz if a 100-W resistor, 20/e yzn a jnl71*ypm0u:-mH coil, and 1.0-mF ca*0ujeyp1nnzl7 y:a m/pacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductog1 . zgvrdi-:vr, what is the impe.ri dg:v- gvz1dance 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 9v9:r-d+n69 2v0r /wydnknqg v+ha b2xpu ebuis connected in series with a 20-mH inductor, what is the pn6rw90bvve du9+a y2pnh/x nr9u vdg:b q-2+khase 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 20-mH coil and /n(4pkyvv+yu-enq od-s,qp lo/6np 41.0-mF capacitor for a total impedance of 100 W at k/u4le+ / ,(dnoo vpp-yy qn vqn46-ps1500 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*.n6hmotk mi; needed in series with a 100-W resistor and 15-mH coil to get a total impedktnm i m;h6o*.ance 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 withp s9ybv0z,3bh a 450-mH inductor at 5000 Hz for a total y, 3sv0bzhb9pimpedance 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 put in series with a 100-kW resistor atv7m5 chk*1m xc 1.0-MHz for a total impedance of 150c5mxk 71mc vh* 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 capa xf3u. o,lsg))o0cjf;lete t,citor. What is the impedgtfuj, ,s foteo.)0ecl 3)xl;ance 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 needet+d9 nrs+iyll7p q.u gpivs/98r:a 9ud in series with a 10-mF capacitor at 1.0 kHz for a total impedn/ uls89d iu r i gqpal7y++r9p9:.svtance 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 wit/dplbva.4zz ,h a 10-mF capacitor at 1.0 kHz for a phase angle of/4. lad zbzp,v $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neow 9 yymuz;.2deded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45o;m wzuy.d29y 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 , a ,u0wx.wro .jddc :1uyokd:with a 100-mF capacitor at 120 Hz. What is the phase angle?0 o.radud yxwoj:,kw:dc, u .1

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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 1xps1*a7 ;6ivuqmf8op 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoq ;6xvfa p1oi pm78us*r 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 resistor, a 10.0-mF capacitor, rak iemmg: y()hi. ;v-and a 0.350-Hgr; ayv( im)-:ie .hkm inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W,uad ,8f: qtjw, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz po dwq,u t8:,afjwer 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 containing a 50-W resistor, a 1f b osifwjlg*,w 8;.m1zw. 7dt0-mF capacitor, and wzd;wo sj wlgimbf. .*tf1,78a 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 n k9x kwcwrl),.p9wm+aecessary in series with a 500-W resistor for a phase angle of kwaw.9 crx ,k wl9p)+m$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. Ate1ka/z h 8cr+r what frequency should the circuit be driven in order to have maximum po+1e8h ck r/rzawer 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 a6+y wbz ;9jionc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, + ywi; n6jzbo9when 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 A bd 3l2,sw8buac byj-;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 Wusk ;s q/o:z9-uph- nt. What is the poup9h:-quso/n ts-; zkwer 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 ;kpqte .es.p)9rc(e/i8j2fx ksosq 3 containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induxo. sfcp.t8e9s i) ep; r2s(/j ke3kqqctor, 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-mH coil2ff hi z,-hx6e in series?,f6hx2 fh- iez

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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 cj e d6y(+.mlay8hd.ga 4.7-mF capacitor for a resonant frequency of 10 kHm gdjhlc. +y6.a(ed8y z?

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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 inuv o0y63nlm,x series with a 3.7-mH inductor for a resonant frequency ofl3y nmu ,o60xv 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 resisltzvuccvw a,6 ,q-m5k w-6vp 6 1kko:ktor and a 40-mH coil ic6kvt ouk6,l m zpwkavkqw,65:v- c1- f the resonant frequency of the circuit is to be 1000 Hz?

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