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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 a-: kd3jv lwyb0re 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 statexyie 1395 ksegs 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 wiroz,v;4ekx,fhlm 9qwnz0l km1t.ky+ s92q mj+ e in a coil produces what kind of change on tjtq w e4v02, 9 z,kksh+zqf mm+lny.1ok;xl9mhe 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 throuxd-; kyjj+3tx,k( l2 v sc(rwqgh a loop of wire produces what kind of t 2 ;d kvjsjy-,c3rk+l(wx(xqchange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire proy afw5szj :.k+duces what kind of change on the induce+ wa5k j:fys.zd $emf$, 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 fromqrdrc1+vv4)l ju /1ljo;qf )l a magnetic 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, then 26l9zk;5ijul lj3mx direction of an induced current in a conductor will be that which tends to produn5kl;j j96l3mui2z lx ce 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 )s2;qa9aanz1e mzx4t8 (q.5mew ts zl a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewezelx . a(w nqsaatt 45)m; zmz18e9s2qd 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 magnet9ba g j4xw; hek/vac(htk14-b is held above its center with its north pole pointing down, and releax vk(hw gj-bcet4a4 hk/1b9;ased. 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 magnru8y q /. pp7f0r odri-c.pu8fetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currdyf 8/ r.uo-p icrpup7rf.q 08ent 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 r pip-0phc5wd8 mre b;e3:b; ea region where the magnetic field vector points 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 fieldpmeh; rpriwd;b:30e p8-c5eb 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 wfpnn:*dgsmzc*h+* x/)aj j x-here the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappexpdjn fnzh: *jx +/sgm*a-* )cars?

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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-i4lmax vro7t;+ ncreasing current northward. Two coils of wire lie flat on the table, one on either side of vmlot74 a+r ;xthe 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 4luqc/qvtu +zv-:ok+c6f 3yy 5 f1knj loop of wire with the north pole entering first. As the north pole enters the wire, the induced 6j1+qoyucvf ql3:z k4cvy nf5+k-t/ucurrent 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 w,7hlvd /og/x rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must bvhw,d g7/l/ox e 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 axis whos j9dmt- nzn04le direction can be varied. In a region where a uniform magnetic field points straight down, whatd09nmj z -lnt4 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. b -jffjrfe* h1 ;e6yp*bl.5lm
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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 thyunbvm/f / d)* 1vtcwc1/lmx4at 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 magnet 7l0-o xka;dfyo02dnsic 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 t.flp2chz,p ,v he east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pofc,p 2h .,pzlvtential 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 angular vajuu0nf(0(.he e(x wtelocity $\omega$ 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 transb9d/49s.sbmi x h. cceforms

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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 re7eio)ku2g w3uyy z.dh+;ite( 4feb3q w0uo2 vvolutions each second. The frequency of the ev)tuq7u ub322wzw; 0dy ogo4(eie+i. k3yfh$emf$ 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 dovoy/w*/ z9 w4k lbac8evice 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 tuwxhxcajy h yu;9wudt9.,c - *ox6;atc r5(5bhat

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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 loops7-b:qbylu4s:f jb;o s than the primary coil then it ibfl:uy:bqo 7s- sb4;js 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 thz 0-a- uzzl6ugs :o-vae primary coil contains more loops than the secondary coil zzg- azo a6-0uuvs-: lthen 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 inputc ke4m5b4 epqqlb4:3 z

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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 circuwhpkk63/-y83z czo0zm+f nk jit,

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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 toyxnf::t6y.e jzq 1-ri an ideal battery of constant terminal voltage. At the moment ci-qy.n z16yr fe:tjx:ontact 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 ideal bat jewf9w3 n/tl*tery of constant terminal voltagwj*lwe nft /93e. 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 resis + c5+hj1ggrhe): gco.wre b8dtance 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 iss)3fvhwpr 4w imr 6cg842fd k+ connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a iv ik .d.hux8,m+y9j ebattery. The time constant for the circuit represents the time required for the curke. +iy,ivxh8ujd9 . mrent 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 baz-kr2gdfl. mg +7r 0crttery. The battery is suddenly removefg7+2kc.0l dgrm zrr -d from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uni 0kw7p)6 r o*x(cc2yp kk1itdsts 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. cdd41l 90ez42*y5wtcyi* xla+bboqtOn 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 connected to an A6cwo.hfz.1r q C power supply. In this circuit, the currenq.c 6.fw1zo rht

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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 b p d4t,t.m0trcircuit changes by what factor when the frequency is tridt.m trpt4,b 0pled?

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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*cev 3vum7ed,x;i/ms an inductor is doubled, the inductive reactance vud c;*m,3me /six 7evof 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 across 9) h0 5.cc qng6uvg *j;fttnxsan inductor approaches zero, the inductive reactance of tha6xtf50;chc.utj n) 9gsqgn*vt 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 mpy--;/pn.:myae w( gadmsi;an AC power supply. In this circuit, the current d -a(mm:;.m s/yyainep-pwg;

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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 circhov mz9y 90nk7uit changes by what factor when the frequency is tripk mnohz099 7yvled?

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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 acroszmd dejwu 4 2,g*+ms4ls a capacitor approaches zero, the capacitive reactance of that capac4e+ms*4dmud wj, zlg2itor

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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 cax w8xou-lz+ ;lpacitor in a RLC ser-xzwo+ uxl8l;ies 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 a s5wg/wh*ur :un RLC circuit 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. Thejpx(2 1u6xp nl impedance of the circuit increases if R increases. When isj u21p6xxl(np this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The9hxdr ltt(w.ooq7 xjyy)a-t;62z 1eh 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. fg f-6x;jt3:jc:dsh . h;rpxc The 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 capacitance both double in an LRC series circuit,myo2j -zx77we the resonant frequency of that circuit7wyox m7j2z-e 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 res4(a y0z/2qxou fgjgo*onance,

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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 R(w8 0of:t)x m:yfwd jmLC 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 0.10 m is rotating dn p8l )mu0 u2aiavl- z6-b2gp)xd7vdin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic i d)2xz uua0blvm6dl2-)pvd- 7npag 8field 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 v3qr7 sbl,ay 5magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpen vla 3brs,5y7qdicular.

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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 fr i-.r8vssgs ( i*fmu:ield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angler(v:fumig srsi s.-*8 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 reduced fromj7eln1g--. d+lo2p 9wqe aby t $1.0 \; m^{2}$ 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 change.5bb4adfd.wvdt:m a71y ut0rs from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame vl( tahwkeil 5pd 80ft.l;cw530dpfn y9r*6i with sides 18 cm. A uniform magnetic field is av d98tfl0hf5an;wl ielt5*p rp0idw .36yk (cpplied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wirhu3t( 5yhtsb+/zlw w.g)r vn5 e with 15 turns 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 3+kf u9ra ait7$0.20 \; m^{2}$ 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 h)9ggxcylz7 w*orizontally at a location where the downward component of the Earx 9y7)lwc g*gzth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant /1kk dd,7 *b8h zxez41olm wqpangular velocity of 2.0 rad/s about a vertical axis throwdkl4z*7mxez o /8 k1b hp,d1qugh 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 a gpuddql 2-*r)/r+yx cnd 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 1j ttwbys/z +ig3x (dto;;-*8nrrb9pw00 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 armature. zh lcn6t,hwqb*,k4k2r 6 no1 w 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 c1z, n6 olwn*4bkhtkhq6r ,2 wa 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 of w,x4t8:nd1 op;m vln7 5aly xsuire 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 wits*e;l 1n;mr/ + dp5tgj2rn jn:kxv,gqh an output of 12 V maximum when rotated atx;m:r + *npg sj dje2nknlgvtq,r1 /;5 60 Hz. A magnetic field of 0.050 T is available. If the area 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 generatoriuz)ibeyw e84;bns 6k0e .i2 ro/hph) 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 mpinmpa a0f7)5otor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The rd ql -v/-w tve-j,zyi1ss +e-motor operates on 120 V AC, and when running at jt qe/dz+ yvrv-,l-i s-w 1es-full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V p+uk e 7nypg)z7ower supply. The operating current is 1.0 A. What is the start-up curr ne+kup)77y zgent?

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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 nt29 sp+vs(mv*qjh gm ,co(n..0 W is connected to a 24-V power supply. The operat(pq+vm (jvs,sn2*otg nh. mc9ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance lmlt ayeny6 y0)g9j8) 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ba)en0 jal9g ly 8mty)6yck $emf$ 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 transforme)3x:xoz ;rcrb dpsv4 qrgm8br*)59sedw:a u 5r 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 14 A to flokvdgj7fn8 6 n-w in the secondary. How many turnn v6-8dk ng7fjs 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 1h9ut f, zhd)sare necessary in a 110-V primary if the 24-V secondaryhs), 9t huf1zd has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondarn( .l l-0,jpoj64okic gguaq1y coil. If the current in the seclooi1 46-,qugl0(jnack gpj .ondary 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 a tran/sdyr54g/1wcte0fse , )nk z *m;bsrm sformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secowt1b /r)e*se/mmzfnks5 ds4ryc,g; 0ndary?

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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 transfor:epw n0tmxav- 6mv1/c)vd xq4 mer provides 7500 V at 10.0 mA. The primary coil operates on 120 V6vnq m 4)ecwmp0x d:ax1v/vt- . 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 p w u.5igp-sbh,rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied,pubis- h.g w5 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 3hw7a e; 1, bpaxrd d+o.(ni(pf00 turns on its secondary coil. If 120 V at 2.0 A 7o.ph p( (+bd,n f1iwadxer;a is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a traay+r.x;u d;et nsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpu;eu ty.rxd;+a t 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+0cq1 waxsn.ql2yy /p 100 turns and its secondary has 200 turns. If the input volt+ a1 2c.0wlpqx yysnq/age to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconda;2vzzk(hk*zhobu/ i 6 ry has 200 turns. If the power input to the primary is 100 W, we can expect the power outkh 2i;*zuz zkvbho6/(put 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 is usually stepped u1lb -:kfdk ytp1;py (op to 4500 V by a transformer anfp1o: ydt pk;k1b- yl(d 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 vuc6v/ 3pxqve+06l vmyw37fpezxc8;uoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentag;3y f 6 ulxcvwme 8z0up 6q37/ev+xcpve 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 ka65,k5grg nxn2ehw d o2-. byof current at 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 percb,k-hynanrd 6xe5 go.2 k5 wg2entage 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 to7f//c m p4 gx:tiau/u 6kn ryl6dsu55etal 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 percen6 5r 6 u7n/pg5dsa/xu:iy / euf4clmtktage 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 hjem-dh5h ks5i(i w6vf,6ht *50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy vfhh6 w ij*5h6( -hk,imes5dt is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would 4aq l6bwzll x/,) zun1be lost if tzx,41l w6 zl qu)a/nlbhe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted7 -xrt+i pi1,mvz.t9gd -(wsq t yw-op on a line with resistance of 0.60 W. To what voltage must the generator output be stepped upo yst9t+q-prd-iwx z.g 1v7(wmpi-,t 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 energy is stored in the c , akx1k qkp57o+bplp9oil'sq1a9 , p blkp7+xopkk5 magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistorwv/u(lm9p7ha7.i xsj and an 18-H inductor. What is this circuit's tivu.7 h xm(j apiwl7s9/me 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 kwc *j4fm n/t.AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120v8n j3p*mbklx0;ds p1 -V AC 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 120-V AC outlet. What is t( twei6 r53gu h7-tnwxhe resistance of the lamp5 w rn3w7i-t hx(6gtue?

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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 connectedsex i2mc9-auxc/ f5 vc76noo/;ekl-i to a 120-V ac power supply. What is the peak current through the re-i/cx e 6-xn moic9su/ koav5 7cle2;fsistor?

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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 isc xwh4e7qw5l+ the power dissipated in the resisto 5ewlhx4w7cq +r?

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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-Whghe x/:,.r sm resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through acc *jd+zlttfi5wfv3/w .2 7ey 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resil7t,he)h8yy igyn) ; 0h+p38o ic iwaastor 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:gn4kr: w ny4d 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 2crh*y4zjy27k x 0ld c3.50-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 14.0 W of gj/m/7htgdsh3l6;eqsux868th 0g93sx kbhqinductive 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 nes4; (+4d ksiksvg,v/t 4txztg cessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60- n9i197uouwa nmH inductor when 120 V AC at a frequency of 20 kHz is applied to 7u9nw9nu o1ai it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hrd al0qh*1jiq4si o6( z 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 a 9q/kx iydqwj7 e0b+,vt 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 need-1c a+ysg:xynn4 ie:l ed 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 capacitoryysnh , ,eufk4(3my-jy 9; uys 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 7 +rm1yd:mr.5yfuc n sa 0.010-mF capacitor be 100 Wd+ .m c5urfmy:7r1n sy?

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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.eah1ph:en( pu(+t4 kn 0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac 8bth-wt8sw. hi4e5f hbnu b6 s63ff(x series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reaf 68f(b.hbwh5w nbf-4xs 6hts8e3i ut ctance?

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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 impexk1; xjd,,u1 suw*yc qdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF 1,duu,j*wqs xxk1;cycapacitor 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-mH coil, and p9+8y,ynfp fj /;r ;wk1fq wkb1.0-mF capacitor are fy+ ff8k9jn/p, wy1wkbq; r; pconnected 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 -) w+ra6ar6da1dewk.mokdv 5inductor, what is the imaedv r )wdm+15 krd-akwa6.o6pedance 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 2scaz; w*ty;l)q*ac82w +cer a0-mH inductor, what is the phase ra*a; ccw2z + *s;law)qtye8c 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 circuoakj v96w+bx6 ie d2pc1pat9 ;it with a 20-mH coil and 1.0-mF capacitor for a total xp2t9dc91j 6 oapw ;ikev ab+6impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 9/8o cyj56c4g.kc 7lsvnkctk100-W resistor and 15-mH coil to get a total impen6/cocy 9lt.jkck7s cvk58 g4dance 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-mHo iwkq4e j,i7f/qu-8r inductor at 5000 Hz for a total impedance of 4000-8 ioj4w/rq7u ik fqe,0 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 resisto ck.:t)bpulu6oswfe 43hi: g87r-j hbr at 1.0-MHz for a total impedance olkhi 7e)urb:8:whu46 tsgbj.cfo3 p -f 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 connectede b1l;.qyi92 jc(f y/pfc(xuv in series with a 20-mF capacitor. What is the impedance at 1;xf(cfy9(vbil qp/y.cu1 2 ej000 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 rj9;u:vtu-n kwith a 10-mF capacitor at 1.0 kHz for a total9 :n -tkuru;jv impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede:e7j m-x lb3nyd in series with a 10-mF capacitor at 1.0 kHz for a phase angle:b7 lx 3nyem-j of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W z 6.ongod-;v-abvh j) resistor at 1.0 kHz for a total impedance ofo )gh- vajv;dobn-z.6 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 capaci, j)* -co9hugot3i fgktor at 120 Hz. What is the phase angf-9 ,c*oktj)oi3 hggule?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, al9kpasf : +n*pnd 1.0-mF capacitor are connectelpp:9fk n*s a+d 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 consizo 3gb m *wtt,w41fg+qsts 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-Hz power supply. What is the rms cuf*1+tmzowg3 4w ,gtbqrrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capa, x:i(zyt. fxtwsc*o s5sj)yfou7./vcitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows inyf7s :fsc /z.*,sow( o xjttxyvui.)5 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 re gs+gndmw5r8e.6 cqjo.yue 74sistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tg.s8ne7eyrw 65qcod 4+.gjumo 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 serh02 +pgfwsvuk 4v c(tb n;t:y9ies with a 500-W resistor for a phase angle of:k ;ht s0cp 9bvg(fuv2 ywnt+4 $40^{\circ}$ 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. At what freq+sj1b0t/ 7az45qysfc z y0ez;o msv e3uency should the circuit be driven in ordcz0 s 1 yz0s7;eebq z5 s34aym/+vofjter 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 ref-j* x: )qz;buxnxzb +sistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance): fxqzjb;+ux xnb-z*, 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 A/;m.rgr2sh9 nfzt sce6lm ,(gC 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 oflf;b8ccr4 ecpe axp8qb, s 5 2+;k(ccg 60 W and a resistance of 30 W. What is the power factorc(r8,kxc;e;p5 b+2sg4cfqb8 epcl ca?

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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 fc4b22rmk y3ff1l6lgxwp t4v )or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ind6224ptr3w4 b lm )k vfgflyx1cuctor, 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 capacitoke2sq oe0qtq:6h00e g r and a 15-mH coil in series?:ek 20 6t0 0geseqqoqh

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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 capacitor for a resonant1bc5 + rk1xo3rfh er5q frequxrr3kf1 bc1+reo 5 hq5ency 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 for a resona:g ok16sh h7mxnt frequency of 1000 1og xs:m7 hh6kHz?

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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 irki0k4u ks4wd2)) vtpn series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit0t)kuvw) p4ks2r4kid is to be 1000 Hz?

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