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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exi0wdhko2zb68 cept

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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 2)qs .vxb n(kbthat 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 wirerf0cuo r 9w4q4 in a coil produces what kind of change on the iuwq4 0rf4 o9rcnduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of8k(-2:djba6 k cy yoo 9cssm;d wire produces what kind of change on the j(;9 a:dkbm-sy2sdkc6y oc8 oinduced $emf$, 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 producesl2h:d ofle6hfn x z)2 lcpm8r+u3w:(w what kind of change on the indupl2oh(l ux2fh+e:dl 3w rwnc fm6 z8):ced $emf$, 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 removedlls3hl,jy-n w .weguz: p:9k: from 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, the direction of an induced current in a conductor,lbed; v /2 9oqwa1trb will btdb;29a,r leq1wo /bv e that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet i*nhmq +.(- -oigu4jqaqh3l)/d a bfjvs held above its center with its north pole pointing down. The stationary magnet induces (wvi m. ) fb3+o(qna g*jl-qaj4-hd/ uhqhen 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 x/kkt3 2 m:f5zpowct, table. A bar magnet is held above its center with its north pole pointing down, and released. z:pkmtc /fk w52o3x,tAs 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 il+fgs rpnd *n2s-+a /nn a region where the magnetic field vector points strai- /f ldnpn*sga++n 2srght up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field 1 m-za r3 cq,k9x0yv jh-ekfj4vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of z9qakv4y1 m0xeh-j k-fj3r ,cthe 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 horizonta2lynjpfm 76ww1d) c *i3dk. kdl table top in a region where the magnetic field points straight down. The magnetic field disappew1yif k23d)pj6m wcn kd.*d 7lars 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 n9//xs*v rbx qa horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat9/* vnx/srqbx on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a lob :p:qawzbq-; op of wire with the north pole entering first. As the north pole ente:b-qqbz:pa w ;rs 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 tgn2b i8cm3 q;b( d-eqabout an axis whose direction can be varied. In a region where a uniform ma3m eq8gb (tc2bi ;q-dngnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ab*90hxey1c (ls *dbe tqout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the looxt*he(s l9e1b*ycq 0d p'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. br -xuff 5syorwv4(4(:n l2lj
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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 y;r**sx(t pax.-f o s1iqgns+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 v9dbf t ;nbsvl0x4nsp k:t n52*1nh 5vfield. 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 mbg u d2/4;h hdeo50zdeast-west direction) is moved northward at constant velocity through a magnetic field that points sud0o4 ded 5 2hzbmh;g/traight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular-a- e ,)is t2mabm)h*g 5xblmggn* q,z 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 transforms;vbp45 x il:f4a;gujz

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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 secondmoo ry jx +e+)tlfnd),,q:s8i. The frequency of t eoqm++)y:otjf8s id), lrx ,nhe $emf$ 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 devidawj2j9fl el+ : j38boce 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 thj t2r9uwm5qqu,jx -i )hih33) m0 lyppat

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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 sj, y .hpi.h8gu0 * npd.5etuxlecondary coil contains more loops than the primary coil thenjlnpxgu. .8h 0tp,idh *eu5.y it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seco ; lnuzbc ksst z/9yk9dn,53(qk /xj4ondary coil then it is9 zk5 l,;x n/k4(kdtboqsjysn/cu3z9 a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power input ei+sug :ef8* jb(xq*p

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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 cjt rhx3 r x0uvoxf5 le47r(r)(2 tyo+nircuit,

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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 connected3fwvz d,8frc:v ppw64,i jj*e in series to an ideal battery of constant terminal voltagepfi8, , wj*ezpd:4fcwv vjr63. 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 seriem*18bbs7nad as to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the v81bdn7bsa* am oltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is aeawqh8yw:iy;+p 6b zd8zi19connected 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 connectedjb;m 0( -bd/a+:b wnpzkgz/vq 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 co:js1dwj3or o :nnected in series to a battery. The time constant forrw1jdjo3s ::o the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. rsak+s 4 0+jsddzfj y4lvo7v5q6ntp8j 7y1p3The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requs5tja 7 d 4j1 yr4kosq3++ l7vd6j0sn pzyfp8vired 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 sa,3egy*zdt5;mjv:v/ s1p./iz s q nh lmme 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 ncn1a ;-mg*v. lh4 gctpower supply. 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 connected to an AC power supply. In this circux c*5ifsmy -l+it, the currentxc+yl*fmi -5s

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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 a;ui(m9a)4xed yu +qb-iy- uiw c circuit changes by what factor when the frequen imi) 9-yea( -4u;iuwqbxuy+d cy 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 the AC voltage across an inductor is doubled, the inductimpj f 7ft)w :2*wo4sant-y xm3ve rea wa3) s n:xt2j7*fmwfyt4-mpoctance 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 across an inductor approaches zero, tq li*8 bpqoy;xvj w:1s 0si.(nhe inductive reactwqliyois;q js b0n1 p8*.v :(xance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, b:tr 2+mi/g9le4yz )ml o a r(cy84p)vtk fxw:the currekpl/t 9y ie)xv8tf4 a wm m:(rl2)b rgyz+c4o:nt

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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 ch45edekwi210i69j m6;inj)e c nhx ekyanges by what factor when the frequency is trim4kidi 6i 05xkc;j1 h) en 9w2yeej6enpled?

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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 capachw3/v.wd p 0lr5rbm/ditive reactance of that capacitorrhdl/pwr./bdw 0 mv35

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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 capacitor in2 xlnrf71f5 g4rvf nl8 a n82l gx lfn1f574rvrfRLC series 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 definekkeav29ao; w2nt9 wjxz9p u2s9 v16 oad 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 cg( rrth7n o)6R increases. When is n)co 7 t6(hrgrthis 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 tha *)iluh48b wge 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 y4+9o cvlv0k 3sj* cmerj.(jhif $X_C$ 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 cap1qe mta 8o+/ 3viir*jcacitance both double in an LRC series circuit, the resonant frequency of that circuit wil eaio+1r3/cv m* 8tjqil

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circu0v0,4r gl2;bzqva8x,vir(:q a kt phphr e*:iit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RL mqj3p xtt); y. +cowwju*iy+/C 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:wkc:9 1ydtqw rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thewd1 kc9wtqy:: loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius w ch. 0g46dkw6 mc,(1 qbggtyy0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throud4cm6cb.1g 6ky( hw0 tq,wggygh 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 m5tl2 4nxd 6.ktvgpe s9 is rotating in a uniform magnetic field of 0.20 T. Find the tdxk4nsl. 9 t 2v5gpe6magnetic 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 adjustabl/(d ccw:1:gxnuyiho z9k1x h6e 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 frofryto9-: (w5i gobdzkv3 00 dgm $4.0 \times 10^{-5} \; Wb$ 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 el3cb,ddi/ vg- pf4,uwith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifgdp4l/3 du,-f vie, bcormly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 t8lh n+u4kxvg;+nssp (urns 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 k 4benu*r-b8(b)qtwq$0.20 \; m^{2}$ 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 horizontalk dh. mr;ibhe))hw)(c 4o (meuly at a location where the downward component ofhmk. ))wrceib ()eh4o u;( mhd the 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 bar th l;0w7ln yebsd2 5x+qk3wncn5at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends2qwcs+nk d7le5n0y;3 n5xbwl 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 lo ple9.qwpyu cbox r,c3b+, 7-uops 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 tu cq+vvw.+qbc/k:gjg 8fuw 28drns 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 armaturf1;k6m 2ei qot zy(e(ge. Each loop is 12 cm long and 8 cm wide. The agt(;q(o m1e2feyik6 z rmature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu0 e 7x8-kjs+py bwj*:zt4l peurns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with anfq5+h-sj yx o2 :kfi oocnn*2, output of 12 V macqjos ih2fo2y, 5fonk:-n*x+ ximum when rotated at 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 generator w625fif b j5xav*go xfip 6f8xnjac, *4ith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a rlw-rkt3lvcbo c+*s,+ esistance 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 motor operatexru fyw-qj0 et: i7m;)s on 120 V AC, and when running at full speed it y;m) rx7q0jiet: u fw-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 .r)ugdi ebc1ww /kh5q0bk/i(connected to a 24-V power supply. The operating current is 1.0 A. What ikc5bruwe0k( wgbqhi/) 1. /ids 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 power supply 3r+m0,3c lhbf+,su ilhe)ltw. The operating current is 1.0 A at full speed. Whueh+ sf,,3 wri)t lhmcl+30blat 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 power sn;xmk2f( b0h ng:f*ue upply. The operating current is 1.0 A at full speed. What is the baug:e0h*kfm(;nxn b2f ck $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pr-au3n; t+d/lym msd1l imary 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 flow in the seeq0x.mw+ w6j(i jys9ocondary. How many turns are in the secondary 9y(j+esj6mio xw0qw .?

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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 mm33 ig+ty8c yki-yw/ sany turns are necessary in a 110-V primary if the 24-V secondary has wcgyi+ 83k3i y-sy/t m100 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 senvu3sb5r c :z0hq.bf4. b4rhp8 wtre6condary coil. If the current in the secondary is 3.0 A, what is the current 0.4h .4bqu:b rw5 b6pztefvh8cs 3rrnin 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 transformero*; ;v9lnkhxueq 7 w3r. Assuming 100% efficiency, how many amps at 24 V can flow i;v x9;h elqu7onk*w 3rn 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 10.0 mA. 8eyye+vg 7-ymidr;swrm0)p5 The primar y+0ve)dyr s-mrwygi5 p 8;7mey coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itsg .erh2 9dtmw)w 04w :n6lrfdt secondary coil. If 120 V at 2.0 A is applied to the primaryr4t 6w tegnf.:dh dw l9r2m0)w, 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 tuf,c e-hw,xmk t64sf*rrns on its primary coil and 300 turns on its secondary coil. If 12 txe-4km6fcw fs,,r*h 0 V at 2.0 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 transformer has 100 turns an4q9g3t z90 igbpyv;x:bezj. ld its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current t ep 49jvy3; lxg zzi9b0gb:q.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 hhq ly-0:9bp dtas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can ed:ht pby-9q 0lxpect 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 se 5x;vn 9lexu2agcg01k condary has 200 turns. If the power input to the primary is 100 W, we can ex50n;ke cgl9v 21x xguapect 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 is usually stepped us/b6g7jp(t)aueex9 rstb b0+p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primt t7/r)bj 90 ssa(bep6e u+bxgary 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 usua 4no gx p780lq5,*ywocxhk.xxz82gcb lly stepped up to 4500 V by a transformer and transmitted through a pkxcxw7 28b xc58zohqg,o.p y4l 0xn*gower 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 usuav(0 q2g+fw cac+)9,6 dfpzn6hploai x lly stepped up to 4500 V by a tr cf)+ 2 (6vfcq oahgd ,wz+69axp0lpniansformer and transmitted 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 lh8kd1 i+qr: ir5s ptyruu8d2 )ong 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 would be lost if the transformer were not u rpru2uk)y:d+t sr1qi5hi8d 8 sed?

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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 k d; mollvf0a0xv/s 7x02zj5 ism 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 withfma0dlxo2v50 z0j7ixvssl ;/ a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmittev.e(l b-l:r nr)d6v qyd down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted v(6:d-ylbv)qnr .rle 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 transmityjwy4sc, 8xf,ted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not tosy4jxf y,wc,8 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. o r(n/* ,qmg0nl b8zm66wmqhs How much energy is stored in the coil's magnetic fi*s 0(gm 6on m8hrbqnl6,m z/qweld?

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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 18zzo3 i1.gew 2liuj/-a-H inductor. What is this circuit's time aw-gz.31j iel2zi/ ouconstant?

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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 gqi609u)fwlf0x xwh+ f 1 p1xcthe rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outletcf3-+) t-w u jcuoh)bs. 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 intovtwcj67 vkzd u *r+s/* a 120-V AC outlet. What is the resistance of the la7rd*+vs*v /tcu w6jk zmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V mah5aztg9 et e2h*6v2ac power supply. What is the peak current through the resizea*6 2g h2emv t5ha9tstor?

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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 connechzhov 2 fbaqk u7 e1ev(m)d:23ted to a 120-V ac power supply. What is the power dissipated in the2v h71qv :oz)dfu k(e2hb3 ame 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 resifzn, wpud4ze3kk20*)s4 c x cvstor 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 5b)/k9 c4wbhr*/rq(irzqm -u d0-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 is ewt0a9 m0 zes+u 8r:uu1+jhkb$I = 0.80 \sin (240 t)$. 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-mH4ugxzb 9umb8kq( ;iw - 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 di+cqy6m g1-u1000 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 inductive reactaa7) p 6cr o5eto6hd/qyh .uy1qnce?

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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 100yjektz5-0:*nrj pfui5: ygw5 0 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 ino)i56r rdr(+tv i8sl n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied t8oinistdrr ( 5)+v6lro 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 2.5w :(v6y* ; lnsm./zqae75ra-anwaitb4 z n1wi0-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 i9l ,xr o.h1iwf) +w.vgz6gmq 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 m tlhqb4q u ly(. :fc5o-j+ v6,qnmgy,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 10l1yan5gb.(n z ekb )7g-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 capa0r+n mwr+: *8j iibc1*ntalqdcitor be 100 Ww:inrba+nr1*j0+*mi 8dtqc l ?

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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 1001: hpx;3ay5jvzmf ak)0 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance,e4iqimmixltc01.g 27 8 l99ojfo sy:l 15.0 W inductive reactance, and 10.0 W l7mgme92 .j19qc 0:84ifixs tololiycapacitive 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 1.00u38p:vgj r ryuhl i68-mF capacitor are connected in seriesryil3ujh6u vp8r :08g?

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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 cc 4,(qzx hn6brx 0yn(goil, and 1.0-mF capacitor are connected in ,4nqy(h g xr(zb n6cx0series?

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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 we vgyn9s/ ,xa 6yp(/- drvttr (3r4xfinductor, what is the im f(-ayyds/v tpe4n/,x9 rtx r63wvg(rpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH .mf kvp5cmtemq -19 s 4fyr)v8inductor, what is the phase angle m4)y8csmfq 1ftkp9 v rme5-.v 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 k-/n b7tf8qjmpjp 9 8yseries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of fm/tynb pqjkj97-88 p100 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 witcx2(v lfgwj m+-w (x3ch a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200wl2vc(wf3gx + cm-jx(0 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:o und fpxqg,gl:*5-edw* h9 x 450-mH inductor at 5000 Hz for a tot*w*olx gfp:q5 nu-x e9g:hdd,al impedance 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 mustqa j d0ld,62m;tibrr)hso e*lk0ca564 ufh-l be put in series with a 100-kW resistor at 1.0-MHz for a to2l et 5qlshr)l-,0ajau d om66rf;kih b40 *cdtal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series 2 bt s+u+ia9i fg3rrt8nk8g2s with a 20-mF capacitor. What is the impedsn r 2tg ts3kg+uf+ 8r9ii28abance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in qt (e :u,g bn(sgni;7xseries with a 10-mF capacitor at 1.0 kHz for a total iusin:n qx; bt7e,( (ggmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fe5,aefn o-na j on/:+cor a phase aaac:/ jn ,enfo+eno5- ngle 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 resistor at 1.0 kHz for a totaa 18c4t1g:-6wmgbkyy h bicm(l impem1 wi8kghmcy ty6- b1(:abc4gdance 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 Hz. What -zjoo6 /msc- e zx.u,;ach3dg is the phasex m--z3,/h ;gjo .ues6ozacdc 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 1500 Hz if a 100-W resistor, 20-mH coillr fz/(6xczonwe 9k70 , and 1.0-mF capacitor n zxz 6f0w(e9cr l/ko7are 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 conzg+ xgkpp81k5ht (fx9 l;i 3pfsists 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 current ingxhtki+5k 1f;xfp g(8l z9p3p 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*:;n.asy/ic+uy f+ o d4jsh si W, and an inductor of inductive reactance 30 W are cohsnd o +c./ fsy;a 4ii:uyj*s+nnected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circul2m 0c ke*m+crit containing a 50-W resistor, a 10-mF capacikc0er cm2+lm*tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle ojst 3sc*+ 6n-xd 3dlyz jmgvan*-b*5g x63ts5b sjgjl*vm*zg+ - *y-adncd3nf $40^{\circ}$ 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 vsm,bauh.zrx 9i( y5 :R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be drivyvx,9 riuhs.5z(m :b aen 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 12uk hwtkfb7r2-6(v /g b31qjlynirq b7 o42q 5j.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reoy q6gr7/bbb( ji1kn-uv 4kt57qhrwlf j223 qactance, 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 AC cirb- x8x( tkojj0cuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. psq,r(+ wwx *lWhat is the power w*xprq +(wl, sfactor?

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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 c q :-q52:qrhzm-3xu.spxx6mp u8m vqq ontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supph.v5qmp mq q:p-- 8s 6x3x2rq:mxuuzqly?

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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 cadfn: u,1.xqwplkq/ wiz2es8 9pacitor and a 15-mH coil in series?1e l8z9 :p w2iq.q,wknd/sufx

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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 resona(2 e ;e hhd2ggnl2t5co6k.hw ont frequntgg hc o 2 whe26(2e;5.klhdoency 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.cah- w o6bvd7 a,)2a7g+pa hsj7-mH inductor for a resonant frequency of 1000 Hz?6gp- 2o, w+a7cdbaav) 7ajh sh

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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 seripxva,y ppm; bz19y3jd1huxey . :oq ,,es with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is tux1 ph3 yzpj,m;x.yo,1:v ab,py eq d9o be 1000 Hz?

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