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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 0u6t d f,8 zqr 37r+*i lx)1flwuzuuxt+ bbzb/magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tha :hg ep1z lm+., u3oncgjbu*c-t the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces w,m qy1gmjfrqg1ys:l :*2m7y*b w00*wpcy xjshat kind of change on the,*:2gpyy1m7jlycm0q s 1rjqfmb *w0wx* s:y g 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 fie:ul air30 (zmpld through a loop of wire produces what kind of change o0lr(impza 3u: n 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 wire4l.luptj,r81 j0m*ues p7 sld produces what kind of change on the indu1ssjpll0lde *,u4t pjr7mu.8ced $emf$, 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 mag 2dmh ez;d8:mqnetic 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 so;ocz;yq.) oo yikg ;3vb,,tconductor will be that whi,oyigsq;coz b.o ;3)k yo t,;vch 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 is 3;),kpn:f e yv 5wo,+8brbreyg)dqil held above its center with its north pole pointing down. The stationary magnet induces (when virb )keb:n ;wei3+p y,vlr) , odgf85yqewed 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 iusho56qgj,7 9kn/ xrhs held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed frkj,x /g6hnr 5uqos 7h9om 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 gb8q en)r*i9w j8e2jeomdrv2f6 iz+szf s )) 3a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induczieq ) fs9)jsjmev82e)r* z6o8rgbd fn 3i2+ wed 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 mke) kkuvuvls516 x/ *bagnetic 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 fiel5k /els6vu)kb1ku vx* d 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 horizon vfl,hohn.0(mv c7(/ c s-glwntal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in7,( hvn0 .vclhso(cwm fl- gn/ 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 lr )( qf/95lsrkw:cmlshp8 i0xies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one lwiqp9m):x0kr /l ss8fc(5rhon either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nou3 zjg0u))exzq9s 9nu rth pole entering first. As the north pole enters the wire, the induced current will be (as vequjgn sz)09xu9)3u ziewed 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 whoho f:s,wz*0eq/ osnu6t. fu k6se direction can be varied. In a region where a uniform magnetic fiefz tnw*q u60,/e. sf:6sokuohld 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 spee;;r+ zze i pu*iumc1ohp,yk *0d about 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 loop's axis of rotation if pi;u,keo1;+u* 0zzp*hmc ir y 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.h(q)wv )hvc;*9- upk* ih bccv
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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 luj si)sj3h6yc7(z- bt u1tn8that 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 zfwrw(ps 0.cf7yg j(a1a( yp 2field. 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 at jtz+ h:o4g/eu constant velocity through a magnetic field that points straight down. Make a statement concerning e4:u ot/zjh+g 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 const6mg bd/ij,sv-mmbv -8/yo-epant 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 generatousm7xn 4wl2o+q ae-7 ir 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 frequency 7 a( ooa-zae vx55)hukof tea5a7- )uzh(5oxkoav he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device useyc )9bjg6-o c*k/wt+ ka2ewesd 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 devicy) as;xjo/boa2yk8o 5e 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 ta x*ggux p+08*lxrwn.he primary coil txupngx+la0 xw*8gr . *hen 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 secondary coiq3x a 3q95hbexl then it i53xb a 39exhqqs 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 po// dfre 759hhjzx2fbl wer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,9whsxa( ci tuz2e3os;u ; j3*r

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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 inductorrcu ox-u.vsru:2q ;02dm6ceb are connected in series to an ideal battery of constant terminal voltage. At the momentxrum o22-:0cedvu6.u cb ;r qs 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 a) (eb3b2g pqpseries to an ideal battery of constant terminalbe bp (pq)3a2g voltage. 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 inductanceb8f xyn+bm w p86/s09o+f8+q zphk eoi L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connec bqt5 p1.we8smted 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 battery. The v0- 2 f7a/ . aidkbiuwew;wt)ltime constant for the circui-7vu;0 fiwalae2d ibkwt/).w t 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. The;lusyor7-x : l battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decxll:ou-s 7y ;rrease 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 tle )mu2od6 :zdhe 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 su )kkr ,hkewjx2hr.1511 pxsnvpply. 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 and 5f yw+gdmg;xc,59p 7a8 vtqn AC power supply. In this circuit, the current9d5c 5 7m;y8vxdgntqafgp+ w ,

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fp mhlp -4:m1xfrequency is trm : f1-xphlp4mipled?

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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 if8n t48iq:gj0)nqyiwxu ;m)g s doubled, the inductive reactance of that inductgfgn qmj: w;q4x i)0y8)8intuor

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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 asf;jp/ve ;hlm7b v h;2hl-q:7qgcfx2 pproaches zero, the inductiv qflb v7e;2f/7 :hqm;hcpl gh s2xj-v;e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuirlyqmzzb:/y p.4hk5 g/*+hwkt, the currey+ k/h m:z 5.gklphwry*z/ 4bqnt

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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 circ50x3 )hkjj )xkn*ullduit changes by what factor when the frequency is0 xuhjk )dxln3k )*5jl 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 t . 4ei/h0yjfythe AC voltage across a capacitor approaches zero, the capacitive reactance of that /.tyfyi 04ehj 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 voltag5rzwtoc6 kdn, 4e4uf8es of the inductor and capacitor in a RLC series circf cnzdek4u 8r o6,w54tuit?

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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 as r0w 5cep;pidkx50fz:. +vrl o$\cos M = R/Z$, 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 urc z:,l93e*ar un tm)impedance of the circuit increases if R increases. When is thisrc m*: 9lzue)3 n,aurt statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit ludt mu36 d7p*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 il,:,ayc-p6tjal3) iea tig jpy/ :9rqncreases 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 Llhwtu+t6 dv)14uxo fl,er :5vRC series circuit, the resonant 65wtuhfvv:e t l,)+4olu dr1x 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 s*k0n*q9pyhr o3tr,bby 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 serie* b0vb9mht7 ,;mxia dss RLC 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 in a unifibzl( b:p4 b::umgxw.orm magnetic field of 0.20 T. Find the magnetic flux through the loop when thx:lbiwg(b 4:.u :pzmb e plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 rqsnw kd1g-pwn3)7j/ m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of p1/j-qdn7k g)3 n swwrthe 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 ro6tk nwzr. zwvm(w 4f+2d :1dbstating in a uniform magnetic field of 0.20 T. Fisw2mkf w. z+1b(d4tzn:6vrw d nd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is-)n: y yde-jt.4npu hx 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 co or )mi* 4ttm y*9upbjkshq7:7il changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18api* hm1v.ev3p kg5m+ cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, v ma e5vph1m+k 3p.i*gfind 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 tut i fm0jvy61o0kh)hn4rns 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 9 on8ehag6u (k,d9d wuand area $0.20 \; m^{2}$ 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 spfln3uy s*4bq uk1t:e/an of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fie/t4kfs:y*1 nbeq ulu3 ld 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 q eos5zal80awd+2dn+that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a verwa+5 dn8z+q2odslea0tical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional areyh 19v7g/8g0zo fcc sb,kgd: ba 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 sz rf do7b),,og9pm 3fgwd1b5.i5aonarea $0.090 \; m^{2}$ 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 om vw 8wekh2,i7n 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 rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what wil,w2ewi v km87hl 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 wt.2 rh+0fe j,sbi6aq; fbi 0aturns 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 cc2rn vfr4/mic )p5)uxp80v:ktre 2wmonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If thepr 2vmwktuc v50/8x))f:cirm2 epn4r 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 wql3axfm7 0ox+ith 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 3h)o6p6wciugk up .amc) ipr 0+0)biwhave 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 resisz7kzu89jkrmm7r: 3u- p ta y jfqp+0u*tance of 6.00 W. The motor operates on 120 V AC, and when runnq9 k0 *k83-zjtmpuya mfzju+ r :pru77ing at 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 power suppkfx -3p c1oe- f.fx2y*h t(uxply. The operating current is 1.0 A. What is the start-up curru-3 1ffot* fxc2e xk.hy-p(xpent?

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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 resis8aouklv 4a) r1o,cn/j tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What /a,oa1)l uj 8ckr von4is 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 supplu fg,ba8 m4v/oy. The operating current is 1.0 A at full speed.avgu/ofm b4,8 What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is n-yg hn odn;t32/rmg/yeeded 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 flow in the;vvtetsy;q0 an ( 06x+ ew9yrx secondary. How many turns are in the secondary?a tvnr x0 ysetxq+;e;v wy0(96

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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 ma ypt)57lxl.sbj 2uzon mc,2h;ny turns are necessary in a 110-V primary if the 24-V secondary has pnc,2j s7myz2l 5x)bhtol;u. 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 secondary c60 yysxfgjzgvd9jo5 qh t s u;9e)w/(4oil. If the current in the secondary is 3.0 A, what isyh 6g e sf/jt9xyw(9 zd gv540;jsq)ou 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 primar*wryx. ,w) cbb5oda 6wr l-b3c8axb+ cy of a transformer. Assuming 100% efficiency, how many amps at 24 V can fl, raxyl bw-5d.b3bcwxa+crb 6cw*8o)ow 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 10.0 mAvg9)+geop gd yc1ijnk 3n7:mq o2 et:9. The primary coil operates on 120 V. What does th tyi7pov)gmg 92q egk3:1+od:nc jn 9ee 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 coi 8 l)6ddgs,flje ( eh*sf7aw8ql and 300 turns on its secondary coil. If 120 V at 2.0 A isg7f(s8* ,efewsqj l8)dh adl6 applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on itslc+/y.3hdsk+eqogn .d:fi,s k/e )q v primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied3k/qq)snocgl+e/,e.sk. df: ivh y+ d 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 and its secondary d/+gfmnm.pu+btm or/ w2s o)6 has 200 turns. If the input cuob)/+t+/u m2ondr .p 6sfmwgmrrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20 :p -qynmx;vmnv,fx5gk1 ;1 nr0 turns. If the m-, qmg:nr;1f;kp 5xx1ynvnv 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 transformer has 100 turns and its secondary ha lhl+o.o;a, rk9w,qe ys 200 turns. If the powa,qkolrho.ly9,e ; w+er input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is us s, l*p16awcbyho9;sa ually stepped up *aoh,s6pw;ys l9ac1bto 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 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 voltal vp)0)tcjpikljs 08 *-ancx:ge is usually stepped up to 4500 V by a transformer and transmitted through a power line o)*)pjpll sk :v8i0ac-n0jtx cf 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 usually stepped zqy/8j86s l6 n( tx)5fvpgj vcup to 4500 V by a tra/njctp8)5vjf yx(vq 68sg zl6nsformer 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 long has a total resistance of 0.60 W. d 7 bk;xtqam2e z4j4ynb)6mc owo.5r.A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppe4m 6;k4boa.x mwo2dcyq)7nre z.5jtbd up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line y7 dk.racb+p:50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to py:k+ab.c 7dr 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 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 be maac6fy f:z. 4lost if the power wfaf 6 y:a.mc4zere 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 generatrom+ juxib 38gzad(.h 0ax4 )lor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. ju laxh8 bagm)(3x +0oz di.r4To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carriewabst5j ,u rfbib9dc46bcf fqq)(:9 5s a current of 5.0 A. How much energy is stored in the coil's uq jbc6)5, t:sfqrb5i bc(9f 4d fbw9amagnetic 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 resistor and an 18-H r w4p;gbn;2i- pvo lxd:a1d*iinductor. What is this circuit's time g i 1;l:podn-*;xdvw 2r 4iabpconstant?

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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 cjog;k9c2mra m6o /dg(ircuit 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 120-V AC outlet. Wh j e k98z1e7;/hjrgzawat 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 -gqiscx6 m7fn0k.6 wf AC outlet. What is the resistance of the lammnf fq0xk c6si6g-.w 7p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suppl ** l84 5ggxkeaduhg)ry. What is the peak current through the resisd*gk haxuer8gl 54g*) tor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t)i6gw(lzvqrh ge: ,:n hpxl9 1he power dissipated in the repql:hw: l1)rnhv 6z9 xe(,gg isistor?

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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 5 zzko 01xi*sj40-W 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 a 50-W resistor isavuw m3ck: / ksc43oj7 $I = 0.80 \sin (240 t)$. 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 resistor7 1segqqs* qadfxv073 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 0xvi3obok/ neh984p (u*cjjiof a 1.0-mH 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 akwl t0iapzn*+h 2nu 9o j:6(fft 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,5sakrhb3ipd t-.+ *hf,be.s hnf dx9 a 14.0-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 inductiwjct/(.ld p2rve reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V3hp -6got*vv58e bnp c6b eoxj:6jsm*s:e ad; AC at a frequency of 20 kHz is applied tod86jtcj x*6as6bp h*v3s;e -e nogp o:veb :5m 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 1lw8rk/txs (3q 10-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 reac:7so v+chzkm, tance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reacta 76ofklqy/x:v nce 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 1200 *. -9mdy m7mz3f(va8 y*zgj -ygxqsil 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 capacitor b8-et v)kcjd(kb 2ign *e 100 W?ivn cg* -kbedkj8t 2)(

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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 an bgo2n(kcbzoo9+ * :rqd 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 resistanf- /mliy z-lqg..2ey nce, 15.0 W inductive reactance, and 10.0 W capacitiv . i.ymz/fyl 2-gneq-le 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 impedancego *gc; 87vpbjv/vx7yfa5 r d37 -mpaf at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serivfpvgb-;cj3* a7 xv f5o8g d7ry/ma7pes?

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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 1 nd(8vccetek:81 +e(gyfsu9a .0-mF capacitor are connected in serif+en1t8 (eke(9 c s:uca dvg8yes?

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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 inductoff 1gjo v9 73l:zwha*or, what is the impedance at 1000 H9*3zfavo lhg1:7o fjwz?

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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 connecte6 dyfmxxnf(g1chw ;2nn4fdvc vc /127d in series with a 20-mH inductor, what is the phase angle at 1006 x; 2 nvxghnffn(21/1fvddwmc cy4 c70 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 1.0-miol a4961 kz6c+f ckgkF capacitor for a totaci k kg46koac fl9z+16l impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capac62fq k, .kvu 30wahobpitances is needed in series with a 100-W resistor and 15-mH coil to get aq2.pfw 3 hkbv0ak ,uo6 total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in seri+kttmj91i6 dces with a 450-mH inductor at 5000 Hz for a total impedance of 40t t +6kdj1mc9i000 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 vfjn0z2u45t x100-kW resistor at 1.0-MHz for a total imped0fzjx4u n2 t5vance 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 connecteb6t qjzuka u 6thwc8(5das.*(d in series with a 20-mF capacitor. What is the impedance zku8 5b tqwd asu((hc6a* 6jt.at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHr3v(3s vs a; an i zhk*biqk;+n/d3o7rz for a total impedance of 45;k za+ ik 3vdsb n*hqsr3iarv7(o3;/n 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-m.d1zo4u0 /onab :lyt -kjd:vmF capacitor at 1.0 kHz for a phase an v1/ b 0to:u4ayndzk:l. m-djogle 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 neef rb+k96pcqpc-9 7kaifio1xz-15 k gsded in series with a 30-W resistor at 1.0 kHz for a total impedikf 1po ck 7k9b-gaiq+xzcpsr 1f659 -ance 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 c)0;4ow zfccxnsx y7 ok+-ou;w apacitor at 120 Hz. What is the phase an)z;u oyo;f-kwo4csw 7xcx +0 ngle?

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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,blsm ,mi/:g2ohwj8 k 3n d,s-q and 1.0-mF capacitomdki j q,:2w8/homl-n3g,sbs 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 consisc dqya8 b(;zr 7j/x3gmts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V,c(;qb yd/gar3x8 jzm7 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, and a 2pit 8ar8 /roqk25b,5ft myj sk.fp,jn inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuftpj ,yb225fjr8/.r5mat8o k, ips qk it?

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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 ig- wsrfyp.u*pm*8 1jcug05o9gv ot7 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powe 7yptr-8u1g*u cg0o9fvw. smi *j gp5or 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 seriess4 /kd4xsfh+e with a 500-W resistor for a phase angle of+hx ss/k4fd 4e $40^{\circ}$ 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 =4libg 6g 3*omc 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving so4m6cgg *o l3biurce?

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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 seri+z05.- geskt1e ag lnpes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0zlka 0s 51n+ etp-geg. W capacitive reactance, 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 circan 9 8yxawd 1u f3cb8zy7lk1x1uit 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*.t8g81 0ga : rkgduypvhbm W and a resistance of 30 W. What is tkg1vm8-g*b gy ar:wp08 .duhthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factejvh1j5l oi7j +hfp- q9 u0g/vor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powev5i1 9-e qjju+lv07h/gfjpoh r 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 coil in serie) vdygg0 v /n3;6r eh) git :e./rxjsiy5vhq5us?i.)hvjr/u v5y0g;r i3g e6ht/qyv:es dg) nx5

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neeiexyy8 2ccn,2q qhf68jv rw ,8ded in series with a 4.7-mF capacitor for a resonant frequencyc8w,q8 yh8ix2y qv j6er,cn2 f 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 indu: s zj um++bv1:oji;zfctor for a resonant frequenum +b:f1 jizsv;oz :j+cy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed :)rjhj *+sr4jlmwv :rin series with a 30-W resistor and a 40-mH coil if the resonant frequency of trmj4:*):rj h+jw svlrhe circuit is to be 1000 Hz?

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