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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: 游客未登录  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 unty m : 81uuhky.19n)nc4q sxidits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states 9isx +gin1 q6gthat 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 what kind of change on 5.fjwq: +)s -1pq2b avdvhcja the inducedj1)q-+ aw5da q vbvfhp2c: sj. $emf$, 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 o4gu/ zkv5*its 4ut5or f wire produces what4guo55 u * 4vztsrkt/i kind of change 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 produces whato1hjx(k p(3f feu-dqo,7 )dga kind of change on the induced g7(f)3poo daed1 (,xhjkf u-q $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an 9vacl::g*lel 7:zfwx $emf$ 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 wi-i7cka 3f(zkdll be that which tends to produce which of the following eff3z 7d k(fiac-kects?

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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 tablr6j;mzv; po- ze. A bar magnet is held above its center with its njmpr ;;zzov-6 orth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hgop )86c6a18jow*ssv:ny)hxy g2 wrxeld above its center with its north pov*swgrgcs88ho6w)y 62 n1 ) op jyxx:ale pointing down, and released. 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 i /qzp-p26ly4 9znstbv n a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in/nq ztb4y v9-slpz26p 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 vec .)jtkejl55p etor points straight up. The magnetic field suddenly grows stronger. When ) kjelpejt.5 5viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horlo 1+( 2) tgxtpbb7fjzt4x :vmizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, x fjtloxb(1gpb27+ m:z) v4 ttwhat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carmdgtu98(e;o q/0 4wu q vmx-byries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewedm/(y0 q;mq4 x9 gbe-tv8u wodu 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 north pole enteri pidfa5-e)p1yg: 1pyeng first. As the north pole enters the wire, the induced current will be:) pd iaegy1e5yf-p 1p (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 c tp;5du ej3+ e3l1w gbp6phis* 0edsi-onstant angular speed about an axis whose direction can be u g-ee 1d*piblwp35ipd;e+j3ss th60varied. In a region where a uniform magnetic 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 wip ,+(ryu4lpnu63b7gfx mi y19uwka+l re is 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 be the orientation of the loop's axis off g+m u7y+bnp1 xa ,4ku9liw36p(u rly 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.dc 9ji79e,yn7;th dzt
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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 th5dhviy y1o*+1dusz) :wgb ,fnm*x (h vat 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 magnsb,z)- 8yh lx wwkwaop vm1xwtj.5 7nr /,kp35etic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northw::5 )1 acjto oklrg/lfard at constant velocity through a magnetic field that points straight down. Make a stat cl15 :t)afkgor:/ oljement 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 bari7t*v gta.i 6f rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator k:m*raxlm8my j 5ll)mc7 u 9v/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. os:- fqtnor7 l453cxt The frequency of the 3fx5-r7:nlco st 4qto$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tm1o 6y+3lqkcw e/ qeg:o

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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 thaq; /,ns tti)7ez:z r2-hh2xui3 udqwot

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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 +-jq w4b smtr:contains more loops than the primary coil then it is a jw -4:bm+sqrt

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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 tjzjle:h k;81rhan the secondary coil the:l8 jjezh 1k;rn 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 poqy6 s0+fpfx/k 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 circuitj (*xar3m*nd4r)nn8h yfn5xu ,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batteryxq), tu4h3jm ou su9q) of constant terminal voltage. At t o3j,uts)hqm 4 qux)u9he 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 conn k,/) gubk*aj;-bj8 u vt t3li+tfw)jkected in series to an ideal battery of constant termii+vgf-) tw8jltukjk /k)u*b;j,b 3 atnal 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 inductance L and resistaie1uoh8x2h0ep7/t(l5ah pk znce 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 connected to an u : k9q8/13abqv cohcd$emf$. 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. Thhw - nebc--wi5e time constant for the circuit represents the time required for the cuc5bhnwi -w- e-rrent 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 conne)c4tng -jn* uzoehn3; cted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the ti3tn*- h nue;n4c )ogjzme 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 the40z+ rryfv-o5 bnkpy z ,n) +jqi:rt.q 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 ACe 1-2v /frrtxu power 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 pok03( : tp ha4ihmk-5va5kyppewer supply. In this circuit, the currenp(5kvk5h ite3ka0phmp y4a :-t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changtvx9 hd:xgg7 iprzpzo1 v*/-, es by what factor when the frequencydx-ti*p h xr1:op , g9/vvgzz7 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 do 5c(g,mkc gb-cubled, the inductive reactance of that inductoc-(c m5cgk,bg r

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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 inducto.1cgc72;w +(w6b3:pyp a hge khunionr approaches zero, the inductive reacth6:hc un p3y+g.bw2pc; n e gw1a7oki(ance 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 cirmq.w+dl7 e evd9hn(etm)oz-+;m mpy;cuit, the currentpn.;-ed tweev(d9m7l hm oqm)++ym;z

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancc* )dnr:e )naxe in an ac circuit changes by what factor when the frequency is tr )):da ne*rxcnipled?

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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 acrod:*uoz-x gp;b2 5h5ia n4xspuss a capacitor approaches zero, the capacitive react;usxd* -huaoi5pgx nb524 pz:ance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the volta3ko954feo(j ) v3jzg*kgze klges of the inductor and capacitor in a RLC series cir( ko5k9 4v)jejf3g e kzlgz3o*cuit?

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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 RLCh;67xpf+h0g w,w4c2ki dw xg d 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. The impedance of v;-x1e .no *4rbc-7* r*akarxkvd oezthe circuit increases if R increases. Whc1*d nx 4ez--*o.akbox k;va*errvr7en is 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 circuii0fa45y2yaveq wq3dqh .l5 zaf ,.(a ut. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inc y1z ,wae cbumd7l1m-5reases 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 LRkrs(+. m-gyg gv2n0c51v rvcxC series circuit, the resonant frequency of that circyx -01.cg k2(vn+v5gvgsmcr ruit 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 voltnvrwb .a54w 3rage. 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 R.tnbe(;ya+ubp0 r9 lr LC 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 1 bwx m. 5c6.3fgkeredin a uniform magnetic field of 0.20 T. Find the magnee3rfbx.kwe5dm c .61gtic flux through the 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 0.10 m is rotating in a lmy7pvww8n9ed7q/r6 uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whenrl7 wpye76dmq 9/wn v8 the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic 1z )wpbb 1fov3wrh u78field of 0.20 T. Find the magnetic ff1zh) 81borubw 37pv wlux 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 l nk369df5 eoj5ai*t 33emzguaoop 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 from + lqfa9s 9 v9b/dptq,8xc3ib x$4.0 \times 10^{-5} \; Wb$ 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 wireu:o)e(px v*qc on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the ind:e)v x*poq u(cuced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns an h1o a:3y n; *lduqfgs+i9 -q.k;skmapd 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 area1 )zvze/ qq;zz)ako8l $0.20 \; m^{2}$ 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 1rw79b pophdnjy*e :-horizontally at a location where the downward component of then7y1r-bhwjdo 9pp :e* 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 that is 2.0 m long rotates atc 8 x3june8:waz/26iy zdl.xa0qcr p5 a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant 8c uazx2 lxj/qy5wza0pr ci3d e 6:.n8magnetic 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 hasznwu -.cbu )cf*,ps e-a(n2 qd 50 loops 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 v9 ijy45sft n(c9e rg1turns 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. Each loop ek/lcb w8 y6w9is 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 rbwy8 w9e6/clk otation, 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 consisn4eykkkvdx27x;.r crb s,3 9jts of 100 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 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 an output of 12 V /m9mb0 b5kdwnrc7p *+tsl u,gmaximum when rotated at 60 Hz. A g p7m,b nu db59c*tr+kw/ ms0lmagnetic 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 with a maximu55xjrgl57: anrd cq)vm $emf$ 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 i/n)i px o69bthave 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 6.03 lr a9 45jlr-m/z2hq98sf/nhmlmdns0 W. The motor operates on 120 V AC, an4mf 98/r rs3a 2mh- 9q5l lnnzlmh/djsd when running 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 resistaj.( ) uxf7)e,nxfpd.v0b nau ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-upxunb.e(fpf) ,au)vnax0dj 7. 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 6.0p/y hwmakm- 2/06 ekyl W is connected to a 24-V power supply. The operw- m6he/a/yl 02pkmy kating 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 internal7t ,ib23u nja/x*kux0l+p w qv resistance 6.0 W is connected to a 24-V power supply. Thvq bi7n+a/j3lw0px u x* u,kt2e operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer xrn r8. oxjt+ ro9h1j7is 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 ofdh8lty93s9 md4q 9gtn a transformer causes 14 A to flow in the secondary. How many tu 9q sl9thd93g4dmtn y8rns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V 6p , +qhu*e-wwoi*osisecondary has 100 tusp,*-whu+ iw 6oe q*oirns?

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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-tubljguhf oi e0+y;;dl xb //jj7ny/6*krn secondary coil. If the current in the secondary is 3.0 A, what is thex;y/b6/ijl *0lkbdh uf; eo+/7jng yj 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 transformer. Assuming 100% efficiency5myzds8z2 i y*s;. dvd, how many amsz mv8ydz.i 5;2dy*d sps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 1)2acx.cm1po e.nn x /q. v8ndv1axy -lvfn1. v0.0 mA. The primary coil operates on 120 V. What does the primary dnc. vpnav-12mxfc..o e) nv1d xvx8/qly.1 naraw?

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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 o0po-rd 88v *ukcb(h gm;,aclzn its secondary coil. If 120z(r,b; vh 8-*p8gau dlm0ckco V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns .j,3ab rj v*toon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curbv,*r 3 jta.ojrent 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 hasor4ntst7f hz6 uw-* 2to, kt5pzrk:ev5)iil- 100 turns and its secondary has 200 turns. If the in ik5u4k-plntrthzor t265,fz voi :-*)ts 7 ewput current 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 a17ml,fav(ddl f28wo its secondary has 200 turns. If the input voltage to the pfodw7vm ,8 ld2 a(af1lrimary 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 has 20 2.6d+n d+(wvsi vkvh8njhah90 turns. If tjhi9 .vhvn68s k+d2v+ nhdaw (he power 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 usually steppe /v-woc+x 0xkoxt-x2ud up to 4500 V by a transformer and transmitted through a power line of ooxk + t02/xwxu -x-vctotal 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 1)9os) 7l*atqm rwzw/f20 V. The voltage is usually stepped up to 4500 V by a transformer anwf)aorz)9/t* ms7q l wd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedgn7 tksm.t53v up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percenta v7nt5t sk.mg3ge 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 res7 nssa 3e(qcc(d(pq7gistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy qq3c 7c nd( (asse(p7gloss 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 used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanceoh(g-v0 k p.r26rp8u jlzrik8 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 percentagup .0 kv8-2j k hpozg6l8r(rire 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. Howi f 30uhfqg1:pq ez5z*o-- btq much less power would be lost if the power were transmitted at 3000 V ino eu1-q 0p-qh5q:ztfgi*fbz 3stead 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 A1x2b:3 jzzm cv. It is to be transmitted 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 nocz 2z3xv m1j:bt 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 coiln( cs l85wi8f)ixx/cn's magneticxcnn/if wls )c5i8x8( 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 ax*n. ntmhsfnd4 s je 5l)lcyg3:zh 1/5nd an 18-H inductor. What is this circuit's timecs5yl/4zl dx)*nnh t3.5eg1fn :hsjm constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltal90b sn9q u6ddge 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 intghqkygww c9.f57;f560ed uu qi wf:5yo a 120-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 in./s-y4.eac fvq *hxqeig-; twto a 120-V AC outlet. What is the resistance of the lamp?/-qa-* q;ixe y4. sfctwg.veh

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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 +r: tkn(c(uf uto a 120-V ac power supply. What is the peak current tk+n(:utr( cf uhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power fnes 79(so u2(dzy ea6supply. What is the power dissipateyz du((76f 2sa se9oend in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-p8h6,qqxdt10cdlu xk b9)5wyW 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 re83lq ib 60brtdsistor 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 resi f0qu a4jk c-bbeq/e5ybl0 9y(stor 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-mtrkv ,tv rb8 a g/do+3aftn6xc;2p +n.H 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 inductive9js7d wl9,nka gwji20 reactance of a 2.50-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 14.03u w/ojkbx mf*iv35b3-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 1j. bk u*2gimy4*kl3 ug57 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-mH inductor when 12i .t.fy( y bxhkbk.2.v0 V AC at a frequency of 20 kHz is2b.xkbh (yf. v.y.tik applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz so8qzv ng.bs4 v9urce?

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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 r4uw5a /db 0g9xh hwz4exxr 9a+eactance 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 neede4*kfy a7d -qdez4ay3y;v ur n0d 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 capolswi8f*3 yd6sp2cb r+,jt0racitor 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 capacitor be 1cw;fm5 ;v- a+,wpm18kdockqlbqa 3 h;00 W ;5mqadcfw;b, ha8cp3 kqvm-+w1ol;k ?

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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 crbsr 6cv) 8py*apacitor 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 series circuit with 12.0 W resistance, 15.0 Wu*v9 cwme7euhwe( 6rqw,7 uxj8ppx8 2 inductive reactance, and 18up92( wp,mw7wev* cqh6j ex7eruxu8 0.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor,+3 ;7g3rpveqzz h uoea y7n7m+3mb5av 20-mH coil, and 1.0-mF capacitor are conne37;avhem+mq7z35 ze p+ 3abo7 grynuv cted 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 1:3*pvi tpnfsp6w8go 100-W resistor, 20-mH coil, and 1.0-mF capacitor arep:p8i o3n 1pg fwvs6*t connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wik m9jn)n-a 3n79eamsnth a 20-mH inductor, what is the impedance at 1000 Hz9 n-n) njn73 9meaakms?

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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 2/*kjizna3e z(83e6ul unx. sa 0-mH inductor, what is the phase angle zanu3*s(anz lx .6e8u /3ejik at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mpf a3nd+ 7ixpsa0.z8r3zl*g uH coil and 1.0-mF capacitor for a total impedance of 100 W at s0laapid*rz+7.n 8gf3 pzu3x 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 capacitanewd s30d.j1 amces is needed in series with a 100-W resistor and 15-mH coie0m sdj3d.1a wl to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be wlu6m;xx8k7r f;vn k)put in series with a 450-mH inductor at 5000 Hz for a total impedance 6 lu7x ; xmk;nvwk)fr8of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for x 84lq:zbfoy.a total impedance oz x:ql.oy b48ff 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 sera 2v)0g0kxq1eqo-tml iin 9,p ies with a 20-mF capacitor. What is the impedo 0 i2ptianlxqk91-e0v gm q,)ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fgbp. :0oippq 5or a total b:p.pp5gio q0impedance 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 b: .uc02q.- f fr8tohpsjkrc0 in series with a 10-mF capacitor at 1.0 kHz for a phases8 fobc 0k20ph.rf:tqj.cr u- angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in hmjcm -n5qxf k-17:h dtk 8zxq *un-x-series with a 30-W resistor at 1.0 kHz for a total u*-nzcx qq fnh--jh -518 d:xkmxmt7 kimpedance 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. rp,)vvhf .9ktWhat is the phase ang9r)k.v f phv,tle?

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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 )hj *hnxe4(vp)t o)l p9y h5 vi53epvnif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteni9 (ej )v4h)5h e3phvvp xp)tlny5o*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 consists of a 100-W resistor, a 10.0-m 42o qo*rzug7cF capacitor, and a 0.350-H inductor. The circuit is connected toqzo2o *cg7u4r a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, doqukkb mo3*ep)-pym 6fbo f+6w/6(k a capacitor of capacitive 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 in this circufopp k-*k)wmob/6ufy6ek (obm q3d+ 6it?

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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 resis 2c oyw.a2thm/tor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup.y2cmwt a 2/hoply?

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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 amno;p f66zzr 1ngle omzpr;61f o 6nzf $40^{\circ}$ 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 mo 8eus0 4nd7a*i1 rjjeF. At what frequency should the circuit be driven in order to have maximum poanej 7sj81i ue4* odr0wer 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 2 +aaj9s znka*resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 9kn+ aja2z a*s120-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 atx*2.q:h xp 9r xf9tpgx*p8lsn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 Wmlr.khv 1a( 28pun;ec and a resistance of 30 W. What is the pk vuln1 aep ch8.(2mr;ower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit conrlz jup1 ag -.9yucx7ja *9ta)taining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, lp- az1xu y9j*tu g7ajr.c9a)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 capacit4k giee 7:qu-cm(ui*qor and a 15-mH coil in series? *c7uqiu:eq(g4 ik -em

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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 seriejsw1) )t.pz (zxt z.a6eky ay6s with a 4.7-mF capacitor for a resonant frequency of.aa yk)z1t .jxyep(66 zw)stz 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 resonah/nvo7r) r fd1zt. v6xnt frequency of 1000 Hx td7)vz rhf6v 1or/n.z?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor b dns ,+ ;i8jfkygi5ibo0*ib( must be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to ni ,+ iyj50obs*ibkgb;fi8(d be 1000 Hz?

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