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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 magnetd u.a62g4wjmv5fq0f wic 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 +q/kgkg nuncc 8 x /:8yemsvy)c+ 44fgstates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chacy4,;crpyy;v5 u6 wsp nge on the r ,pcs yvy 5up6;4;wycinduced $emf$, 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 th-7y.j,jqznwe4v v ) ss1 /akburough a loop of wire produces what kind of change on vs/nsj.k uy4a,- v1)zjbw7q e 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 neyy;f1ch. -2xli6 n dof a loop of wire produces what kind of change on the induced he 12-dl;c i yfy6nxn.$emf$, 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 j, /ejl..he *aalwa-i 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 diree (j+dfivcd;4 ction of an induced current in a conductor will be thjdcv fde+;i4( at 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 f8+,u z j3pqfubtd m:f(zb1g :xlat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (g: :fbbdm+x(uuztf z, 3jq18pwhen 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 h. uwnt31t wso)orizontal table. A bar magnet is held above its center with its noso1u )3wtw. tnrth pole 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 in a region where the magnetic field vects nlui3me05vp,u oi1nz6.c8sor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current iz u531, em ncov.p 8suli06nsin 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 8k+86ztxo zqd level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ofd t 6zx+o8qkz8 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 horizontal table top in a region where the mu4s)hc7 xn4i(wdk lt +agnetic field points straight down. The magnetic field disi 4xl+ tk4s)(c huw7dnappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a hor6 tv-tpv 9+krz+ub9tbizontal table and carries an ever-increasing currenttp9+v b-9kbv6 ztru +t northward. Two coils of wire lie flat 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 loop of wire with the north pole e wwve6b 0 agulqb,trmd;e8/ :,ntering first. Aset 8w;,0 mg brd: v6bq,ale/wu the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axi(i/ yd:2pbogoyh (8,gjsqv 7zs whose direction can be varied. In a region where a uniform magnetic field poiy p jyzgs82/o:,o7 biqgh (v(dnts 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 adc-1t3hydy ygv 1k6u;t constant angular speed about an axis whose direction can be varied. In a region where a uniform magn; k1dydc1vhty6 g- 3uyetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.yllz-n9r c:r( fhyf ;o qrl-:+
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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 an 6 , 2ndn:xwbfb$emf$ 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 m nso2 cpz 7qg4u9ii*g.l ,j7llagnetic 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 northward at c1tv/ jcv .r)x.a 0 l3nvkf6jktonstant velocity through a magnetic field that points straight down. Make a statement concerning tl vtrc3.1x/ 6kf.vjk)0tnvj a he 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 velocnnbsr .;.x a.+ gpfh1ns,93 iphjciw3ity $\omega$ 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 tra q2i w0cprg(lme.kp. -nsforms

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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 seconfpf0iv (ss +34r gx+zfe :- ikid3.wgld. The frequency of th3(srgx4sp lgz+3f .f:i0vi+efkiw d-e $emf$ 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 usef ,4*bz4 boch l4pque:d 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 th(80 mv;u- .nv ztsla k0tr-yzlat

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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 secondarn,ev*thn8+;* z:ln 8atiq0bv, gi wewy coil contains more loops than the primary coil thel bq v,*8eg;tv:,innwi0*t ne +8whaz n 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 c;bxt; pe7u+ploil contains more loops than the secondary coil then it ie+;u7x p bl;pts 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, thedi b32sl/zn mx )nxj1soj,. t: power 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 circuitbf2 +8qxvk 0:/e jpscs.6o mpu,

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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 bao u/lg r,tc3,vttery of constant terminal voltage. At the moment contact is mrg tu/v,l,3 ocade with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of const8l +orbieyx l4l.h53tant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor isr.3lt 5xhy el4obi 8+l

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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 +49huok6i cm;ky;az mand 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 connecelhfc1o9:c 5 :(y qii63cqknq ted 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 hy.h.uaamd99p9jm xfnk;-)k a battery. The time constant for the circuit represents the time required for the cu9)nmhfmhdk9..ax;pj y9ak -urrent 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 se 2rmm q.4sngx)ries to a battery. The battery is suddenly rm ns)xgm4.rq2emoved from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following 8mik 6jp u .t:3*rsdk7gyh.bf have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, 1 efc;zbc1: swtp35 dcthe 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 sukilthh 7x (las0 pdy+04qs4:dpply. In this circuit, the current0l(4p4kt0qs i sladyd h 7:h+x

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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 wb e/m0b,u-d -wokwdf4hen the frequencyed/w,ob0b-m-d u f 4kw 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 inductiven /pm0nv3.bg -ggt (pg reactance of that indnng pggtg-0/ b3( v.pmuctor

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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, t2w;c8 a ejci*i5 twc)zhe inductive reactance of that c cei cz8t)2i *ww5a;cjoil

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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 conne j2a8wxv i lns-9*7 w.gi.zhvocted to an AC power supply. In this circuit, the currentv7oa.hsv8j-z92 i. xgwwi l*n

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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 cirb*.jzjju (kv 0glx(0bcuit changes by what factor when the freque.j0lz*j j kg(b0(xbuv ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approacmm zgenwief(9lu 0q:pg6*3x(hes zero, the capacitive reactance of that capep 6x(nli e:m(fqzmu w gg*930acitor

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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 3)* c9lvjdngm the voltages of the inductor and capacitor in a RLC series cir )9d*mcjlvg3ncuit?

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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 RLxi;-o upyd +fbnnks 6qp14/f, C 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 the circuit increases if R incu70pd.h 76xg3 ebgh;c 2s8cx uydx3j2i,euy x reases. When is this statement uixce ghs2 b.xex;u8 dcdjuh637 3y7px, 02ygtrue?

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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 n)nrg: m eod+0et74 ejcircuit 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 impedancptai:9r2ocm.2 knc7f e of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance anlxd1p 7j)fv l8d the capacitance both double in an LRC series circuit, the resonant frequency of that j7) vf x1lpl8dcircuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At /l3 jfg:r8qp eresonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circu2rk0*yiwlhgd.f+ 22 ry m n.(cftmd7dit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magne(khk 6n+*l-ii9v rhqj y5 nhr7tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo h jy*l5ikh+9rn7iqn(v- 6hkr p 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;k+-2xf j3f20 aeouog) nx dpi in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti;x+x03a2ofp2 edokiunj)g f- c 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 fr7veo1es7*jm ield of 0.20 T. Find the magnetic flux through the loop when t mo *rej7ev1s7he 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 adjustabq2 m5s .ayxlb2le 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 cha5zd (1xmfor q.nges 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 wi cwmmr(ig,olie1 (9z, re 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 smw ,(oirgl, mce(iz91 , find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and anysky8qd)h)oc 6+ vqnu-, uz2r 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 ar5lfo8. biw3 4ev+qrnrea $0.20 \; m^{2}$ 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 hori,gt6ncf 9lud6zontally at a location where the downward ft9lnd 6,cu6gcomponent of 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 that is 2.0 m longji+ ;ki.a c3bm rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetici+a c ;bk3.ijm 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 hasc7-vzol+x pqonzw / /6 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 yn qt/5v+,sawe:h dpf :cx2s; 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 $emf$.

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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 armaturezkhp c548laq5tzo i 57. Each loop is 12 cm long and 8 cm wide.z zk57o5 c i84qhpalt5 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 will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirew1grx9e)1g- i4j lyec;(ducv2le; mw 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 ) exnf rv7uty5gd+*e)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 the area) gxe)vt+e5f7yrnu*d 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 generatptom9vv ,u oz4n j,ms/- y55uan)qx, hor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.0+5ry9f+ bqp h 0wwz/fs3leeshgo+b4, 0 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. e4 t6p ,td8*mcu3 wz4hmc1kct The motor operates on 120 V AC, and when runz164u8 t34p*md k thcmce,tw cning 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 powerr k+k wb6/saynw(77d (7bdthm supply. The operating currentsa6bym+k7htb (7w wrknd(7d/ is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sue,t- 9pzv*jze9l rrm esy-5 yt2o/uys m10f u2pply. The operating current is 1.0 A at full speed. Whezuy- mje-5ts9p2rvst r z9yu/mf *,0l oe21yat 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 internaemeq74(y yy*8+ dksz q +ru9swl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A eyqzq+(8sy 9se* 4+ dmkr7wyuat 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 is needed tojb*7x7o rki()gw r n+x 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 ; (zz(pad6:hjj v .velA to flow in the secondary. How vl.vz:( jj6e;h(d pazmany turns 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 aref ji+ +4u/xvdv necessary in a 110-V primary if the 24-V secondary x+dvu/4jv+fihas 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 seconda1i mdke6udr9aj/jipk *) e31b ry coil. If the current iem p9/djr1ib *ud36j)ea k 1ikn the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the pr)4 m:9o6bjsb cpck6onixq p1r f.))bzimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the sec6ckbfc)nbx)mpqis . ):6oz4 bp9roj 1ondary?

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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 transforme iza8byvc za6j/)w; t8r provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does th)8z y/ca jw atb8;z6vie 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 andv.jtbd ciu1r(g:w 33 s 300 turns on its secondary coil. If 120 V at 2.0 A is apsji: d1t3 3rwgvcbu(.plied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prima 54k (r*l66tw7gz(5gtyun 9lxscna vvry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is preg5t(lkw z nv lyv (6n7gs49ta x5cr*6usent 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 has 2sz/sl t4rg 4z500 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary tozgt45z4ssrl / 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 20f1g4+bh o -lmr0 turns. If the input voltage to the primary is 100 V, we can egf 4m1lohr-b+xpect 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 yd0 l ics+k1,wand its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the sec0 ski+cyd l1,wondary 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 vy+e-gdit; l/yhv 1.ld oltage is usually stepped up to 4500 V by a ivlyy+l;t d /gh.d-1e 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. Tvpxe6 pu0q5 4 afir:7ehe voltage is usually stepped up to 4500 V by a transformer and transmitted tepp7a6ue4r:q i0fvx5hrough 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 curr) l*m-wo hswfdj, -ze3ent at 120 V. The voltage is usually stepped up to 4500so*e lmd- fw, 3jzhw)- V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line 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 ape 0obhlh/43 dq *jug (s)a9lfy g2z9f 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 g0a9 4suh93/ (pjl*zh qdbfoefly g )2with 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 vx3j9) bfea6a,; quw- xo7agakm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy b u9 vg;6x 3a7 eao)ajf-xwq,aloss 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 a7a ( efpjb4 o3i)qgu2rt 1000 V. How much less power would be lost if the power were transmitted at 3000 27fa(rq) 4ji ebugo3p V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a z yx,*2 apfh we4v;j8pline 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 to exceed 0.010% of the orij2x8; ppa*vy,fw hez 4ginal 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 coi9 7w2ps qis;axl's magnetic f ss;2iq9x7 pawield?

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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 aw;bcpr ;;/7v qb)r g1rvmsz -vn 18-H inductor. What is this circuit's c;sb vzg7 rb1rvm-pv;)/r;qwtime 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 gsh+3zo x*1d(9e +(y vgaxw1x szeo 9jwhere 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 120y la4 twk51fx;cb,eot( *qt)x -V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-Vl4lz c-ro)0;: z xbcfz AC outlet. What is the resistance of the lamp zr -x4f):clzl;oczb 0?

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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 connec hpo91hjc v 8e-a,*ivz,* mjgyted to a 120-V ac power supply. What is the peak current through the jyzj cmi - a,9 *gph,ev*ov18hresistor?

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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 f j.mn1kqf y:msl0*kf2)4ecc power supply. What is the power dissipated:mjcnm1fc.e0)kl4 k 2* q fysf 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. 7l6-oh3y+gf erva ao 50-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 resist341se rk4 yqpt8w y8/ot e;mcwor 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 resimr ;h2i,+lufr 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)ua-n(otk y41 .- c:x x3kmqpjqsvfg3-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 inductivea hh0b/i/ exr/ 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 1.;+ aysl: dv3 lf7bi- cll nk(-azz0fx4.0-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 nece s4f:1ur*rc w q7xnnr,ssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC atv)(i d f3dcq8k a frequency of 20 kHz is applied to itidkcdf)( 8v3 q?

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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 ;, 4nsorqg7 8r2 edvqksource?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capb/lp f2z 8g* b0uufi3aacitor 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 reactax 3- nq yxm9xzu:faj3,zt0s6xnce 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 W? bbt7 ql-ha72v/jmthw3 kwr)4

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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-mFs.960cvulj vb q)c z:w capacitor be 100 W?v9v)w bsq:c .jzc0 6lu

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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 aab/i3*ae+nt p 6rm q;znd 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 a- k vveds3:,kof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reaa:-dk ,3vsve kctance?

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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 impedahcts)hwu + -/fgql/.4co5zvo nce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap sgwuvz/-c/fq)hlo. h4oc+ t 5acitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF csc6 n k+)+cgf0u p *9rlbsv)uiapacitor are connectlc+uf)uc9*ri nbvp s) 06 kg+sed 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 connecpda2e0ti +2 f2ge*citted in series with a 20-mH inductor, what is the impedance at 1000cd2ieg p 0+af*2 te2ti 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 2*khruh qekv1-jsl4w/ c;cp 4 80-mH inductor, what is the phase angle1kvsc;8ejhkl wp4-q*r4h uc/ 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 with8. a jj;kvlv)snvtj4 * a 20-mH coil and 1.0-mF capackjl n4jtsj)8; .vv*av itor for a total 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 capacitances is nee7sp :8zracqe+ ded in series with a 100-W resistor and 15-mH coil to get a total impedance of 11p8 srzaqc7:e +0 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 sersn;dv(1s, ehi8 onu6qies with a 450-mH inductor at 5000 Hz for a totn;hni(8odsqu , 6 es1val 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 must be put in series with a 100-kW resistor at 1.0-MHm,l(isu5g rgmu;n z4x)o3yh hm 4(,pzz for a top,m, r4i3)ugslmzh y hog5(z ;n4umx(tal 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 with a 20-mFyid9 3-v3kwx vip l*r.bp;fq,bc:5wm capacitor. What is the impedance at 1000 - xkdp.;5l r,fv:cw3biyw 39pvq*bm iHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is newpyy:w.zeks c(cw)zn0 l (:f, eded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of:zewf0w ccy(w,ynls:p) ( k.z 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 1i. bnz9up i;t09wets)0-mF capacitor at 1.0 kHz for a phase a izewpitt9sb9.;) u n0ngle 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 widhh xrqvo* r(,8l), mzb wa3f(th a 30-W resistor at 1.0 kHz for a total impedance )r a, qbd(o3 hfvmlwx8rh*,( zof 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. z* 0qil619 yr1qi(u q-cunap(w pujv3 What is the phaqi-y qnu iv*c a qz0163upr9(jl u1w(pse 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. c.f*dft,m4(yh;ahqb 0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connbfm. h ,yad4 cq*h;t(fected 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-mFgk0ylas+kz1mv h ls.,:. ecj0 capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the.:,zc0+j hyk sg.10ml lkaevs 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 capacitivem* ()so7ofz tz reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 6(fm oz)o7*zts0-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 circuit containingwb 3 m0gzu -hud c3.(k*zvsm0f a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when *0d330hw kgcbzfzus.m(vum - 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 jn/mc+ jo)bu+series with a 500-W resistor for a phase angle ofcmjb u)n j++o/ $40^{\circ}$ 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 m)jy,-v; ; ptjuhh. zao/b /yqcF. At what frequency should the ci ;h z/;)vh.y,jo- jcytabqpu /rcuit be driven 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 outputhnco kg 0 +5py q+)1uooe1ukk8 vn(g/ r.dcw2s in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta e+ du/pn) ug8conk ckg2o 1h. r1v(5k+qyo0wsnce, 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 cirj . - 4jwff*r/zai1vsyb7q4 jrcuit 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 3t 4sniy*;j9/j ca h0tu ;au1ss0 W. What is the power;sy*/j1 jaui4csu09 ;hn ttsa 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 containing a 50-W resistor, 7zr:up lnfd -2a 10-mF capacitor, and u f2p:z7 n-rlda 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in sed)wjh78 t7m neries?jnt7d)e w7mh 8

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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 capacit swqc ay6d y8jw*,a+w.or for a resonant frequency of 106c.j+*a ywa,s8 wq ywd 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 resonant fremrvfw7mf7 hhd57 k bc9d8lb* 3quency of 1000 Hz?h3dfmrblh58vfw *d7c mb977k

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-v bk:zuyh839 n 9ntv(emH coil if the :tu(9n nb9 vhye8 v3zkresonant frequency of the circuit is to be 1000 Hz?

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