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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 units of magnetic flux excp5vq* u/ iss0xept

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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 indl)7fmka zs 1m8uction states 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 kin3 m(3vtqd: ktnd of change on the induced td nq :3kmt3v($emf$, 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 of wire produch xz*cc1rhn 45p- ,crqask/l h.n:3nles what kind of change on the inducklxc cn- qns*/l5.h 3zphah4 n rr,:1ced $emf$, 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 whatupaxqhd4d6 rmf6n0 37vr/,pt nqpe;:4g4wev kind of change on the induch;n qx,pd g:4enw04 vv4f6umeqd6 tp ra 7r3/ped $emf$, 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 mp 2d1/ulj)s kiagnetic 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 directo,wanl fm,p.v5 xr ,7wion of an induced current in a conductor will be that which tends to produce which wr w5 fxm .nl,,ova,7pof 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 magno uuhy a2gkob25e y0t:-oa-b6et is held above its center with its north pole pointing dowaa2yoo -k-e50u h6 oybbug2 t:n. 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 baramy vjy/4s 9mouq*9v (v4iuk; magnet is held above its center with it9 vvy(9i; sqkuyja4m* 4muo/vs north 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 fiky 3llj )8s.8y7wjw hweld vector points straight up. The magnetic field vanishes w7j)s w8ky83yhl wlj .suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic f+m i4wo 1(*(c/ koyv.wpcgu rfl(go9/ ubi3uwield vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the 19w(ifom(3wvbg.y u r+/cpwcu4 *ou (/lgkioinduced 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 magnet lx5 olnjj i lgs0l9,8669r-.mr zfhitic field points straight down. The magnetic field di9o l 06.jl xs ,-5ljtgz rn9im86flirhsappears 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 horizontalvi(zc8yy yk0, table and carries an ever-increasing current northward. Two coils of wiric (z8, 0kyyyve 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 loo,s15r5 hhoh(a2 0tgjeif6dky p of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (h jd2h, r5ktah5 6yi 1e(0sogfas 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 angulw)4 is7nvd 03qng, pwrar speed about an axis whose direction cagpqw,7r vn i43ws 0dn)n 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 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 aa wm ew*/y)s*r. / nd)qi-peehngular 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 of rotation if the )/aprsd-w*n/hiqme )ey . *weinduced $emf$ 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.sf xv+gjie. nb.fls50tprzj --2l):e
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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 kf7yo8+tg +7 jh)xr ckthat 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 roiq63zb.s)uko0j7zh(9nx ricynk 5s(h9- va magnetic 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 gyov3 cfg1s+f,-q *mceast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentiq ,-ocf *sfcv3g y1mg+al 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 angm.k*w2+6k,5 3rhclihfa j am nular 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 transfou4p *7uqb xlw7 yrrd8)rms

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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 secoxplr sj9cukzf52xo 0(+27cxcnd. The frequency of the zux( fl52 c7sxr c2ocpk9x +0j$emf$ 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 devi-fil:r afttmrw54s: 9r prp m:35z+y ece used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thax02sf(;g(u, bt mye nvt

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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 the -dm maoc3ykv* ,v,4g jprimary coil then*kc v-jo,mgdv4, ay3m 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 .b svabiz1(rf : 9 hw(vl6mkh)loops than the secondary coil thenhkabhb) (1v9:v6 zs il(f.wmr 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, thc.fmoiun t/k(.*k0 z isv s/+f y0xlg9e 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 resonanjwmxo4 .n0 -jdt circuit,

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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 cob f* o9ukk*ug6.6f7vmkac- -kzq6k/ cn osb+fnnected in series to an ideal battery of constan-6f ukgs7 kzk+-qf */okb69u f6nc.*mk avcobt terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indug .ny hiu0m+d+ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor isgh .y+ u+idmn0

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an p6pt*a udl ;, j8r.xox$emf$. 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 induct9.fir:d o+dlk u*dn2kance 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 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 timeq m jkb7+- +b6.li kg3 al4s-wogz5kkv constant for the circuit represents the time requirb l img.43 7kgkw+azskb+-6 oq 5lj-vked 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 batp-n dtj bi-q(m*t7s+ wtery is suddenly removed from-tmib n qp(7t* wjds+- the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same v)a cr81w hx o2dm(-mvunits 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 zk; mng2l )us:9i h6xjcircuit, 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 Ako8b0/lf1f 0b )vxgkl nq+oi cgj.g0 b/b:z)xC power supply. In this circuit, the currentgiogc g0ozl b)xqv8f00+b/l k)f1bk/j. b nx:

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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 1 icmv0(c u 0c73vpsfgfrequency is trip3pu 1i gv00cc7(cmvsf led?

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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 inductive q w i;74nqgf3hreactancq ihfqg3w;n74 e of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage atfu8t z8h 03g0md)y jocross an inductor approaches zero, the inductivezujm0y )t30gh 8 t8odf 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 csl)cm m i85vim1 4y+ffircuit, the currentmfi ic vym+5s8m1l4)f

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by akk2k*x xfk3uw s *o1hkgp30:what factor when the frequency is triple w3kg*ko1k:2fh0 k3kpu xxas*d?

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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 ak 1q:qjz9uc 6ap368r edzd2a upproaches zero, the capacitive reactance of that capacit cap38:jdku9u16q razzeq 26 dor

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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 q5mcd2dw1e4h voltages of the inductor and capacitor in a RLC serie m2d5wqe4h1c ds circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an R+2meo-b dbl5) qp) u50nube zhLC 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 circu: xjbhr 4lt;d* bhy-8cit increases if R increases. ljhtx-4; d: y8*chbr bWhen 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 circuit. The impedance of the circuit increases if 0:* nqs6fwlv.mt9 ,+bm kjora$X_L$ 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 i9ug6an v8+4dt8l7j +pkwg vw the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance bothp8 kvr3q7796jjns6g y;e lekv double in an LRC series circuit, the resonant freqek9vpvq3je6gr8 76 7 ; jknylsuency 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 by an AC applied voltage. At rez)7c kozsk-5q-yj)r nsonance,

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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 circuit occkss)pnl4 6(me5s0h bv urs 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 rotatinc5+((z djus lsj:0faeg in a uniform magnetic field of 0.20 T. Find the sz5+j(jaluc :fs 0d(emagnetic 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 radiusblxf3d7i b7tijla9 :fo2s - t*,rf9un 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and airfx2*lf,j:3 fn7bubltito d9s 7- 9 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 ra( lad +2-dsimm v h8h+fw:hfs;dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field2 +;v: sihsfdmm8wl(f+hadh- 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 c 9d:-tz1 kaamarea of an adjustable 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 chaenl7v2rnh)nr0tzjo b1 /e3 1dnges 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 sr-fy;6bjc0 mmk z8qe7 ides 18 cm. A uniform mac;7 e kjy-rfm8q0b6 zmgnetic 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 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 anxvn96ul oo/l61 rvhj( d 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 area91b9+ltk t br o)+ k5cymjwf0i $0.20 \; m^{2}$ 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 horizontally at a location where th l1tgcf rdwke16 j527ne downward component of the Ej251 cd6nrk ewf71lgtarth'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 k8my:f j d h+q3m86t :u*bqpt,+zfkiu 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertic68 y:z * ut3tm fjbkdmh,qq:upf8+k+i al 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-sec,w hy(nm0 eon.ykza 56tional 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 turbup 7ifli75r-7* olhhns 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 is 12 cm t af1 lvn1pn-hzs/dl0+ +2e zplong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates s/dhfn lv+t1lz 2n-apze0p +1in 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 wire of ytg23 h+ct3 m-a6 ffgharea $0.090 \; m^{2}$ 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 t.y 1ogzf)u yk1qd,z -to construct a simple AC generator with an output of 12 V max1uf zt d1gkz,y) .-qyoimum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum cuf57ap6q 8b a$emf$ 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 resiyam rzfyo l u;9tvbb2 3.n)oj+6+d0 vjstance 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 ,7x3e)qwqq,x-qc b itr *4 hxrhave a resistance of 6.00 W. The motor operates on 120 V hrq7ibx3 *xt-e4wq), ,q rcqx AC, and 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 resistance 6.0 W is connected to a 24-V power supply. z,pn6vnd+,iymn1 t1p:cj wr* The operating curre mi,1d6 :vpy,rc*+j 1tnznpnwnt 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 supply. Tv2n+48 wouh :md3hk*q4qbpjzhe operating current is 1.0 A at full spee+:jn4ouqbkd h3 *whv 2p8q4zmd. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected m 0x2mhltq8)k to a 24-V power supply. The operating current is 1.0 A at full speed. What isthmx l 28m0kq) 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 needed1us+k)itpyek a,d n8 b s+d5;v 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 :jg frc5fh(+f ibv:o45quv1j secondary. How many1qfjv(f5:r4 ogb u cf+ v5ih:j 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 are necessary in a 110-V primar *nyy5c:vtg( xy if the 24-V secondaryyx (v5c:y n*gt has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seci9i s:cja,+j.ijy354 gqdsw fnx 6e+condary coil. If the current in the secondary is 3.0 A, what is the current in the primjsi yew,+qj i5s6cc x:9.3+jfi 4gandary?

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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. Assl,6jep0 oj0 5g orpqa.r1e4hknwu//auming 100% efficiency, ho gn0a/kqe /hlj o e,ju 50o.a4w6p1prrw many amps 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 wq2sdw; h, hl1+fhtn. neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primlwhq 1hfs.d+,n ;2thwary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its 5hpactvn uy7qsk jsq)0* j.-7 secondary coil. If 120 V at 2.0 A is applied to the primary, yu5skc)pj-q*7q7 .0 ah jnvst 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 13p2uvlnhy 2c 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secohln1 23upcy2 vndary?

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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 gmb olyl0cco:2br;4- secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secogc -b20o ocl:;r4ylb mndary 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 trans qc yc)3 cc;c5yxx+lf9former has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the ox3ycy cc5+lc) qc;fx 9utput 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 ha(j0y4vb5 e dh e3tzm)hs 100 turns and its secondary has 200 turns. If the power input to the primary is 100 eb4 z)jd05 (hmyevth 3W, 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; xojhc:co )z; A of current at 120 V. The voltage is usually stepped up to 4500 V by ach;;zxc)o:jo 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 o9, +i776lwn uslwsenif current at 120 V. The voltage is usually stepped up to 7w67s,iesl n9liwnu+4500 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.

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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. yzi bq9 gi4(p(n, ez;mThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not st ,;i z(nz9(b4yigemq pepped 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. )) z,xm: gkauo 8hma0jzqcf ,3A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltq3z0,x,fj a:azmo8 ugm hk)c)age 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 resistance of 0.60 xomtdxy57lukuy7 ;1;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 steppyumdx; 7 x1;tyluok75ed 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 ph2 l l2v5yz,ccyz6t:r zw (o/power would be lost if the power were transmittecv 6o2l p(5z /hzyw,:2zctrl yd at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at bu d5(ht6()oz*zrlir 20 A. 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 powbt*(iz(r5 h6lz d) oruer loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of4)h**w* lyxzztlw 9xk 5.0 A. How much energy is stored in the coil's mak zx*w xy)lw*9*ztl4hgnetic 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 1wdlh. 5f2y9u e1 evtg18-H inductor. What is this circuit's time con.eyuh e1w 5f v12gld9tstant?

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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 voltage25o1nh/ nuhsb 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. What is the peak current ksegw9 ,+gu;*ev5uxw 8m ,nwj?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistanq: ylpm..rgi(l9+id o ce of the la: +.q(9ygl.ro dii pmlmp?

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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 sjpu;8eyww3 0w8s8hiqupply. What is the peak current through the resistojq8p3w w;8hi8ys0 u wer?

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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 ,u3qpq7cu 9t- hi .htya 120-V ac power supply. What is the power dissipated in the resisqt7 9, up3hq. h-cytuitor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resimjjvu0hf b7yd 5),b 1tstor 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 7er xh+f y)ku1l1sdl 550-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i 949 *esv0tze emfa/q*7vcx eus $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor u;qzzgq/af;l i67:gk u(e c,rat 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-m eugd+4dr9fg 9H coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W y5:m+yn2t 1m7h/ zaqz zv tv;nof 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 necessaryl;vxb p 8 :sg5wutej+9 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 at a frequency of 20zx elv5er+ k+3 kHz is applied to itv r +lek3x+ez5?

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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 so9 d04cuznd-xpl;9.x /t wf6wpr:g vorurce?

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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- u53:egrnqyjgl *q k 9-g2kev1mF 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 h4b k :xdgvbhi8 2u6;cbave 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 10-9k:i(1g kaju( wn ppb6mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor bw km5ai3iwn;f2 8;ro qe 100 Wi3 a5;;2w8kinf mqwro?

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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 througxmoeg/i6t3+,;pok lwq t :aph,i0 rg2h a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuicjukyeiw;/b z2 dv-j )d6 nva+xm5 ;-gt with 12.0 W resistance, 15.0 W inductive reactan5jn-2;;d6u-avywzjm xei) / v+bck gdce, and 10.0 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,d2 (qr3bu/*rmwrjo 6 m 20-mH coil, and 1.0-6mbow3um/r 2jd r rq(*mF capacitor 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, 2rg ky1d;7 ,;y z.sa+ao ji2gjh0-mH coil, and 1.0-mF capacitor are connec k1j y;g27hz.,j ;asgir aoyd+ted 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 resistor28rso+a * ra cfgixlphc+uh-)13 jy8x is connected in series with a 20-mH inductor, what is the impedanr a+*s )8x y+3fa8uo 1l hp-icgxhcr2jce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a6 t mfu kr *)/domb+/rnug*h/g 20-mH inductor, what is the phase angle at 100)tubg6/*h/ kmm r*d+ fugo n/r0 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 ()x6 mtkm5zil k/7+ bwa hry1uand 1.0-mF capacitor for a total impedance of 100 W auz75yi1m/m l(6br)kk+ axthwt 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 ,mayzp8ditq:fc 2n/,0 ihb8 rcapacitances is needed in series with a 100-W resistor and 15-mH co0n :by cf8mdh8,patr qii2,/ zil 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 put in series with a 450-mH inductor at 5000 Hz fo+c qa:cxz z p+vx*1az0r a total imp cza+zax+:xpv1 qz*c0 edance 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 hyrqd96*ladv3w b,; rwith a 100-kW resistor at 1.0-MHz for a tot;r 9l*bhdrvay3q 6wd, al 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-mF capafy+*hx+ dl5qase - kr.citor. What is the impedancehasld*kx ey.-++fqr 5 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 for a tohi go*1h7zg )ttal impedance of 45 Whi) h7tzo*g1g?

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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 wio3aqp). p1l rug 4 cmh*:4xfdtth a 10-mF capacitor at 1.0 kHz for a phase ang mha .g4q3dl4x rp)fc*:outp1le of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz e))s vfp if.s(d60mas;m -uvu for a total impedance of 45( )s)miv6fe -a;sfvudsu.0 p m 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.rrehl7;0 o,y klm;1ly What is the phase angle?lr07e;,lr; yyh lo km1

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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 7 awczp62hn m* y v sov/7,kmi6ltf,m/5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conneo *,l7 fiz vpysva/ 67mm,c/t6hnm2wkcted 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-mF capacitor;tjfi(31w-dvwqju5j ++ bq f c, and a 0.350-H inb-;w+j(1 +fiquvft j3cjwd5 qductor. The circuit is connected to 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, a capacitor of capacitive reactance 30 W, and an inductor h4d(jzoz/ on. of inductive reactance 30 W are connected in series to a 1d(zh jnoo/ z.410-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contljvj::1vd d6u aining a 50-W resistor, a 10-mF capacitor, and a 0.45-H i jv:ud jl16v:dnductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in serienr tw9rk q3p5,cerp/qvo+ 4( zs with a 500-W resistor for a phase angle o/+rvp qo e( zk5cr9tnw,4r 3pqf $40^{\circ}$ 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, o: (yjeh/dl :tzc 4o*arvr.76l/*p8iyglcdrL = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tr7li8o azp 4c :hyv*td.od*l (relry/rj g/6:cansferred 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 resistance, 15.0ztqqa 44m(-2a a51fza.d gbbi W inductive reactance,fagq (qti4bz.m5a1 -4db az 2a and 10.0 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 -m slq(zgbd5u1(y(e iy pc-,fAC 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 od .yl 3(ij y0jl: o;dmv.xfw+lf 60 W and a resistance of 30 W. What is td:+mwf i3yly l0.(.vjx;jol dhe 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 factor for a series RLC circuit containing aw. *n2 egve/q)85jni alw fk:q 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ewqv a8gn/.j :k2fwniq le* )5to 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 capa;cn pig .m zm5a/nd64ucitor and a 15-mH coil in series?a; g.c z45pdmm u/n6ni

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neev2ls t9mq0s.1*/p l. towlfwu ded in series with a 4.7-mF capacitor for a resonant frequencmvq *.lf1w. s9/ us2lpt0lo twy 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 inducto (eq *)eh k-l9i rvric.x)xb8rfx ko8,r for a resonant frequency o(*-ovki), b9ixe kflr)r xxhce88 .rqf 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 my+oeh li(hn)r+ 0x ;xq uv4, 5is/ciboust be placed in series with a 30-W resistor and a 40-mH coil i ehhvu,5l+/r4 xqs)i 0 io+xn;coi(byf the resonant frequency of the circuit is to be 1000 Hz?

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