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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceb(qgrl o:f* (m fp.j.upt

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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 st. xe*+-7inc4ph8xa/ylrf9aedl pi5mates 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*bss o 9n/ah vtue;47d wire in a coil produces what kind of change on th;avts 4o s*/dhb e79nue induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of o fy p ,b*+4i*k2rzzzqthe magnetic field through a loop of wire produces what kind of change on the iqpb, k z+ri2 *fz*yz4onduced $emf$, 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 ++zrwd9 p,f ytof a loop of wire produces what kind of change on the induced fpw ,r+zyd9t+$emf$, 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-efds v 0bf(+ tea0wz( 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,-mo5nka, j0)bpykf g/ the direction of an induced current in a conductor will be kjo5mp bfk -na0yg,)/that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fla a1 k v,;vg5gpo7z/myy;abe+it on a horizontal table. A bar magnet is held above its center with its north pole pointing down.1m; vbz;eoypa i5kgy/ga 7,v+ 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 liesucb7pi b/vl--fj.k4i flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches thkf/- .cj-blip47 bvuie 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 vecto0szn yv,dtk; 1r points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this co;d 0k vz,tyn1sil 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 vecs1a q+ hll,7jwtor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases? l1haq7ljs, w+

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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 re0knv/hx +pqh96+hzt *zvm(g ygion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direc/9+yzp(gk zmhthv *nxv06 hq+tion 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 n bvfk5y c-9x.q,7.m8bqew4sm 1hb getable and carries an ever-increasing c.qe m 5x4bbks89-wf .mghq v,e71bny current 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 witz wxwjjec ;a,r .31hc-h the north pole entering first. As the north pole enters the wire, the induced current will bewajczhc. w j-1e 3x,;r (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 ur7wh e/fxa)/at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wha we7a)r /huf/xt 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 rotatcd23y1 5n97g0 jz0t/jjzf4luh6buvfeh5u zced 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 of rouj junh6z h c7zl v45e10 tf/dyfc0b5jz g329utation 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.i 92 e*xeudtx1
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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 t5n z29vjudb zq.7oui8mxr 06mhat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Th5:mv *ta puuj gdmr4b f.po 4ge,a;04ke $emf$ 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 eas7(5w p)kn(oq5 wszgh zt-west direction) is moved northward at constant velocity througp57(ozns)zk 5wh gqw(h a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloci)lv ;+c a;8) ypnsbcchty $\omega$ 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 tra0zb(2v .qrsa pttp e 8-4tixa1nsforms

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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 seco +4/(wjxouppand. The frequency of t/x4 +paoj u(wphe $emf$ 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 devic) l03sewo.xpbysnat0 kwi7 50e 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 ti5-kc b2e0qdnhat

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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 t;v2cv p e+ci2che primary coil then it 2cp2 e+vci v;cis a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than th5,(n zt zhub8f2n0xsge secondary coil then 5 h8(nutzgfb0n sx2z ,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, theuc brjrr -:.8o4 kq9(lu7v +qfkj wm;p 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 circuit,m 6w/ddh/qup.u/ fsg -gexo8 1

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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 battlbid4quj3-p5 ery of constant terminal voltage. At the momeni b5dlpu34j q-t contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cnuzkpp 1,(jx;iys u ,:u nd94bonstant terminal voltage. At the moment contact is made with upp9b i;:nju kn,sdx u,1y(4zthe 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 resistance R is connecte)dn(ydd )2 dsrd 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 rw*d ( ia ;n30bvmscu*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 serjuypt jvh t31tsc1 itrxv:( i) 38,;hiies to a battery. The time constant for the circuit represents the time required for the current to re3tj(iy1),:81pvutt3 hrh x vi citjs ;ach

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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 inductorc hxt y5*t kfh)p:y4l/a8kmv7(vs(cp are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for thecth:cha(7ml xp yvp*k y/sv4k 85()tf 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 unit 4-k-l.ieatwls 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 pow )t;o*uw1u2/higzd(dhwn s io8u q-1ver supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supplja,1vp ft1.b4:w i kfuy. In this circuit, the currenp1j1i.ut: awb,kfvf 4t

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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 tdx reiypxs(b-lde1f- af8 k; (ha+-9phe frequency is dskaad iep8r+fp; --e9 b(xf- 1lxh(ytripled?

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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 n4 xcqgel,08vubled, the inductive reactancqgx8,v4e0n l ce 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 thedemoe ,s67md8 AC voltage across an inductor approaches zero, the inductive reactance of that coi7 6d8ms,oemde l

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the curr6w xn,,hhl/oyez m 8k2en6h,l ny/ 8,wh2zokexmt

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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 cha(bo:tchmd6 9wa7* mbn nges by what factor when the frequenchdn oatmb9: *mwc( 76by 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 vol :ilq 7f qotuk,i ;z-zuv78baiod: 6q8tage across a capacitor approaches zero, the capacitoiazoliub :qd7 q7v8qz,; -i8 f6 :kutive reactance 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 th wopl,wonajb1 8. /-pqe voltages of the inductor and capacitor in a RLC seo1/ plnjboaw p w8-,q.ries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is d3qofm+klx: g) efined 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 iw(+om1ulwi zge( qet 7/ba3: hncreases if R increases. When is t gau1hqe7wl/e(zowi b m(:+3this 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 c:iej 6 p4-mp7ru)pd qv*wy pu+ircuit 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 twnxll-zd . :-vhe 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 capa 2e6cgn x.s-mu6zut vpwir ,s1,g ,u*hcitance both double in an LRC series circuit, the resonant2ggsh u,xu,si r 6mw-nv. 1uep6,zc*t frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circui4z x(u5 j -ncvfc(dtk9t that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RL *p 8by-fi-anwC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielc 5w:q:c swgd;sycl3:d of 0.20 T. Find the magnetic flux through th cw3yq :d: cl:cs5gws;e 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 uniform magnetic x ---7hj4yd. um ti7 gjur/iq1i1rfolfield of 0.20 T. Find the magnlm- -oh.j7uy u7/f-igix1r1i t r4jdq etic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.1wu46g cy , t ptu5wrj/,kova(70 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flu7uajyow6, tkv,g pc5 u/ r4tw(x 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 adm+s;b6jy1wp 562f6 arcor pzg justable 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 co y) 9xvvj:bh(bil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squtj. 5 e8jghlk.are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chaeg5k.j. ht lj8nges 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 and an area of /mep 3g,x5un. ti)u83 iwnus u$0.40 \; m^{2}$ 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 arev3e5r 4;hg(e -;hbtkgnkog2 n+)n eioa $0.20 \; m^{2}$ 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 o8*3ox5wp jo*y9lt mzf f 60 m flies horizontally at a location where the downward component of the Earth's magnetic w pt3j8*o lzox m5f*y9field 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 at a constant angular velociq6gg5w- akc7pty of 2.0 rad/s about a vertical axis through one of56q7- ac wgkpg its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of3dw.3e ia0 tz7egit.w $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ofjq+fe(ena71 g 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 iiei- xvk gb 3m1uim+55ts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis paralle-iv5ig 3mbuxmi 1e5k+l 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 6 rzumo2 kkjtw(m) ,hwi15,akwire 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 12ybo,po+ 3c:o jnnkno 1(y 9q5aw hfv37ns*q7h V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotas oqq o5wj7 7no* yf,3+n no:(habnvp9cy k31hting 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 gylr 3-kf tc*q0l7v5o9x 9qzi $emf$ 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 6.00 W. Th.g 0ci j9ze+sws+xs03kgo ;lze 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 opmo8ln p-53(i ban(f lf 6.00 W. The motor operates on 120 V AC, and when 8 omi(p- n5lfl (3panbrunning 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 suppe:y4pcn8)rhxg0xcy (mo gu *+ly. The operating current is 1.0 A. What is the me p +o)gxc4ghu0(xn:8*ycr y 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 po9 h8lwf1r8 fl9.wxjfmji4fogy1 8k/ x wer supply. The operating current is 1.0 A at full spgf4 rx8x/ m o18lw. fhk9wjl9fy i1jf8eed. 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 to a 24-Vkiu4gco4k9k 4z 4wzlfe i3l5w: :hm)e power supply. Theiwoe5l4l: 4g4fc uk :9h w3 zik)4zmke 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 is neeg g6py1) fp16s2 u,rj xn pkqv,d rjewz/3mr00ded 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 sefzx 45xf1k.n1qahd9b j/g,l jcondary. How many turns are in the s 1khgxff5d1 an/ jx. ,9bq4jzlecondary?

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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 th(e6p qa2-d ais 1yps8ae 24-V secondary has 1qi ds 62p8a-p a(aeys100 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*pc6an5r g.e a sl, +zobt *0g/ux(qhy-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what +t lyerhu.a*o0q(xas,/cgb5n gz p* 6is 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 primary of a transfb 8 zon0w.f57tbbr *qformer. Assuming 100% efficiency, how many amps at 24z 87tbwbf5 . qf0orn*b 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 t f/on5 xqvdo9 pn: 0ees 8s*6gd3,bbl5+qswfa neon sign transformer provides 7500 V at 10.0 mA. The prsss0dpt+g:9b5leqd / b f wen56,8*oo3fx qnvimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns4y+zxts .p9qrej / bq+ on its primary coil and 300 turns on its secondary coil. If 120 V a q pbs/+qz+j 4yter.9xt 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 onrj 6jx 6/qp.f eqy7 my-mguguwoe xc21yh9(-) its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarymfjgqyeuu7w 6g )qc(-r 61j/ xh2 yp.yemx 9o-, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondal9 ;-de8bh7le1 s 6t mqn2yanrry has 200 turns. If the input current at the primary is 100 A, we can expect aye-21 lhnnetb 9 8;s dmlq7r6the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconi5rt11qra0rq v me: s3dary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seconda stm 1rvq:1aer05i3qrry 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 200 turns. If 50s1n+dmfve uv,e t8lyb+m e9the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional nmb ,9 1ee+5ys0ufvtl +d8mvelosses)

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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 curreni 9-5wijasv 3tt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisijst59v- a3i wtance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage 6c ( s3a/iphs 8n6)flkle chl)is usually stepped up to 4500 V by a transformer and transmitted through a power line of total ress86ianp)sl f(l l3/6eh k cc)histance 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+btojw r,;fe:tjvi; bi5 w* f0/dg:lu V. The 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 tevoj , b:l f5ti+tu;bfwrig*/ jd0;w:he 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 h stdv rd, j8/*mlkvj,4as a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?tdvmd *,48,v ljr jk/s

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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 fzak5/sr1oz . has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, .okzsar/f1z 5 the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1003q3ed fear gs8a)1jl 00 V. How much less power would be lost if the p0f g)3 d3a8arleq1jse ower were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. , ,zqi3sxwa4(xpb 57is wj ,nkIt 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 tazin( 5qwj7w, i4 3bk, xspxs,ransmission 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 of 5.0 A. How much energy is stored 6)+ xbmau7l.y55i r7 eodqqv yjmhm 3*in the coil's magnetiyjeqx6l7m5 7im5 aqv bd ) h3o.ry+um*c field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H ine)9uotgclsbi84t g zx7)* p9q ductor. What is this circuit's time consta7b * 98iozqttx)egp)gs cl4 9unt?

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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 an0f 7 gmvpua+pwn w2gcyb 7;mi3iqa-jo76 .-am AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currd j5,5dq(m3 kuu(c)rqd0 mdgsent?

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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 o :94y2p11x5luzysrrl 1jg fqgph5 o*zutlet. What is the resistance of the laufp5lj 4ryp1s:r 91 goxhyqz2 5g*zl 1mp?

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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 conifinakknp+ 8,bu +q0b;t1rr h9 e9-zcnected to a 120-V ac power supply. What is the peak current through thik,-bp9f b1n 8+9i+ea;rkznu rqc t0he 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 supply. What-4m 4j ozq;i+vwqwd m7iq)4rp is the power dissipated in the rwiwqm - ir)d4qj q;4mzo7v4+pesistor?

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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 v+ j ke4swlc(m p o/*obsl5w9:50-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 resistor is rrk2rb5z:o0n$I = 0.80 \sin (240 t)$. 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 resistgld mysmsol8 cw )q7b 8:bi;i:mx*p2 7or 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 hjjn1/7(r aquas, s:k1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coiu)t/e2q rfv wt;ot63 gl 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 coanisnx x59 nn,0j0r c5il have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanv o7xf(s- xsf9ce 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 when2i ,*ekzzbv 5z1wsa. qo3r2zz 120 V AC at a frequency of 20 kHz is az3wz5 .zzavq*2skzi o 1eb,2rpplied 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 coilzr oo7 vfb52tepsyu7 c.4g(*d due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactamp(r4 3cxxt8)phhup :i0-+oxt2 v rnnnce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 w 61oqf05vd hjczyl*y1l5r h- 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 ofra oen9+zv a3, 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 reactanc./n2m3 bqdr v, .vq,):qn;n mncgowk gi6i:pae of a 0.010-mF capacitor be 100 W?, :q.d oiiwp)k:qv n r2 nqm gngn.;,bc6a3vm/

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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 capacitorn3z;6xva wk d/ m0 n0nyp2shj8 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, /.dr2 )5srmgzyqfph41+yx qf 15.0 W inductive reactance, and 10.0 W capacit4g1zm5qr2 +rqf/x.fy y h psd)ive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH co;zobe +,l6pwvil, and 1.0-mF capacitor are connectvw+6 e pol;zb,ed 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 resistorc0bzs e6l1at zh*mm ue- uc842, 20-mH coil, and 1.0-mF c se2hec0 1u*a -4lbm zc6umt8zapacitor are 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 i:0 4usx3/w aspj/ uobbt2c6qo s connected in series with a 20-mH inductor, what is the impedance at 1000 bo w:uo2tb//pu scqax6s4j3 0Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inr0mf 9)ysv-iq5jl u7yductor, what is the phase angle at 1000 Hzjq7 y-yum5fl9)0 risv ?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capaz ryjnx1ox5p-8 n ovg59r yxe (n/c-,zcitor for a total impedance of 100 W at 1500-czzo g nn r v,9x1p(nryxx55 8jeo/y- Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wk3gp7u 4u ar5xith a 100-W resistor and 15-mH coil to get a total impedancpk35u4ar u7xg e 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 sf+5:.jgolt k5000 Hz for a total impkgf.+jl st: 5oedance 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-MHz for) o9.ajh ywullpsz(1 tvf,p; * a total impedance of 15*zl. (pyl) ;fhsa w9jp1u,t vo0 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 capacitor. What p.v cw e.-eb2yis the impedance at peycv e-.bw2. 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 inbmype.0qs 0mfhng2; y4 /2e ed series with a 10-mF capacitor at 1.0 kHz for a total imqmyeseb. d; 0/emh f4pyg2 n02pedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with dz j k *pgltry aim78z7r11;(ua 10-mF capacitor at 1.0 kHz for a phase angle of z(kptjdi *r7 8lr;azmy1 7g1u$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for ziv8k8zbs0:ga total impedance of 45 s8gzzi v8:kb 0W?

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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 seriesa f ssx:9wo6l5 with a 100-mF capacitor at 120 Hz. What is the phao:sl5ws6 fa9 xse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 15000,q hfz 0;dsyx Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect0 h 0d,xfs;qyzed 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 capa sd.y1m 1u*yf8o:gssttzl x*4citor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the r18*uxsgm:ldyoz4t.yst1 * sf ms 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 reacv,n4v;6tce bq4 kjz)lk 48ehou 7 qr+utance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power cqu4brt;467+eelhj8 vk 4)unvzok,q 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 an ts*fo0u.g0 vye mqvg,8m:p2 dgle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hm 0pfg 0so,yte*2g m qu8:.vvdz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phasd pm(-w (.fk9sitzva: e angle om:sa(-t9v zwikdf(. pf $40^{\circ}$ 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 = +u-obt*fu ia ) mvtm:/200-mH, C = 10.0 mF. At what frequency shou o/*f btam- vmit+)u:uld the circuit 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 output in an ac series circuit fut9m33mz hnkz+5*xamr.i b *with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the ci n3 mb+am*9u.*tzfzhxm rik 35rcuit 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 circ w+ s2 tnxz9y:w7fhn1zuit 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 Wzy.tc .tot q8s 2/8hvp and a resistance of 30 W. What is the p82py zto /h8t. qsctv.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 containing a 50-W resistor, a wvrl(+kn qq(buq/8w: 10-mF capacitor, and a 0.45-H inductor, whe+(:nv(kr bl uq8wwqq/n 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-(hs0st* 5 fym ;sq*-i lvv9olemH coil in series?slss; 95h*(ov vqf *0 eyitlm-

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n;ev *.e2 ex)n8yrp8u)su8pe. ljjvzv eeded in series with a 4.7-mF capacitor for a resonant frequency of 10e.ne z8)8ev*.uvj xrj 2;e8ps luyv)p 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 nep 90 kajmikc 2hi2w8h6eded in series with a 3.7-mH inductor for a resonant frequency of 100m6a28 cikh9 kipw2 hj00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH cy 08gkzv dl6)uoil if the resonant frequency of th)yv60 8gkudz le circuit is to be 1000 Hz?

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