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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(i*6 :.ujm+eslznk e(ywz gz ) units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction sjn/hv 0j)t .uwtates 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 ch /-jca+nq k2toil produces what kind of change on thqk/+ -ajthn2ce induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop ,94lui ef4..mv,xg0 y qsekgn xbll90of wire produces what 4s0migleg4x,xu l,.ve l 0y fq99 bn.kkind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kine ox- q o*4uve.6*ipb4siul5vd of change on the induced eo*4 .5euo* xu46v-qpblv isi$emf$, 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 ma e 1dybs5hzh 84er.z /oy(l-v,fiqun+gnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a couns2g9 v/3z uknductor will be that which svu/gku3zn29 tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal taofmpt fl cp,0tl0w2 (*3he2x0fb5ahyble. A bar magnet is held above its center with its north po0wpftta5b ,hy2e0 (fx* 0fhl pl3co m2le pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. pma u - s. t/nldc-b;ouv8tq9- A bar magnet is held above its center with itvo-t n98st- u mqapd./c-ulb;s 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 whereh. uf8asd, xrxr1.jq/ the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as 1f./8,sd.ar xujx hrq 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 vg2szhr- 75dq a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whez7v2dh r-q5sg n viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fiels8fuw gas x )+kakl.06d points straight down. The magnetic field disappears suddenly. When viewed from above, wx)0sa 8usglk6af k .w+hat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tablezey.i ./snk2t and carries an ever-increasing current northward. Two coils of wire ls tz /.y2e.nikie 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 nori-gb59t*t; 2 u8g tspk)ccylhaz):w pth pole entering first. As the north pole enters the :z*t5w)gcba; tyg 8ui-h)s lp9kt2c p 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 jylch0a /4o,o angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,ao/jh l,4yo 0c what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed vqs n*uexzz6+9/ 8pov about an axis whose direction can be varied. In a region where a uniform magnetic field points straigh/ousq 8x 9nvvzp*e 6+zt 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.l3 c+ign3v4 mw
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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 bbr hk7x (t6l0that 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. Thekna y9wy07 ca) $emf$ 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 northwarg alg4)+j u*gqd at constant velocity tqgaj g4*u l)g+hrough 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 at1q g ,/hyt9t7; 3r0 cgj,tyno0qzxcsy a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformm,o**et 7gu z aqk0(dps

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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 throutk9ji rbjm (c656m:q ygh 60 revolutions each second. The frequency of the 6 5(6yqmk9jmijtc:br $emf$ 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 devic8*eb qv b7vu,re 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 k4p2zai1b44oo +34rw s4c sk9wpu ohg that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the sec5uhxxwe e )x *kt: a2f1ugu+h/ x+3ke3bjy. eaondary coil contains more loops than the primary coil the xg *3uh1 ehwx5++ 2x.x3)eejekfyk:bua t/aun it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than ( znclh(w+p: kthe secondary coil the+:(nkhw pzc(ln it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpa to864vsl w (0a-q1jwy9vzwput

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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 circ*mjgs2 lwadn f37r 2)quit,

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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 battery of co3lhs f*d5jeb fuxi lgq7w-/+3nstant te3i gle wd fb u53f/7-xs+hj*qlrminal 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 inductor are connected in series to an ideal batte9z wyb 2kyn;3iry of constant terminal voltage. At the moment contact is made withznw3k;92iy by the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R aqh69xgf h0knu/;spt6 m .m5d 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 resis jm9w,mfzo)j v 8,1)gpkw4nsv *de)e etance 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 seriesccj- e3 9n*aq loj)vr7 to a battery. The time constant for the circuit represents tcrvj)q9 o3 *nlc7ae -jhe time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batte5ifug c2);nrq ry. The battery is suddenly removed from th;rq5nguf2i)c e 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,k nn x, +m,7:gzswv prpe-,xa 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 ahu64s s;atj 0wn AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC( jf+hc45:u1hvldzcf power supply. In this circuit, the currentlccfud5:+4(1jzhhvf

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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 90c(z0*rc p-s1 eq tl mmmsroau(s o23by what factor when the frequency is tripled?9ec*2r o-03zus s(1sm oqlcrm at0(pm

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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 9 ef1e6yryq05c uvt7m gji.f(the AC voltage across an inductor is doubled, the inductive reactance of that inductor(t90 rm1.f7ecigyuefq6yj v 5

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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 approachegj o,6ru .c0wss zero, the inductive reactance of that c gwj.,6cr 0uosoil

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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 powe p3dq b+r:k 36xtfb)r-9unhvq r supply. In this circuit, the curre93bhd )tkrb u :-pq6xvnq +r3fnt

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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 what factor when the frej .jrj wc7-oo1quency is tripled?71 co-rojwj. j

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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 capaci5*+o0u3mucxr+ xoxqwe)j4kd tor approaches zero, the capacitive reactomkc+w ur+xoeu3dj *x0)x5 q4ance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor 2*qui5wxc)he45led va4 +mez t+g-hzin a RLC +)gz2qece u5m5d zwl-i h a+th*e4 xv4series 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 defined as +27qu9o 0ba;o cynrv 3*krqtn$\cos M = R/Z$, 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 increases8j*df6ez s 7pd if R increases. When is this statement true*8j 76edszdf p?

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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 tvq3/fh1i8x) bix9 xtvhe circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The imped;c3c d7-tv:sscz5ll d ance 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 and the capacitance both dou.6jph/ n flu-afmha *,ble in an LRC series circuit, the */afam.jhp ln6 fhu-,resonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At res 9h 2s o6in(uokx-uqvgc/l 5zm 0a-z5yonance,

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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 occurs whe x3bg p rtbxnd6gfe/q0d26**qn

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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 field of 0.2osj pywvo-dzf9e15b7t j7f8a4qkv , ix9j2s-0 T. Find the magnetic flux through the loop when the plane of the loop and the magj fw89k1-x v2obs-y9qai v7p doesjtz f7 j,45netic 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 2tg4+bwgcgo2kt)- m vm is rotating in a uniform magnetic field of 0.20 T. Find th2-g)vckm2 wgt +tg4obe magnetic 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 0.10 m is rotatin- dkwry ke 131gh6txe;v8x:qqg 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 field vector are at a-; rehxkk6tq8 v:31xyg1wqedn angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop .7dg asf ip(po 4wu/j4is 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 chzz5b :5w -vdhm6lt7t kanges 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 sexvqg (7hxntg-j(2 .rquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.507v2e(qjxg-x nh g.( rt 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 +szhexx- e- t n0v*o.d15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area l q8s-i 3p7q+me s*cbo$0.20 \; m^{2}$ 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 fliesk; v-c*;g2a sphw 1xui2xbo:tmdm;2 h horizontally at a location where the downward component of the Earth's magv:2;s;btm h*; xcm wxkhug 1-dap2o 2inetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long r/4 )pp8vl moofy+deq( otates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fie ym q ev8loppd)/o4+(fld 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 of2ukj p0 auqv7uo0t,o) $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirefe.;hitu41mlj lhr6: 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 loop axv4kto+vw : w/pogq6xc1:6x s on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates a oo66c 1wwx/4aqkgx+vp:vt: xt 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 wire of area -xv06oesi mf1$0.090 \; m^{2}$ 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 qsm4689ub7ek sh81d q)r7a5 xfiq cyugenerator with an output of 12 V maximum when rotated at 6 q1imcq9567 ky d7ar8eb sf8h) sux4qu0 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 max89;ae mx y/jwa5ngdv- imum $emf$ 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. The motor operates on yztxo27 di:r6 $120 \; V$ 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. The motor operxy378j+rsv t lates on 120xt v+ysr8 7lj3 V 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 resisoxo u1 b8j7 aibqsy(m4ht0f,. tance 6.0 W is connected to a 24-V power supply. The opeoub,bo (7 j1qit amsh48f0yx .rating current 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 supplymnw1jooja c sk*(ha j1wq0b.3-*w nr,. The operating curbn(jnwow kj1j,.w0 hcs r*13ao-a *qmrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanc iu*g17+l3+tchr zy c,yb 7uuoe 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fuco,+y 3i u7+ulyr uh*7c1tgzbll 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 to reduce a primary voltag2 wb+xt dam7/ze 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 causet1 ut3y:u zh s/ wk8g5l4.o x7ljzde2ds 14 A to flow in the secondary. How many k7gs5tu 4 ezutl:xj dy.3o8ldhzw 2/1turns 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 neidz-su)v* ze js )nr-4cessary in a 110-V primary if the 24-V secondj*4v-ni zu s sd)-zr)eary 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 s)t 4lom/byib+fmk14 0 cz:gyf econdary coil. If the curmktf4b yc by04 f+)z:gi1lm/orent in 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 primary of a transformer. Assumi q5 *eaf )5:lz+7aa fdmfh)wfang 100% efficiency, how many amps at 24 V can flow in thel5zff*m5w:afh aa7 )da+ e)fq secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transf4 qy+ll ehf0qpmzk2 g4; uk9gur f(7;sormer provides 7500 V at 10.0 mA. The pri(l9lp ; 4h 7usuz gk;r myqg+24kff0eqmary 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 turns on its primn,w9vqhx*2* jg 2p gfiary coil and 300 turns on its secondary coil. If 120 V at 2.0 A isnp *g2qi, 9*jfv2whgx applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its p6gva,q4t nef , : eb5x0fhs*cyrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied toc, *50ght fb ny 4fee,6vasx:q the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If :9a6vgos.3mr6jn jnqthe input current at the primary is 10ngas6q nvo: .3rm9j j60 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has5m 5kh0y ejuy6vu*pyxg)w wj 75; mu- w3j0oau 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpjuu j07y)whx wwm0am3vyo*y u-k6 ejupg;555 ut voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20kna x:7 tsh8iqydd)010 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglect:x1 thyqd k7)ni08dsa ing 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 ot -b3cw7;eli 5gg/wu+ s/djgkf current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through ak; g+wgu /tgs/i bj5d w-73lce 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 6i(jb9y:u+dp bap ++ jhh9n,yj-ip) gt0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lig+py,t 9i)bu9j+yhp - (:jhjp+ dainbne of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually mo*5 g0:p wx7qnz+ xslstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost inx +:qz5px *sl7nwgom0 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 ha)w- u4;ucyh v a*kv9qp)/ 5xwi og)uxns a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduu)hyx/w woicv 9)gux5qkuv 4p- )n*;ace 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?

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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 zzt wh+8 m4y3. g+kft6nvpy;wp3d 3vl km long 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original en;dvw+3phtp3 v3fg .znlzm4yk y+t6 w 8ergy 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 mu km/q(7z4*.nsdd g0-k nea(kt( iuejkch less power would be losi k(q7 anzt/4 n kkudmsd gjee(k(-0*.t if the power 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. kb4n h/d/yaq/ It is to be transmitted on a line with resistance of 0.60 W. To what voltage muhnq/ kbyd4//a st the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a curre n:*jmt,ivkl0 nt of 5.0 A. How much energy is stored in the coil's magnetic field *k0vi: m,tljn?

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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 inductor. Whatbmjm(pq,h9 ,80hma( ,kr bhto is this circuit's time con09 k, hqmhphb b((mo8,m at,jrstant?

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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 whe/n)wy/hmk*ec1 fgrgldd4l7 5re 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 outlea( un)smz. ,sft. 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-V AC ; xaxhcmf0tiam6,q;g:-rqx(s un) ,r outlet. What is the resistance of the lamp?-x )iq,;( 6:htqrfr;gxam s0n,mxa cu

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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 th df:zyc4++j wi( ,oqypwq +n(d ( u8(wiym+xxo a 120-V ac power supply. What is the peak current through thz up fyy(mw(ixxqojih+(wdn4y+ 8q wc+ +:d, (e 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 is the powerma6d is :ho d0f/1dry/ dissipated in the re d y06dihf mo:/srda/1sistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ago4z; fs;h/de qnzv4. 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 ath6m p2t myw7 z.q5g-g 50-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 ceukg.cl8ff3 61nvr: a 50-W resistor 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-mH inductor at 60s 20f31afy3qez4kjtjy d( xh , 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 pj0h 5 e.gxtmaoy/1.ha 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanceq 5g7xow3hj 0f?

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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 reactance a+ v(z* 6,k h xi.pfm)z1aslxyr4 wriv-t 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 frequencxg)v.w /wqdaql,; v. incg46jy of 20 kHz isgg4c ;)l/qx,.vjd qi 6nvaw.w applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.5+lj/3h5fjdeg( r iuy50-mH coil 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 reactance of a 4.7-mF capacitor at v 63e+ja3vai7 b; qhj- huvdz510 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 * o3f-v;xa6 ,)brrd-ywafwh vW of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance wj *js:ve j e0i9w9w3bof 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 reactanhtcc 2i( ao.y;yvw+k 7sa7 e5oce of a 0.010-mF capacitor be 100 W?o.w(atyac e okyc75;+h72iv s

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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 0.0lw))tbd+ q cbax:,. oji0 i(mc010-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 circuit with c;kj)ky iufs4)5t fw2fua7 g96er .ka 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive . i r);tuwfk caj5 )2ayguske7fkf94 6reactance?

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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) oed(i, wqi;k-mH coil, and 1.0-mF capacitor are connected in sereko d;,wq()i iies?

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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, 2w9 +t4vt. npkj7fuv5c0-mH coil, and 1.0-mF capacitor are9wj7n5ut v vc.4ktp+ f 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 resistorrvu cpv ( 2(rpm+8prf8 is connected in series with a 20-mH inductor, what is the impedance ac+88ufvpm(v(p 2r rp rt 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 a 20-mH inducto 6yw0fuqko p0:r *u9cor, what is the phasfuo0kw*oc9 pu:rq 6 y0e angle 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 circuitwgn2e5 vuf4y, d2*d.n 2gg4nl,t um ny with a 20-mH coil and 1.0-mF capacitor for a totauf l2nwy4ngen*4ynmv,du5.g2, d2 tg l 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 needed in series w y/p50je dr(n eh:1kylith a 100-W resistor and 15-mH coil to g0ly(p/5 j1n hde r:kyeet 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 ac8fy-vwhy s79 j7p/t d 450-mH inductor at 5000 Hz for a total cypw7yfjv/h97- d ts8impedance 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 a.nf:uw8o*jvtln dgi3 wu i/) )t 1.0-MHz for a total *v .t/n dnuf:wuwgli)83 oji)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 capacp8,ilio; ts5d itor. What is the impedance at 1000 Hz8il5si dp ;t,o?

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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 9: n3wdv; q vaedng3e4p yo,r2kHz for a total impedance of 45 W?3n3r,2p;q wg94n: v eeovdday

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacqzd ayx5+ yox7sly2)z5 1*pibitor at 1.0 kHz for a phas5ay5 zxy2q)ixb1y7oz* dp ls+e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-3wek9y uh8mu4 W resistor at 1.0 kHz for a total impedance of 45 W? u4kw y3me9uh8

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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 capacitov.i9)/ch 3p j cejcy3br at 120 Hz. What is the phase anglej pi)ybc3vh.c/ 93 jce?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a5/rhyn5 l6 pvr7 i4yb/xq 6mhbk4 ;dsb 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ;bpbb 4kdhryq 7nr6v/i4y/55xh6msl 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 rwf+9gv 4fix 7gesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cug+g74ffxwv 9irrent 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 rea: l6 a7kdc /5azrs9rxnctance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current fz/5lkrr dc x97 a6:asnlows 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 containing a 50-W resistor .b0(5 bkyeq./pdwod r0h7 dzqj7r 1rv, a 10-mF capacitor, and a 0.45-Hq 1d5ey/hk b.d0qwp r7rrvb0zod 7.(j inductor, 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 serie2/vzxm ,5 uqkis with a 500-W resistor for a phase angle ofq5zkvix2m ,u / $40^{\circ}$ 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 2+a zcqxh+m;tW, L = 200-mH, C = 10.0 mF. At what frequency should the circuit b+aq2 ;hm+c xtze 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 outps)z;a que;uyk5,/ 4dklvbq/ w ut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivq5dlk)z,/;sqyuw; a u4 /kvbee reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit 2e,zle9lt f)vis $63^{\circ}$. 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 30 W. sk99 jkbsfqtq;i 2 h)+What is the power fabsfqk ;tj9 hq2i+)s9kctor?

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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 se*ngp/pu0 edum 4ro;08qwmf7 y ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppluy/;dmr8g70w q m0*4 p peuonfy?

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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-mHh jur0t*al.5 z coil in series?tzar*h 0. 5ulj

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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 seriew-lg;am f .lug)qng8g xaz;*. s with a 4.7-mF capacitor for a resonant frequency of 10 k ul.*m);8lnf. -gggq gwax;azHz?

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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 l6 ,8bx 8zmxoainductor for a resonant frequency of 1ao,m8xb lx 6z8000 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 res *zc opt+5/m xxr;k.mdistor and a 40-mH coi.mcxkz5 x;d+om rt*/p l if the resonant frequency of the circuit is to be 1000 Hz?

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