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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 4pvyh/ /.r04dp:rctfc de a0pexcept

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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 s:7s x g gbj(fwb;f(y)htates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change o*3p) vm/uw2,a1j kzt flpdfv ot6q0i6 n the induc/w,mq tiut vaz6d 3p61*kjpof)fv l02ed $emf$, 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 or 2noau53a2qgo+ v/zwf the magnetic field through a loop of wire produces what kind of change on the induc/ oua2vrqa35 n+ zwg2oed $emf$, 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 .c1j v*-+k lbo dle r26nfou.gwhat kind of change on the inducednlkgvo+ -ocud efl2 1..jr*6 b $emf$, 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 fr4gpstv;4e, lnk(0kq som a magnetic 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 df1oxem4e5io 8 irection of an induced current in a conductor will be that which tends to produce which of the following efo8i 54x em1eoffects?

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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. Ae )ytqw:+sgon)s q5m , bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fro)s gmqy tqws5) en+,:om above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magn2 tp btr4j;.eml-:z w2ff-q rret is held above its center with its north pole f.rpm-tr:et2b z4jr2- qfl;w pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector /bqk1c1o1ckr.l c;30a p sbfvpoints straight up. The magnetic field vanishes suddenly. When viewed from abover. ovcbqc0ck1fp; /kab1l13 s, 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 ton;dd7a o fs2t;p in a region where the magnetic field vector poi 2tao;d fn;7sdnts 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?

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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 gmp* .v75boqjss3;he : jl7rda horizontal table top in a region where the magnetic field points straight down. The magnetic *d:oej7 b.m 3;lgs5qj h7vsprfield disappears 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 horizontal table andh 4fgr 9e,z1olce,obzd*ax(3 carries an ever-increasing current northward. Theo,ldz 1 xa4* 9rocfbe(g, z3wo coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering /ds r/ hjedexl0x3t/ (first. As the north pole enters the wire, the in/e /3s(jx/dr0lxd et hduced 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 rj-wd:t w *ylu2otated at constant angular speed about an axis whose *w- ywdt2ujl :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 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 i s7fks:qu 1lp7s rotated at constant angular speed about an axis whose u:sksfl 7p17 qdirection 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 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..7mwu9n gf ms-
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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 th-:wjmxgp- p9koo52u zat 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. The 6 ydrlk2t2iwch qy5m; - zoe8ee( tiqg:d,(,v $emf$ 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 easp+gv7a8tp dy 2t-west direction) is moved northward at constant velocity ya7pp2d+ v8t gthrough 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/ zmx )c4b:56rt q.khz/t fk,dnuq: jy 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 transf*cteq*ecr 4 z0orms

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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 eafychbv:ny x6 mmgd0 vq++21,dch second. The frequency of t0+ y+mqbm d21nyv:v6xf cg ,hdhe $emf$ 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 devhdq 4ezpy. 6*bze)d-h2vc)h cice 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 thatxdx k8q3,*f xz

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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 -3zns wilvco2kx* oz v34fh54than the primary coil then4io3fn4hw* zs cvz53o-2lx vk 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 cont:cbdua2 yhb4l x xy(90e wm68uains more loops than the secondary coil then it is c0dxyl bu w4u826ymha9(x e:ba

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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 inpu na3ohx/x-gh ;t

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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 cirw; xkxn*1 6ly 3rdri5icuit,

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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 co odk1p0 tf8tx0nstant terminal voltp1d08fotx k t0age. 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 battery of con 3fz6,:vmc6 fwdiz*lkstant terminal voltage. At the moment contact is made with the battery, the voltage ac: 6fdzilzm,vf3k *w6c ross 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 pxm5 /dig *9hwe4wa1rand resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tojdt yeo 7b+d2 +ob0fd7 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 timeoee;q;a2fp4a f+tm0xc jn..n constant for the circuit represents the time required for the4p acn0tm j;ffq.e+;. e2oxna 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 batt ,qgak 0:-fpnrery. The battery is suddenly removed from the circuit. The time constant forqrapk-,g0 fn : 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 sam8 bueru)0/3 6jl zlildc;d(ome units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. n.j ng7gd 2wc;u z 4rnmw3gst.59xme8On 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 supplyvn:viose ( . sbjt9.t3. In this circuit, the currento.st.9 ts:e3n vi(vjb

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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 factou3,ldpb 1glg(zue0bg1qwt zy8(u -,e r when the frequencyluw u,bzq-8 gu1te bp3(1y (l ge0gdz, is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC volt(xs4 m dd .e7e1w2yztd(jxw;bage across an inductor is doubled, the inductive reactance of that inducto e4ddz2;wbx(s (1ey. xtw dm7jr

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the in5 lasg .haisd;5e y)l,ductive)ydl .gsiesaha55 ;,l 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 powj9 d /g*gac63hmp;i mter supply. In this circuit, the currenthcgp3;a9 *t /igmdm6j

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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 circuc7qc):uk48ytm.iq um it changes by what factor when the frequency i .q mu:7)t qimk8cu4cys 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 voltajqwv 9sg53aw7)r77bswm zc a/ge across a capacitor approaches zero, the capacitive reactance of that capg s7zaw j9w mv)c7 sqw7rb/a35acitor

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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 capacit6naq*rdq j ;e:fxq8y-or in a RLC series circuif :-8qn;ryd*qx aq6j et?

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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 icnuvv,h.fz g80-i,1vcmk;hp :scl e :s defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incr/sinp ,d.k6i1/8snltl )yl7fx m9 t pzeases if R increases. Wl,pxslt n.zs i87tfpn6lyd )km/ 9i1/hen 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 +) hj orjr+g/uif $X_L$ 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 c*sj8tg9k8+wjg fpfyr *vva- 2 ircuit. The impedance 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 capuuj3mj7)5l scnr ifa-5 vd/ ,dacitance both double in an LRC series circuit, the resonant frequency of tha, n/7)mu3 i- svjjcal fdr55dut 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 circ 1f,*ypsriy q6n6z 1jvuit 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 RLC circuit oc1zq i 3rx2xfp+u*jwqs mvj6*-curs 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 magnet 4la6w (bgem+hic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec6 awlem4(hbg+tor 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 uniformw j +44u)ub)geaavbfjpv932x j1v :ac magnetic field of 0.20 T. Find the magnetic flux through the l2 4jbgbuj9 fvw)3vu+e 4)xcjaa:v 1p aoop 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 rotating in a uniform magnetic field of dz0 mgtbsmn rd8x/k:2*bxz yjl4. 6w, 0.20 T. Find the magnetic flux through the loop when the plane of the loop an2dymkg bm46d0:zn x8.t ,brxlwz/ j *sd 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 py;i5u e 9sx.y,sce)mb f:) qoadjustable 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 changes frbb4-q (pkgoi1rog(g 1om $4.0 \times 10^{-5} \; Wb$ 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(kela5 /zaa 7k4q)irf frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the z7alaqri/) ekk(4a f5 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 15a0/) ntphv5hzs03 jbs 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 frn nm5 fkdj1*hz)(o b)ks (. 14scfkgarea $0.20 \; m^{2}$ 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 horizontallybj 9 d3g: l2z5zktl6rg at a location where the downward component of the Earth's magnetic field :6 52z gbrj3dlgzklt 9is $6.0 \times 10^{-5} \; T$. 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 an+nt-kw)dd3v/-ea :zbr2rmvi nt- h 2sgular velocity of 2.0 rat rb 2-nhaz/- t3v)m kde+: dis-rwnv2d/s about a vertical 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 anx82ccbw40bohrm 8mtftg/1 ;h d a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire od5q1/jm/ldhq4x0:d fsiq s;x f 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 armatureex: us4x9j8up +6jqon. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic qpo uesxjn+u6 4x89j: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 dsn+,byxz93 ow:be l-100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of-r4-lj0yo rv;me5l.uh(dkc t 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I-lju v 5r( mol.h-e4;y0trck df 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 g, 4zk mk1u2jy$emf$ 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 ha1a k;9tm;*j//n z-uiihbx upkve a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor pjxq/+r( (pkyp om3i1 sqbcec7px5 7-have a resistance of 6.00 W. The motor operates on 120 V AC, and when runn3 p m+ k-71oppq((exs5cpxirb y/j7cqing 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 qbyw*c h-*i1h4k5dk9h ((l t2dcwung6.0 W is connected to a 24-V power supply. The operating current is 1.0 quhwwy-49(l*idt 12 k dhc*k(bhgn c5A. 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 Wt-.(qdcd.1pblbt zpx,uuaoj5.k45: h wj ,jd is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha-, t.uc ojdhbdu5. bj5(dq 4ka ,1z:lpxtjp.wt 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 istmioz)3 2rt4ffp g5 d2 connected to a 24-V power supply. The operating current is 1.0 A at full fmir 2dp54gozf)32tt 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 nu2okfe9 +xn (is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer caus c4 3jekla6ts8w.l6y x.tua .ges 14 A to flow in the secondary. How . jlctw6el.ya xu k4ag3s8t6 .many 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 prima5vkqwg.oxh2 .b26q yi jd6el9(4adad ry if the 24-V secondary has 100 tudjo(qex6ld 2 6i.w aq2dyg5h 9. bavk4rns?

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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 5, +u;qziso*)m)v wile 00-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A +*zu, qime vw);lios), 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. Assuming 100% efficie5b2f3hkc lw (ubcrb:,+e k t+incy, how many amps atc, u5t3 kbrbb+lc+we ( ihkf:2 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7532h ph cm0c :kmqu5+ai00 V at 10.0 mA. The p5+2m iac c0mquph:h3 krimary 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 primary coil and 300 turns onjp8bt6lvdl: 1mu 48ej its secondary coil. If 120 V at 2.0 A is applied to the primary, what volta68bvedmlp: 4 8jtluj1ge 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 primary coil gpcrr62un m -.and 300 turns on its secondary coil. If 120 V at 2.0 A .2rrgnm-6u cpis applied to 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. Ie 3s m(qywk s7b1q:)zsf the input current at the primary is 100 A, w3 yk )7esq(w:s1zqbmse can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and i(iywedc 7i1 p,ts secondary has 200 turns. If the input voltage to the primary isyiie,pc1w d(7 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfor(+proc 0/2qn.ky gcojmer has 100 turns and its secondary has 200 turns. If the power input to t2nc .coq0rpjy og+(k /he primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually syy *d e9qd /fp74xja r.,sfpj sp:3jf-tepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary j-j/4fxf:,ry qp9*.pds def 7 jya3sphas 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 is usually s (6 w0l/kyihuxtepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost ih(kx y0 /lu6win 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 dsalcl bw1t+. 9j,y/xis 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 i9 wta b l+,/xcld.jys1f the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total te5hyehp;42o6l ubt* 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, thp uh*bly2e6et;o5th 4 e voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. hxb-j pl-*c )i A generalhb) - jxic*p-tor 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 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 9/q4u ow8j2rwo ludy5much less power would be lw82wu l9q4ro d5/ jouyost 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 .imkht +7vk-b. It is to be transmitted on a line with resistance of 0.60 W. To what votb7m+k iv-.h kltage must 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 current of 5.0 A. Hq;s3,/xcnre2 c 3(d-vd8a3 y iniqmslow much energy is stored in the coil'sm(d3 a 32qd3cvn;/,eln cixr siqs8-y magnetic 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 dv b9u3 .+skxl5n g nd(,mkhxr/0/vsa6.0-W resistor and an 18-H inductor. What is this circuxr/vk.,an( x k9 lsmn0 usd3+hg /v5bdit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC c6(s:i/ qw;j yv.a wrduircuit 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 ACxv) iak7q -jt:t/j3.xbvg v1x outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the rep -oqesf5- vc8sistance of the la -pc5qs8 -vfoemp?

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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 pov.vnu(m/yjoiz d -;m* wer supply. What is the peak current througn vy;*omzm.d-(ui/v jh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is cosxc,-mvh5st,7 *m hmgvr 8: . )dzrwyunnected to a 120-V ac power supply. What is the power dissipated in the rs-c*7mmsdtm:yhg rhw zr)v .u ,v,5x8 esistor?

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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 resistor is q9i, d39gtln ppos70d*efe-v$I = 0.80 \sin (240 t)$. 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 0 (5 zow/f,ojjm,j-nrbmtje 2 $I = 0.80 \sin (240 t)$. 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 is up ix 3e3*ad)+k ug25 mfp)tp:5pgdz z$I = 0.80 \sin (240 t)$. 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 reactanceos+xqcj+ lyag* 7.fg3 of a 1.0-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 rea4w sc ci+ijpgnz6kw/5 73n.znctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil hgh1(f hzzd 6c5ave 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 inductiv cj*hm ah*8:a5wiz/kd e 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 1h 9po5p0 (g(bnsel* jn20 V AC at a frequency of 20 kHz is applied tojspelpo n9 *g5b( 0hn( 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 1.o(;eipp.s(d,ixf;hzl do 4stm9 cp 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 reacjpm-6hkh*go6zxd x;d( as5( ctance 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 reacta.gj-or uhqs:k2n6 2kju,e gh,nce 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 haxk3f c01zv e/oj6 l6 a .t8ex3qhez/ysve 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 react2 cusi0ee d+ljz7uvi ;-8l/ hoance of a 0.010-mF capacitor be 100 W?zh i-2s 8ou0/e7iu+;cellj vd

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor au 2y*:p bjt*-9e4 vcgiulutf,sds9 3et 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0orfaznikw;jh./b6f 32; pi a / j0fe:z W inductive reactance, and 10.0 W capacitive reactana0f/o6zzkr iwf ;bfjej.ha:;32pn/ice?

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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, 0uy:a nfjjsn/+kqx t84o/ 1ta 20-mH coil, and 1.0-mF capacitor are connected in serink + jn/y/ftx4t:u a8saj0q1oes?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, andmb2z( h x: a07*xjviuh 1.0-mF capacitor areiz7( : hjbxa0 vux2*hm connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seriwr tn42qih+:-j. rpnoes with a 20-mH inductor, what is the impedance at 1000 Hzpiwt:+nnj. r2q- h r4o?

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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 seriesl r c( m6(6e;xvin*oj -,nkhte with a 20-mH inductor, what is the phase anglevlj 66;ne*(me khx- o nc(tr,i at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-m yw6bh1 thod h0u3:+jz 2qxpx*H coil and 1.0-mF capacitor for a total impedance ofw+x10 t jxh3zyd :*h p26obhqu 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 with a 100-W resist5q )4kcq /ppaoor and 15-mH coil to get a total ip) qoa4p /kqc5mpedance 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 dtf8, e(kefn oxdk*2:inductor at 5000 Hz for a total impedancefdfx,dte2 (k:ne *ok8 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 resi zuhm/-oo/b g*stor at 1.0-MHz for a total impedanco g/*zo/hmu- be 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-mFtaxh )u6irj 6 40 moy9 ihdxb;:5zhsw0 capacitor. What is the impedanceh6i m) di:hu 0649hsx;yb art0xj5ozw 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 1.0loab;m ac4x7+iu 51d9evuklm668 9zu *yq dib kHz for a total impedance codkqdvm*xlie4;buy6l6 u b9u78za i 519m+ aof 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor atu/ zx70c8kqsh 1.0 kHz for a phase angle of u kh7x80cs/z q$40^{\circ}$?

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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 resisy e2 ymm.owk43tor at 1.0 kHz for a total i ymo24e.m3k wympedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series wnma (y1dkh2hqb 64 ,viith a 100-mF capacitor at 120 Hz. What is the phase ang b4qdk,(hi2ay h 6nv1mle?

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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 e :)f.gal)jok if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in se.) olfa e:gkj)ries?

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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 cd nud j;dnnhcw/:n9a,p d5 -h;apacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What -w:chau 5ndnn hn;d9j,;dd p /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 capacii*eioom:h/bcvc+0j6dbk b72 tive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V,c/i *:o672vdbem+j0ikho bcb 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 cont- 4 lq/ juz (e-agn1,ywy+nc;j1aedwc aining a 50-W resistor, a 10-mF capacitor,qz;l4- gdwj-1yew y c,e(juncn/aa1 + and a 0.45-H 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 series w-s -bfdo6x7v yith a 500-W resistor for a phase angle ov6-7o-fd yxb sf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C =po+zy8x 8skub6wv*.j 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving so8 u+.v*wzxj p 8kby6source?

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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 inv+wcrl4ozan 7u4 --m uktt;(n an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when 4ucoklt-7 tna4vu;(m w rn+-zthe 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 ism cgc-hrog 4l.uj7/s+ $63^{\circ}$. 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 3k lcvyl,*xg460 W and a resistance of 30 W. What is the power factl xy*cl3gv4, kor?

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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, aljjs udxll4 -6vu cpd),sj 17+ 10-mF capacitor, and a 0.45-H inductor, when connected to a 60l v xj,u+d61u d74-jsclpsl)j-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 j*xr13 vw; nwg1.0-mF capacitor and a 15-mH coil in series?wvw;*nr1gjx 3

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series widjh. n0s6hx, c8qz/t bth a 4.7-mF capacitor for a resonant frequency ofc,hzhs.86bxnq/ tj0d 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 3.7jebii/x1:m /i -mH inductor for a resonant frequenc ij :e//xbmi1iy of 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 must be placed in seri:p k:l8jyo:p kes with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit iol:8y j:p :kkps to be 1000 Hz?

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