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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux e5k qej -l8btq(xcept

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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 states that vd5;bgdi)t-06 mzpyhthe $emf$ 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 kaiym m0:/3 irrind of change on the indui:3a i/my rrm0ced $emf$, 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 strengtm+nga. 0 kmv)0w,ucf*z 7worch of the magnetic field through a loop of wire produces what kind of cfwou0,rcmmc+ azk0)*7 n.gw v hange 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 kfp4 wj,ta m4)what kind of change on the induced 4j kta)4 ,pwmf$emf$, 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 fmq sk)54brwl-rom 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 direction of an inducel +e)o67sf k p1gax3icx-p1ma d current in a conductor will be that which tends to produ1i+ppg) cs-e 1 alf6xo3mxak7ce 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 table. A bar magnetu5k):j h :gyocwz/b p : *mo7durg0+/.dy byql is held above its c 0gry z7+bdgcyoo pldqyh/:wm)* 5u::/ubj.kenter with its north pole 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. A bar magnet is held above i2k yjj -3k i9w(9nswfets center with its north pole pointing down, 9 3w-sw jij2yn(fkek9and 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 magneticwjpmomgl4.b r* h 8tr6w */)ue field vector points straight up. The magne mt l*b uh/ojrww8 .4*r)gpe6mtic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where ,f ,*b vmnfix:yh:ny4the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil v ,fyx:n4 :ybfn,mih* 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 tab. br2wtim n2oon 6ed/hdb */5ile top in a region where the magnetic field points straight down. The magnetic field disd.6e52nwd/r*m it obbhnoi2/ appears 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 horiz0w sjnc:havg* w,.k1s3s 0owq ontal table and carries an ever-increasing 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 v,o hkwssg*a3 q.c1ws00:jw ncircles

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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 thr(*fx- m2vf-m v qcxep+ough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be xq+- fe -m2*p(mcxfvv (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 dy/1d(5 fqdrr is rotated at constant angular speed about an axis whose direction can be varied. In ay rqd/(f1r5d d region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at coz)+ks8(vuy: 40n 6yb1 jwnnl jap ov;znstant 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 axiszpsyvonwnj1( u +6 z4)8;j0na bkyl:v 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.lbjl r29 0fox/
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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 thaygq9n5tihf *amg5k2mc3a*5it 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 fieldpcop wp-mr b+76i47zpjtktjv/;n ( , e. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward attp5bv99yz 3j s yy/h1e constant velocity through a magnetic field that points st 3b 1p5 9etvsh/yz9yyjraight 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 barxekk,bt*x :kc)4 lmtqu q5v h)oun+ bu5 4:x+o rotates at 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 transfk8miox7,qdy4 sb 9j4xwr q*u 7orms

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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 second. The frequency,2a,xv5c wvt (fkjv8c of tht v w(,ax 5j,v82vfckce $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device :g,9wkfg kou x9b1n* hused 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 thaol 96epxe78r9d+ bbi 7e zb;dct

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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 tha0dw0v*2 o l5n. ;ius(dsxg0o)eln ugyn the primary coil then i len5 ug s); 0*0i0lvg.( oyuddwo2nsxt 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 mo*ipbz,;ju.k 8dztxha7v9 j 7j re loops than the secondary coil then ia*jhjijp kv79t;d zxbz7 .8,ut 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, thesdlc-a f4(l qu b8c,f3by42oo 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 ci(u (mrr2fjr9 c 6 zjbxp.bhq/;rcuit,

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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 connectjqwj ihh9- hfa 99i35fonn7j gm+ p/(ked in series to an ideal battery of constant terminal voltage. At the moment contact is jhjahg9+o7f 9n-( 3 fkiq/ 9ijw nmhp5made 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 seri37wb6bt*e mi ies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor meibbi3w76 t *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 resistan99ia8gzr3pj me9p;cj) 7fbd q ce 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 ickcoz2 4m :2 g(a)qthms connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to 1chp(d 0e6xirthuh.4p/ uu ;vaefs.3 a battery. The time constant for the circuit represents the time required for the cu v1; puu 3heh./uphas.0d t fr(ei4c6xrrent 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 areyc-i- 5k d6ozr connected in series to a battery. The battery is suddenly removed from the circuit. The time constanrdizk6y -5oc-t for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unv1,w2x+ e0 4)nqnkab/e iyoxl27z mxnits 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 ans6nn4p-(j+i4 ,2w3 gmsw fxp v:em ryy 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 ncb (n86 evfq xp*6oj:to an AC power supply. In this circuit, the curren(jc*6vf6 x o eqn:8bnpt

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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 changem::g,mcuwh(/he . beys by what factor when the frequency is tremeghmb(::.,huy cw /ipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, th3iwcbef c :j5 .p:yvd4e inductive reacj5 :f4p .ev wycd:cbi3tance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage a/gst8bgb/6..m sy g4v m,fh7qfm (okh cross an inductor approaches zero, the inductive reactance oh8 fm6/sby/gk,gt ( vo.m. f7 qhgsbm4f 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 ACcize dqk;5gi3vt:jv.p/ w p* 0 power supply. In this circuit, the curren qp*z :igwj/.pcd0vvik5t;3 et

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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 whxaz-.kwvh 9x; f lt*-ken the frequency is -l hfvkz9-.wakx x ;*ttripled?

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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 capacitos31:ztkevg e w9lc;cj):z ,qs r approaches zero, the capacitive reactance of that cc ce)z;3jks :ewzg ,1:l 9stqvapacitor

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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 t09 z5gix1x pmcapacitor in a RLC serie1px0z 95gximts 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 ant7a;poewsgb01o -/ lr1 n/iha RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuitl5 js *-6xyi rgcni* oq)g8,fn. The impedance of the circuit increases if R increases. When is this sns oqx*yg ncrl*85 i,6gf)ji -tatement 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 increas a.ef*pg,wg2nes 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 bl-c ptn rf*nibh+3- r1/;cuop: g3oa4g pys4the 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 *4 y6qjfmcal-the capacitance both double in an LRC series circuit, the resonant frequency of that calym- qj6fc* 4ircuit 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 appxtufit45wh7 7lied 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 xys+nsph8x (l1; ( x8* f1dgagd ev( gr6dyw.rRLC 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 fiy;y(q gc5 72)jtexp soeld of 0.20 T. Fin js;xo) 5y7ecpqtyg (2d the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiu;sp7ol x5:diwj : r7fws 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are 7fl iop; s7 wrd::jxw5perpendicular.

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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 h +hpqw q ;evzcl:ou6(tt0 mok4ml9):uniform magnetic field of 0.20 T. Find the mazc+(qok ml l6q4 t:9vtpe :hw) 0h;omugnetic flux 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 adjustable single t8,v.)u gi* q(k)exxa* vfs*p hyn /uiloop 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 chaxll/ 3w2.h)gtu bzh0b1;h btf nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square fdbddx.g)/u gq ;jya;nh20t.+ fcxn-qrame with sides 18 cm. A uniform magnetic field is applied perpendicuuj.q;tg hndy2 -x/ 0anbf.;+ x cdqgd)lar to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and 1 qz x;uk*d2dkan 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 mgn jinh0u.3 (7s;she$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at)k8* yz,ljz su..jxgb a location where the downward component of the Els* u.x ,)k.bgzjz 8yjarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates 4 so(ep)rwi v 2d*a4wuat a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field*pe4)u ai4 w(d sov2wr 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- . zprwb +64rljunnfqw:2d ksl4) :ao3sectional 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 oe:t 1,u0: h7k;fcc jvqfyo os gmu(s71f 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 rectan8w;6q*qxew5lg u5h stgular loops on its armature. 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 6h*5eqwqxl 5u t;ws 8gloop 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 tod7sm69 teu8aqc9 i h:urns 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 12 V 1x6st, n9u3iusfb)oe maximum when rotated at 60 Hz. A magnetic3,s bn1)tous9xeiu f 6 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 wvm0+sdu (z7chcu-+ r7at oeb9ith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have ++ w po7e+bxgna 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 mot2t .z1tpln1jre xp9:bpjfl* +or have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it tpjlz+exf t1n92lpj .rbp: *1generates 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)*sup :t4lpcz 6.0 W is connected to a 24-V power supply. The operating current is 1.tup:p 4zls) *c0 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 a d qb bw-jc,q;4hx8yb6tf(-oconnected to a 24-V power supply. The operating current is 1.0 A at full speed. Whaqw ;fxbd, c(yt 46aqho -8jb-bt 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 wi 13-ddznj.wto a 24-V power supply. The opera nidw 3dzj-1w.ting 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 ift; gk)b/1ygqs 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 causes 14 A to flow in the s;ixohaqq0+6w(vh27) m i txubecondary. How many turnsotxqu x+60bh) ;ia (7mw2hivq 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 necez fewswm gd8 foe-*xn3o012,c ssary in a 110-V primary if the 24-V secondary has 13 e2 e1m ,0ngz- *ws8dwofxofc00 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 am7e 1/- vvbkox,nrq6a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primavxeo1v 6a qr/,mk- 7nbry?

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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. Assumint+qx8 14 ;o5hejfhjyoel)*ed g 100% efficiency, how many amps at1j+45hq*;8 ojede)eohl ytx f 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 transf io hhqmg/kn:161 6uyhormer provides 7500 V at 10.0 mA. The primary coil operates on 120g 6m:y1 q1/hhuonih6k 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 an o p*znsuj,.+fd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whafnuz .* oj,ps+t 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 primary coil and 300 turns onjby2sm q0le*22gavz 9la ,+zl its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present e,g2 qb zs * a9+ymav2jl20llzin 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 a7ptv01 :dlf g( e8fgy*gmzf +ui;+vb cnd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpuygt*mf7v++0g;f 8 zb1:gcdli ( peuf vt 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 2zang-wmv7ky: fr 9 k-its secondary has 200 turns. If the input voltage to the pryak k v-9:znf gmw7-2rimary is 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 transfopji0r 2t d 9kiw/3lwz3rmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fric/39 dlj3 kipir0w wzt2tional 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 of62xvo -n7r kgx current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line o2xxn vo-grk6 7f total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. . h9g uh4rhds5The voltage is usually stepped up to 4500 V by a transs4h9 5ghu dh.rformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The(*gp r9lea jl6 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the volp lra6le g9j*(tage 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 rowl 2 d/x54awlesistance 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 or52/oxlw ald4wiginal 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 tot: w9tcis(ax;tal resistance of 0.60 W. A generator prtxc; w i(t9:saoduces 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-Wu8ye sr ,t9 tiu8tdao7: +kd)e line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V +ttsoi )e r8u87dy dut:9kea, instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmin inoy3p5+us m3i : y(w-y/unztted on a line with resistance of 0.60 W. To what voltage must the wpi5un/ y:n +(myiz uyn o33s-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. How much energwhx4r9e ig*z ai/o0 a4y is stored in the coil's magne0 /xi4zh war9ig*ae o4tic 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 inductor. What is ttoic 8jlv +rf 3 cw7io+zb8v-,ksx g1;his circuit's time c7cv 8t3k oixwj+ lo +csrv-; gzbi1f,8onstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the p/:tc olz7: 3glj;oufs5 way2 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 129w/;kne p.r wc0-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whfc c wx5s p6u/9b-fr:aat is the resistance of the lampx c6p sr-bfa/5 u:9fwc?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply.fo1 vb83qblu 3 What is the peak current through tf 3ub8qob vl31he 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 powep ze*;s7lmaylgir28ynnm .f ;x( b+z8t k0wi9r supply. What is the power dissipated in the resislrmyn *leg8 b7si iwy (;.m2tzxzpa+ 9n0;f8 ktor?

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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 resoc o 7s)iqh r:3slhy-)su qq/*istor 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 b0uh g+ 1h2,hqvny:ub is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-,nu 9hb cx 2c:5f6bquxW 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 indu /r4gurbs .m: qdf wdqhmr/y( g,9w-pwjf/x.+ ctor 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 reactanc 9+c7d7s1v xxw:hazo+cjje q)e 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 5nxe ncl ,vg.06*ecrx a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necesh -(41q);6h t9wl t nu)em9gbxvofc lksary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows inw djh j;lt)yybby21- 3 qkqnr9 (1j7nr a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applij r2rq1y yw1lt7)ny-d9 hn(bkj3qbj; ed 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 coil due to a 110-V, 6 ,t:0n2pt;/hgs f ylez0.0 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 reacta,o f(8rc2f)w9hbf5 vps u (zb4n2 rl8 ogevd1nnce 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 nee3o.hmm o59km w dgkhyb*b+ d:/ded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 1a5bj /x jbhd5 c iy;2fkmmn9q2j7y,5k0-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF cal4te4840pps q 5sl keopacitor be 100 W?plsklqe8 45o4 sp4te 0

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 67h/, -vko36tid dhypnlsj,m5.0 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 9 u ksgq6q4:utn vj:-sn1uwz1series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10j:wu4vnns : - 1k9 61utugzqqs.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedaz khb-.- q*qgence at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co-gqzkqhbe*. - nnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor,ub.rc5ef,gu:z/+be/d v kd df .,nd.k 20-mH coil, and 1.0-mF capacitor are connected in serigz,.c:k5f e fu . ebn/udbv+/kdd.r,des?

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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 series with a 20-mH qs qvw.+3 ymenx8s*4 kinductor, what is the impedance at 10008e qs.q+msv4xk n3y*w 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 inkti -5( tvf 7ul 6nyi:x1x6hfo fmt7n+ series with a 20-mH inductor, what is the phase angle atoxif6vmn7hyt 1 7f ik+x : t6flut5(n- 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-mH c1 y:k+ha1e:emcr ap 3boil and 1.0-mF capacitor for a total impedance ::3hkbamcp+11eya e r 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 capgi w.eeqbm.ec3 1)uu(acitances is needed in series with a 100-W resistor and 15-mH coilw.be1u3 mg(q .cee u)i to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor*k4 9lncx tqlz h j:, n0p8ree)2(xysw at 5000 Hz for a total ix,*rz4lkesl n):9j2t0y ecq 8 nwh (xpmpedance 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-kbkt/ i.2 /4v*rgru jl;xh3x owW resistor at 1.0-MHz for a total imp rxx 2;/ /otirhlg4vuj3. bwk*edance 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 capacitor. What iswq7; cm,*y1vxcrl c b: the impedancclcm:7 *q;x1rw ,y bvce 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 inq;zgyi h(7w e- series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?e-;z gqyw( i7h

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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 3gf st4wh3j*r series with a 10-mF capacitor at 1.0 kHz for a phasw4g3t3frs h* je 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-W resistor at 1.0 kHz fo prvk bbvumj)ni)(v8 m);;/je*avjx 6;(b wz pr a total impedance ojjpzr ))mb;) (;knubj 8 bmv/evv6;* ixvw(paf 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100c8z *8 ndvcv/oy f))gv-mF capacitor at 120 Hz. What is the phafv *cco)/88yvngdzv )se 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 1bt,ye;s2nij p2 c: xe:500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaet:ys ;ine c2 pb2x:,jcitor are connected 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(0lp+ n2au4bxl/szm1/- wbe h ral hz0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connectedllhz20 rpw/lm 0-ns(xeb4hau b+z1a/ to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a sy1w d8z 5ofhoky6 4hzm1rg6c).-ifg capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuiy o-1 f6)h4r dzy5 fk 6sgoh8c1i.wmgzt?

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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 circuit7 eoa (hltukwms(2u+1 owx*-s containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, ut o(w7wks+1*o(ue h-xl am 2swhen 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 with a 500-W rej)0 hh o+)le s ddpqf:u:2p0bfsistor for a phase angle oepd:s2q0 0boh )u :)lph+fdfjf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freqk1xpd .;v 9ebtuency should the circuit be driven in order to have maximum po.;vtxdk1be9 p wer 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 with 12.0 W resistance, 15/sc8bqze y- /g.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is e yb-s// 8qgzcconnected 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 A0uw l s3h.k;iaml ,f)sC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W 5. rcxluavt j -qzs5*tz4 jg h68l49qoand a resistance of 30 W. What is the power f -shj toj*lgq4 . 5a c86tz954uzqlrxvactor?

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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 pw5f)vs79wwrf 0 y. garesistor, a 10-mF capacitor, and a as .)vprw5ffw w 7yg900.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequen k6,)nx/+i 5bwanauzecy of a 1.0-mF capacitor and a 15-mH coil in series?+ xz nb6/euiaa, k)nw5

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needg)b dqmb4pqx g6sd ) no-1,7yied in series with a 4.7-mF capacitor for a resonant frequency of 10gpd mq6qb)o-1 bd,yins gx)74 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frzq/2.+ vl zozh r6hs+dequency+dh/+ orz.6slq2z hzv 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 series with a 3fv 4ivk frnvu0wil/2 ro/ :l6n,b7ra.- -mjjz0-W resistor and a 40-mH coil if the resonant frequency of the c.0/-ln nvzj:/br - vvmru6ka4 ,r 2 iflji7fwoircuit is to be 1000 Hz?

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