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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 following3hicam2qyyds09l yxgq5 // *h are 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 states that +r4ucyh yaphv)s0v8;oshn8 1 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 changepnwpzes2+fm(s 0+fbk.j7e/ x on the indbj 2x0fwp(ns+.+ m7/ kpe ezsfuced $emf$, 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 magnze50v n2jkc+p5 1zhsqetic field through a loop of wire produces what kind of c n h5p 5zq2cske0j1z+vhange 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 wirekz384xe/ d zoe,)tby+be g7jib-gau; produces what kind of change on the induced uj e ;z-g/o+idkbb38 x b4eg ey)7zt,a$emf$, 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 mhq165y oe9 pq9-e xrdcagnetic 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 conductorsto7i9w2li;+ 5vho8ihn hj1d will be that which tends to produce o 1 lhs29oi5jw7ti; + ihdhvn8which 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 magnetw xcifmt9r6n:akx* b3a/k m8/ is held above its center with its north pole pointing down. The mbna/w3f timcx x 8kk9/a *r6: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 ba ulqc w/v v5sv8ah;./zr magnet is held above its center with its north pole pointing down, and released. As it a lq;v /v.wuc58vh sz/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 olwxmh5k3u6dub5/d)m: q:ix) udk q.in a region where the magnetic field vector points straight upo5)ud xlqb6./)5qwd:h3:k midu xkum. The magnetic 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 the magneti dt. +fu9 cukk2k9;rhvc field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what 9k; kd 2uf 9chkvru.t+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 .on jmt+uk* z)table top in a region where the magnetic field points straight down. The magnetic field disappears suddkutj ). no+mz*enly. 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 horca u0, ru *nrty3th688xjnr)bizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on e ,)b0h8 txa8c3j6n *rrn uuyrtither 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 t0z7k hvml9t/z1*s ttzhe north pole entering first. As the north pole/ sz1l*m0z tktzth 79v enters the 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 5zhq /sj/(xz y2 qm:rtat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fieldqt(m2 s5xq yzh/r :zj/ points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ang-eyucm g ;t(x.ular 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 axisyg.xt (; u-cme 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.aab3ueys d9 w;5 -q(zo
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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 that an m 6c 1q1tdzvh8$emf$ 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 magnev t.2uez /rl):q;sbaatic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the eas( vhx8hziw6 7z q2ojt cd,yck*p99g1pe/ w j-bt-west direction) is moved northward at constant velocit29 zjzh/-g pcxji9*hq,odpvw(6t 781kwcy eb y through 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 conlc-6qof lm51 astant 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 tr qgf(noamr:35 ansforms

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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 sezuu;./(o9 bzkpb yd -ocond. The frequency of thzku doz y.o ;(/9ubp-be $emf$ 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 usefe r fod6z)wd9kl u/1q(,nyjh9kf-z. d 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 devike2dbmd,9 a0co 9o)a yce 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 secondary coil contais4m2l15cf, dusm5tz c ns more loops than the primary coil then m lf t1c2mzd,5uc45ss 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 thane: 6;cd i5rihn the secondary coil then it isi ie;nhdc65:r 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 po vdc-- oquqita8la uxp9n /932wer 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 h5x.ipx w1krd: 3)ufr,)ihm+qby s+ qcircuit,

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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 batt(i v7pgu6( dndf2m m)k 2i*kmyery of constant terminal voltage. At the moment contact is made with the battery, the v7nfy d6*)gmdmui k mp2k2i((v oltage 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 indup4) l3sky+t 7r pw1fz*svf+1;tmc ggr vz;r 2uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the 1k * fu734ztgvvc)y mfr+g; 1wstsp +rzlpr;2 voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected 7pm 8u kjieyu441h;cl 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 witfbqg-lz;ust8 5yp,,p h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor a0m z:+ 6ja a2jqusipm+re connected in series to a battery. The time constant f mauia06z m+p +s:qjj2or the circuit represents the 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 indu3yk5o r;vio x:g0xg-0z)njycctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cuv0r:g3 )onx;gyk5oc 0jz-yixrrent 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 units 1n)+ 4eoikymn) 0 o6cvsjb8vqexcept:

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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 a9fh7h5 /oibi 1y:u r ck -xg;owt/pf*mn 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 power supplb .:(3*zj1 ahkqhjszp2e a q78irlh5sy. In this circuit, the current z(*12bh5jrqhz.: 3jk8q hasls ie7 ap

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance g8b.zrn3wf 09 (jzx+ix k fzm9in an ac circuit changes by what factor when the frequencr0(jwgif xz998z.x 3k zf+bmny 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 voltage across an koq yb5i 8gp-:c+ jgyhvf2.d) inductor is doubled, the inductive reactance of that inductc -q5.: gdpj hk82y+b)vigfoy or

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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 acrossoaa(u(o(jp ob 2a w;3h an inductor approaches zero, the inductive reactance of o (aju w;2(oabhaop( 3that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply d(8,w 3qhwvvo. In this circuit, the currevqh8v, 3(owdwnt

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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 changeuyqo3a ,ay;40 re;f yes by what factor when the frequency i4y;e yao0qay ,;eu3fr s 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 voltage across a capacitor ap-fz i (i gf.zu:cdta5-proaches zero, the capacitive reactance of that capaz:-.tdi5 c (iguf zf-acitor

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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 anglepakn. gz1:w ;hp9j3 om between the voltages of the inductor and capacitor in a RLC series ciro p93w hpg; k1amj.n:zcuit?

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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 /9dpj88 uchiqRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Ty:fo q6(s,dgxt-g n gdv:41ji he impedance of the circuit increases if R increases. When is vn-s f(jgt dyg6oxg,d: 4:qi1this 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 incre w0u*7 cs*9svxkxy)syg: +xggases 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 c v6k 3gribckgas+o+sl+ 93in0 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 capacitance yrotk.g q:9u7b/n( b*cz3 mlgboth double in an LRC series circuit, the resonantz7gcmy.lro* u(:bq nb/t9g3k 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 circuh-5wc rw +ac9qit 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 RL7 gpg.;ni s0/ ynm7xrtC 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 fieldp ;guz,cbsef z6nl9:h*i e z88 m.dz:e of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie6n 8d,f gc.z;ezee i:9b*sp8 zh: zlumld 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 radi 8yfe ky*2(q3 i9ramlzus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pl( 3lz8 yik ey*m2qr9afane 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 unyz sy;0ot4u s9uw+8z r8zsup;iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo9+ u4t8ou;z zr0yw8us;yszs pp 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 loop is o0f +)t acsel 2i:z+obreduced 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 coix5r2t8o5 k+ afn/ndwd/ 9 yatsl changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame w q yejk/ excvf c*d o2h;0xy,)r:50cptith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0p)jh:0fc* ce t52/key, xy0rocxq d; v.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 wdxu/uo*7 n15hgevi7 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 a3p**:f7.hxvh c q kegund area $0.20 \; m^{2}$ 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 h2eeu2l 93tz fgp sxs524a;erporizontally at a location where the downward component of the Earth's magnetic field lep af5sg32ut9 p;24e e2szxr 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 atlou4j, u67bes a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fju ,buo4s67 elield 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 cj;;-l j+ gyhdd-blc n5ross-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 tur nzphw qcqp- +2;7l;hkryo)sex* ,0anns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80ffb -b :ne4r*k rectangular 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 loop rotates in -f4e rb:kbnf*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 wire7i vpbe 8rt+z, 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;szjgw xwr /i *7x)vg* /gfcev2*f.mf with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Iw/rv* fc/xj vex*)fg7;*wmsg2i fzg. f 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 g4cly o .lvf83wenerator with 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 a resistance of 6.00 W. The motor operates i wj*7 3*qiytwon $120 \; V$ 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 bt9 q3wo,bbue /67 vnzejwi+y9w 2or0 of 6.00 W. The motor operates on 120 V AC, and when running at full speed it g3rj7oi vewy+ 9 uo 2b bz9,bw6qw0etn/enerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powk;5j;5(ua/*q7sliothr x ptyer supply. Th5h; ;pkx*7rtt( iua/ 5ols jqye operating 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 244u3t- fabol2h9tup m4-V power supply. The operating current is 1.0o9lf 4bup42t3 -thm au 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 resistance 6.0 Wwc-*f mh .3*)tdjf fwp is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whjt.w fp*w3 dhc*)f-f mat 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 nh+y l *cmyo+m01 d*; dqqmt3cseeded 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 xy; ,o w+ 7 xhagg8sl1vwc1u,ehe+mc(14 A to flow in the secondary. How many turns are in e1m+ y 7 gl,(c,xwo+1xhheca swg8;uvthe 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 r3zz+ t-zqu p(y3mzn/-xmd y; in a 110-V primary if the 24-V secondarp- 3y dz(x3zm /nuqtmzrzy ;+-y 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 tnal)(. /gw f;iva6sg and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current nls a.f(gw ;at/6)ivgin 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% effic ccs+zxqk j;932vi5gdiency, how many 3cgjq;2ic kv d 95zsx+amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mAw0a*z17creq1,2+ jvwxkq x *r; ksm pg. The primax201vj wewq;+gsk * *qmr xpr1c,za7 kry 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 t3 i s,isi )ds9 1q,z6x sdy;bxu(lgz4gurns on its secondary coil. If 120 V at 2.0 A is appis s zd1 y;ul3q6, ix sd(xgz4)s,igb9lied 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 tur+.i dll:l kn2 k5t4ixqns on its primary coil and 300 turns on its secondary coni :5tdl+xlkkl24 iq .il. If 120 V at 2.0 A is 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 aimjpl6 i7 ;)es xkk/k7nd its secondary has 200 turns. If the input current at the primary is 100 A, we can emi/exkk6 pi 7kl; sj)7xpect 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 its secondary has 200 tupll 5m121yv(g/n dnporns. If the input voltage to the primary is 100 V, we can expect the nlp 25lg(1/pymnv do1 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 transformer has 100 t8hah9)zo1c pdurns and its secondary has 200 turns. If the power input to the primary is 100 W, we can exp)zh9dah co8p1ect 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 stzbmhamjf 2*-,v2 oxlj/z,q5d kn 7g 57yx hc5bepped up to 4500 V by a transformer and transm vl5b5czm kodhx-mzh*2 n 75a y,jbgxq,27jf/ itted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallyu8yhy t lxphu0-k+2hm 6nwkzf;;*0st stepped up to 4500 V by a transformer and transmitted through as8 tkh 6tkl-x;y2uywh+m fu*00p;hnz 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 voltag 5n aakwrsy* ) z7/ft/,yj,7z8sxc1sao tydc2e 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/*taryyzcxfto cs71 ,) 78 w sna5kaj zd,/2sy lost in 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 has a total resi((kach 0 gwi opc8s31ustance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the ti( c ukpho8sg 0w31(caransformer 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.c 9b2/k1vw- 7u9 twfq,y/ dzwppojft, 60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the bfwu j/dcpyv2/zk 97 f to,w-w1t9pq, transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power woulv wlvei-p; 3)kd be lost if the power were transmitted atpe i;-v3lw) kv 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. It is to be transmitted wn *bdt) 6c,gummk, 5ron a line with resistance of 0.60 W. To what voln bkc6m w ,d5,*)trgmutage 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 5fxmy9 v+h 5 rix1ur:cpm1w,j5.0 A. How much energy is stored in the coil's magnetjchf5,:puy51irr xwm19v +x mic 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. Wga5hi*) hb;ejgeuc 9(hat is this circuit's ti)hghjgcea;ebu5(* 9 ime 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 voltage6k t4 dme+9mou in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is t*u.zjqi .v.yxhe 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 outle7; *wwma2im6ls qr/mj t. What is the resistance of the lamisrl2; jwq*ma/76wmm p?

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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. What is the peak x6,r0wv;x dte tbrr0i ,b .yz9k,af.jcurrent through the0r.ervbwr;j. fxy,0 , t tzka x9,d6ib 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 conz5y xzk1tc 6,wnected to a 120-V ac power supply. What is the power dissipated i5,tkzxzy c1w6 n the resistor?

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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 resisxrw,5 7sk u 6m;uw.vfdtor 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 resisd5rn 56zf0ki0 am 5tnxtor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resmf ec dn /-sd416*y1 z2-yhxd;a naebfistor 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-rv*i /( : p*kquqzb;xnmH 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 reaulx3z7(94 5p: a cbbovxq no7dctance 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 have 14.0 W of inductive reactan1slfz- wgcs 5u +w4.bwce?

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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 forzu5w+ ;b5 v0h p54jvghqnm4w+qbt 9h x 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a u9;)ggrc f6giwe d-82dmi 1mw frequency of 20 kHz is applied tc-) mmrwu62;9f8gieig d1wg do 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 duex* *zco 3x,x0yvb; cwj 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 rea(;bz.fim8 e,bsfc vu , g:sl)gctance 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 nekg*6- .lm:: ,lh ctazdv2ris oeded 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 10/kdl57cdkc n0iu7aj, t, ,frk-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 0.0 bfk:kyye(v q6it )r7810-mF capacitor be 100 W biv ft (ek)yy7q8rk6:?

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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 100-2t1yl5x,jk;n-c cry pp+ eei0 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, 15.0 W ind6/0;ywa izdgquctive reactance, and 10.zw;iq/0a dgy 60 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 1uxw,puv)2qw8 x5k(u 7 hx qr2g00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser52k (wxw,rug7hpqv2 u)x8x u qies?

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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 1bn,w ( n/yee.i00-W resistor, 20-mH coil, and 1.0-mF c/enw, yibe.(napacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is t4m vlhm 1fyw(bj rg;6qst5,i; he impe;;w,4v jtrq (6 fmm5gbihyl1sdance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is con e- o2 -bkpm f2lz*)ua504d6qzpeu xmvnected in series with a 20-mH inductor, what is the pp)lpbm 5-ko-2u xeva df6mzq2u40ze *hase 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 circuit with a 20-mH coil and 1.0-mF cztw7 /5oy6yu1iwi u) papacitor for a total impwwu6zu7 5)/ yytpii1o edance 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 wdl 0 hh3 ymz6wr1nej 1u njht50(ja2 jlg1f0,dith a 100-W resistor and 15-mH coil to genwm(10jfh 0a nhh5e3jyud1zj,g1l 062j rtdlt 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 inusg8wmt gm9gt 3x02p7 ductor at 5000 Hz for a total impedance of 40m92 g xgpt38gt 0m7wus000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at,ppw;k7jfog t2 .tbrzc 7 cv0: 1.0-MHz for a total impedance of 15c7 c jtr 2pwzgo7tk:v;b.0, fp0 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 wv vsqv.z0gmvj48 j(cn1f/ h(uith a 20-mF capacitor. What is the impedance at m. vcg8vvu4sjj((h1q/n vzf 0 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a t2 qrvxa;-yt :+za) lqtotal impedance of 45 Wtl 2ya)-tzx +r :;qaqv?

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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 c0u3qexp.4jp)umq a v /apacitor at 1.0 kHz for a phase ang4p/aum0 ep3 .x)vuj qqle 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 for a tp rmu0,do(* jpotal impedan*,p o( 0mprdjuce 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 with a 100-mF capacitor at 120 Hz. What is the ph34wxrd d hm8hq .gw8m/ase angle?8 dwqh. mwh438xg/mdr

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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 a e75 l: vqyoc0sotjl: 8c,pi k7100-W resistor, 20-mH coil, and 1.0-mF capacitor are co70pvq:ckel:8i7s t jcolo, y5 nnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor,2z8w9 d*xpcrqetb7k 8tn .0)k tdf5h c and a 0.350-H *)cfd0te7 w9kb.z8dk25 thxn8 qcprtinductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30o0 7 gophhzr (2yw+6cx W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flow6o7ph2+oh( cyrxw 0zgs 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 seri juv 6.t1k24ivxj-q mees RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to m 6etj.v2 iuj x4q-k1va 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 resistor for a pp6,5rmlkm n+qhase angle oflk5n6 mrp+ m,q $40^{\circ}$ 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, 7m1yg t+0f smlhycs/* C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sour1 fst/*m +ymcs y70glhce?

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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 circuit1k8-ql wves)x with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powwl8vx-) 1ekqs er 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 is:x. zp rheg fprye *f-5yve1 2op/pf5) $63^{\circ}$. 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 ofespiuwqa.z cg;f, / +wc+hl-el*hi 04 30 W. What is the powe +i/cg.wcwl af,h4q ;sp*0uhel+-i zer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a9gor(m mw4(dat 8gp *x series RLC circuit containing a 50-W resistor, a 10-w 8ag9td oxr*(mmgp4(mF capacitor, and a 0.45-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 frequency of( )g1lzar +i26e lpag ei;2dgkwp0cb4 a 1.0-mF capacitor and a 15-mH coil in series?w(ka4gd ; l2eplzg ri a6+2g1ce)ip0 b

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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 mfnh5 nl+8 h4qin series with a 4.7-mF capacitor for a resonant frequen8lhq nmfh54n +cy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resyom,wro+ 5:ibonant frequency of 1000 Hz?:wmr+,y ob i5o

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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 bi3wx9.fp ae* w g0;nxce placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of3gwinpae09.f* x; wcx the circuit is to be 1000 Hz?

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