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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 ara f;xzct*5tnma.d 13o e 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 ind*b.j7m td mq(n ;h ea(k4hbqy/uction states 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 coir881l e7sk hxxmf,w1 xl produces what kind of change on the ind71 f8k1 x r8xmh,eslwxuced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field csvgl8qn ;l 4jyq3 )y6np5; jythrough a loop of wire produces what kind of change on thpq j8lc5y;yq64n s ygnlj;3)ve induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on th6;8v9 cpneu 1hcmofxk zpk*ig 20b,t ;e induceheuv9i,; b 2tzg;*k6x c8npmc o10pkf d $emf$, 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 magnetikzhrc6e2: htl m e 3.r7f.re *tl2-kqhc 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 (tch t8b(enq/po zt3c g8:vmm/b9k9rcurrent in a conductor will be that which tends to produce which of the fqr mztcgh9n((8o/v kpe3ctm:tb b/98ollowing 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 magnet is hel 3x9g)0mchru ed above its center with its north pole pointing down. The stationary magnet induces (when viewed from abohm) 09 cxeu3grve)

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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 horizontabr;k4esg9/b1mz yx, w5acd 9 6ejm9thl table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet in 5bcgzj,h;m99my9s6e/xak d tw4erb1duces (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 regioyzs,/cfs u7tx733d jwn where the magnetic field vector points straight up. The magnetic field vanishes suddenly. s7ftsxzd3 /7cjw ,yu3When 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 makimel8- tz//6gw jq8ugnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe8t - /w8jigl /6qkzemun viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tablkhr c i1cf6 71;:+zklbv-f2h fxfvpr7 e top in a region where the magnetic field points straight down. The magnetic field disappears srfc f- zc7vf6 f;vihh 17+rkpx1b 2lk:uddenly. 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 ue7/t6-i0uk hwsj g5c and carries an ever-increasing current northward. Two coils of wire lie flat on the table,w/6s7 c gk0uie-5 hjut 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 pgwyinmmf.15 zr j)o)7ole entering first. As the north pole enr5fi1) o.mwgzymj) 7 nters 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 wue nl xbz wt6ic. w4.j 4gshb8gx.1,/oire is rotated at constant angular speed about an axis whose direction can be varied. In a reglgx. .nwsbi1hwg/j u.co684 b4 xt e,zion 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 rotatebrzfk i6s y+m4 e+nod..jdo84d at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, .dbd4e f 4+kmiyo s. rj+8o6znwhat 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.gcrhg 3qyr1.9
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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 er+f. xip/t tl(.nq3z$emf$ 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 f:2i tbsy 0hsss,afjir 1d u/-:ield. 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 q* )lvo:.yknb w yw)u*the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerningy)w*qou b* w:v.k lyn) the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloci 1gsln4fp peffp .:*m7ty $\omega$ 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 generator3d;6w7rwh1szt tt.ex4 ck y( .ceriz- transforms

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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 tmp97 ,tef cd3each second. The frequency of thepc mte93t7fd, $emf$ 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 uhuud/j7c+fp)5vv6)-80a.d h mwpgmhy; nbw q sed 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/k 1pnqu u5kt.(y j3te 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 contains more loops than th afi96kz, daj:8q4 (gc rfkaa:e primary coil a :4kfa9dagrk:c (z f, 6a8ijqthen 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 loopffp 4kje74n,: +p cts)vzs,hy s than the secondary coil : )f zenpp,+jcksy7h,t 4vfs4then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp and4ge.- etubtul1 /deo8 -7rut

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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 a /jo* my2;tf dpiy0y4circuit,

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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 conwl8 pp/s3l0v fstant terminal vol vfw8 0pps/l3ltage. 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 serep:zhc m7f(95zui i9 ries to an ideal battery of constant terminal voltage. At t7z rf(5pimi e9c:zu 9hhe moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance Rg,jn ya*d z x9 c9lh1s5vuj;8b 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 cce84 gettx,6q*f6mg u onnected 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 se+6* iq 5h fygsx:xgs;sries to a battery. The time constant for the circuit represents the time required for the currs ;5*yg+qg xsfsixh: 6ent 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 battery. Thdtf2n 9 -yk7sxe battery is suddenly removed from the circuit. The time constant- skd nyf29x7t 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 units excepti p(fo9)9bxl, v/iuwt* ka3 mf:

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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 a0 a)1ln6gd xc)(i5wn:a:cesnov jng+n 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 supply. In this circ1rn q8qmwf/aa(4hknc/s6wk 6uit, the current rcs(naakqf8 kq n 1664mww/h/

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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 x0q4a 6 zrw9h: f0 xhg6esda6pcircuit changes by what factor when the frequencx:6a0wahpqf69r zsg6d h 4x0e y 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 inducto,rkq+a;klln7 r is doubled, the inductive reactance of that inductok7n+kl l q;,rar

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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 theaq nj1q3cao+ 83+ndeu AC voltage across an inductor approaches zero, the inductive reactance of thqaecq+o1d+3n naj u 83at 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 cem ak4- aw.b7qonnected to an AC power supply. In this circuit, the curreb7 4a-k.w ameqnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react(;jaw;v6.lhtvj4hiixh j v -y35 iq2eance in an ac circuit changes by what factor when the frequency is tiwvjhjh-x (a3 4vviyil 5ethj6.; ;2qripled?

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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 approaches zei1m re,u8vb2wro, the capacitive reactance of the v,m8 1bwrui2at capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induxkexn:cp( l85 3shq o*ctor and capacitor in a RLC serieo8q *k3xxh e5lp:n s(cs 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 gie ;+nfyjj+*an 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 circuit. x*i k-/cvd ih utc/4+;ttd1 kvThe impedance of the circuit increases if R increases. When is this statement t;i tktx/tu 4cc- v*ivhdk1/+d rue?

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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 zels gy9k9:gt0 *hoh 6the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases ifgfioadv gs7y-n+ 25-b5nk p ,d $X_C$ 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 thev*5 kgmtd .zd; capacitance both double in an LRC series circuit, the resonant frequen.mt*dv; 5zd gkcy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonobuhu 8mh.-.oance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs /: q uyugb(48g op0cmn;osnt0x s+ mv,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 field wn9p8r 7b1jmiof 0.20 T. Find the magnetic flux through the loop when the pla9jmrwi718pn b ne of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unia5ffbg**/ yumform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop an*/ufb 5 gfaym*d 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. b50.ewzrmt n910 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the z5 ben.wr m09tplane 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 are uiz--8x ebwf-u s1(zda of an adjustable 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 coilu4wny7n( ldd+ 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 with sides 1)8ydb(is9 kv m8 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 siv8(dyk s b9m), 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 wir5y+1.hp) wx wxth 1w/bh 5qigqe with 15 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 areat 7mq hajha4m4adl zig3(s1u70utm 09 $0.20 \; m^{2}$ 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 a location where 4h,l6 wpr 7mjpthe downward component of the Eart pp 64r7wmh,ljh'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 at a con v gw l5*,lk9x +7y-t*okruaknstant angular velocity of 2.0u59 yg lo x-n+v7,la*tkrk*kw rad/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 and a cross-sect* y)deky6r 1w7:( lphdgtt0fpional 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 dui e,c;l2ont .x7xzf +v)gzr 1s-rvn w*(il9wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loop mtbv(cvq.zq uai2h ac(;4w ;e0 kiw35s 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 a unif5;cm0a(3i.bzeuih2( ;wqv4akwvq t c orm 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 wircd1grp( e3hh )sz7t* gp.z+/t)jfsrt e 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 ouz.gwfc n-(f k,tput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availablec( zk-,f fwg.n. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a el qob3bv86yrp c*9.fmaximum $emf$ 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 operat0 y7ht4nk4iwnes 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 motd 0,zvo+ l,cyqor have a resistance of 6.00 W. The motor operates on 120 V AC, and when c zl 0,,vdoy+qrunning 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 interna 86d v hguo26wsm)5dckl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr8h 5d2mkg6) cv6dsuow ent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-gur w+q;b/s(/j( ri-d k p:gqhV power supply. The operating current is 1.0 A at fulgjqw ;u-/q(r(: /+ihsrdkbpg l 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 res.i0q5tp uro4erfue 2)istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha.2que)o5rep r0t4i uf t is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prima20gwp6 k4+u st8ga j1bwn8hjwry 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 transform;,+ihfbaf w u2gu e1q)er causes 14 A to flow in the secondary. How many turns are in thw hu+uff,a)b2; gq1iee 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 manmgo 82o2w my15bg3 otvy turns are necessary in a 110-V primary if the 24-V secondary has 3motm1o5w b2 ogv2y8 g100 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:v2:ekdj0gebt 9 0xcqd+awe s -6afw( a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?cgfwq-t0 wxa2 dke:(:+9bvesje0d a6

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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 trans-t k5z8 ksczp4fd -t1jformer. Assuming 100% efficiency, how many amps at 24 V can flow z fs8tc- p-d1tkk4j5z 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 a nz6tj14pb4ng t 10.0 mA. The primary coil6bn 4gtp14jnz 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 andu*tbp uhq d2+ :)9owbtf ygkrm*;60ql 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primaou)q 9*;u 0th2kl yt:rmfb6qd*p+bg wry, 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 azg.jlt6wd1*+ra ll 5 has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondaa61t lz5 wg l+.adrjl*ry?

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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 iz4 ge7vymhvjyo:dkxl2 e2w1d7qwy i ,n05n./ts secondary has 200 turns. If the input current at the primary is 10k xn yv17 4h72eqv l/n5iwgyzoe2djm:w dy,.00 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tranux*ifwlqaa b.q4 i2lh0t)/ d+sformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can 0au4.iaf 2l+b xil qw )*th/dqexpect 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 transformer has 100 turns and its secy9.32 egtzyd 1ag8kwsizu9+ krz,n,f ondary 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 frictional lgkzi,1f+z2 z y,s9e ay. w drgk38ut9nosses)

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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 us96sr: s; ifh)dfj mio*ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancesi)f6 *ji smf;r9hd:o 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 cur+ilhcb;i2 4 ;s-dhkosrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power link2dho 4 i;;ibs+h-lc se 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 voltag8wil)lhqs 5v hp+o+f4e is usually stepped up to 4500 V by a transformer and transmh5i+q vfhws+o84) l plitted through a power line of total resistance 1.0 W. Find the percentage power 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 resistance of 09s(xe30 sq/9n9g4 h bccy+usnv weu:r.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 w+guy9u(9/ csrns0x n ese9bv4h:c3 q 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 resistanc r32an)a.tj:gqrr qslqgm6)*e 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. )mjgrrlq sgq*a2ar)n63t :. q 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 d1)wld,pm27 d ((caxk tziqve1 own a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V inkt)7a 1( l 2pwedm cxv,z(i1dqstead 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 gener4b))r8jrvhiqc- 1s dcator is 440 V at 20 A. It is to be transmitted on a line wi)c q8b-jhc )rdv4 s1rith resistance of 0.60 W. To what voltage 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. How much energy is ;h0m5/*x3 e ol *qt- nvnenawfstored in the coil t0/e fl;vnx nae-woh*mn* 53q's 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 6.0-W rl+l7mf- 9vnm *:dk 9pevvh (poesistor and an 18-H inductor. What is this el:p9mv+-h npm7 l(*od vfvk9circuit'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 circuit where thekuqlp+zuqz* 5 81kfo2h,b : ;iy/k pyf3*uowe rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cur1o/ f-s,ptx3q7vja ppw;w z1nrent?

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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 resiz7py1y5)roq j rnu*:mstance of the lam1 :)jmz nr*uo ypy75rqp?

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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. W p 3sjdt h3ufl*,gt(0mhat is the peak current throd t3(jpm * sl3g,ht0ufugh 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 connected to a 120-V ac power supply. What is theia pcs9tc3)q ) power dissipated in thc) qct si3ap)9e 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 resistor d q.0r fy;,jfdis $I = 0.80 \sin (240 t)$. 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 ipzw a7l,)ft g6y2 lic/s $I = 0.80 \sin (240 t)$. 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 o,yx+* yuzg(i r(3)sglmh*m presistor 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 indu8q riz1mg06tpcf v 1 u1*tqot7ctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH ct-q 52kfj +mlcoil 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 reysfxw8 i.l6 e3actance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessa.;8lu3p vk ussry 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 in a 60-mH inductor when 120 V AC at a frequency of 20 kqd 2xkul rg +b3fz+g96v5ce(xHz is appu3 gqdzkv 9xr(glc f6 b+5+e2xlied 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, 60* kvlw2xd6, d8o4l;ehw1r kqy.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cjp ct7-+wpfkn/. s es7apacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kH:9e+kkv r:s+b gxyfgifb/eel1 u(c. 6 z?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency doep99emcbmr;* j s a 10-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 capacitoj9ea8vam eat h-xv *na+:6b h7r be 100 W?a867aam9-ae t+x vj*ebnhvh :

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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 ca s;t1uubi41g fpacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W ,+yisfb-b 9g:cu i+lzresistance, 15.0 W inductive reactance, and 10.0 W capacitive ib:- u,yblf s++cigz9 reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W d5liy8 ua wrw:5w48,qyt fun2 resistor, 20-mH coil, and 1.0-2 wyi5q:nwyl45,wd8u 8atf urmF capacitor are connected 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, 20-mH coil, and 1.0-mF wn,,i; 8v jp8y c;yhyjcapacitor are connected v8 yy;npj ,c hj;y8,wiin 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 the ix sg k-5n i6qhx0d.w7impeda5 0.qkihxisx- g7w6dnnce 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 connected in series with a 20-mH indu:s: n5mmy mlhw.ng3 h5ctor, what is the phase angle at 1:lm55mn:.ng h yw3hms000 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 20e24j 00 kdnq8t pwf nwzv7cuz60cst ,--mH coil and 1.0-mF capacitor for a total impedance of 100 W at 150- qvc2t0z 7wc,u04n 6 pn twsd8zkjef00 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 series2uh4*d. rqp qr with a 100-W resistor and 15-mH coil to get a total im rqd*2.4uhq prpedance 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 bxs)xnbax;o.;q2ft thm(rh uuh5; :4pe put in series with a 450-mH inductor at 5000 Hz for a total impeda:nr(x.uu;mh hx ;tbf;a s5o 4t) xh2pqnce 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 resistolrpn 8v6ee6/wl9bs+ nr at 1.0-MHz for a tot lvsr+9 b6wnen6l/8epal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected bb95p r* cv4)ben4;a aifvx0r in series with a 20-mF capacitor. What is the impedance at 1000 Hz?pbvcbvxrai*904e4r; )fban 5

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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 ay6np/ qpj6+mnt 1.0 kHz for a total impen qym/ pp66nj+dance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series witv.sse-bzoy pc+ xs 178h a 10-mF capacitor at 1.0 kHz for a phase anp+z-s1 7ex b8sco. vsygle 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 1.0xykb3,9k, .9j duoicfx ga-z7 kHz for a total impedance of 45 k z,a b 7i,f.dy3kuoxc9jx-9g 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 rzv/06 d o-bhbphase angle?0- b doh/vzbr6

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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 16zt5iw/(bj j zo6l y/k00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected zl i6j5zw/y6jbt(/k oin 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 consist;;fsn.vv9 v vcs of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circu9;c ;nfv svvv.it 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 30 W, and an inductorryxs)).lva pt9v kf (/c ujh1( of inductive reactance 30 W are connected in series to a 110-V, 60-Hz /.r()p)fs lx1v hjy cvu(ak9 tpower 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 containhh u;ik2 i pp9nw43f7y)3xyg j2hww/ ring a 50-W resistor, a 10-mFw y)hpkhh fnwgw3x293ri2 j i;/4yp7u capacitor, 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 with a 500-W resistor for a phvyyrb: v9ds dnb 5e863ase angle on s6e 3bd9 y5yrbv:d8vf $40^{\circ}$ 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 = 200i cat+30ijyrz ro36s5j s fowg+7/ ;ts-mH, C = 10.0 mF. At what frequency should the circui/;s 3i3tof0yo + cgair js5j+wtsr z67t be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an sw;r+5uwj2z d7w4nq tzc y 1s9ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 ;wz ws1rc94 t7y+su25nwz qdjW capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cirdwv/vx -s7 -z lf *x( rzqja46m;jky*bcuit 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 and a resistancke*m gqs4u7zrec)ucq : f*1 y+e of 30 W. What is the power f+ s:ue1*cgyq 7mzu *e 4)krqcfactor?

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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 ;y :gjbjio 2 1c6j7nx nvce9p7for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wy7nc1j7 xjg:9vojnb2e c;6iphen connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.guxw(j 9 k+s/k2* ouyl7,hs20zk gt of0-mF capacitor and a 15-mH coil in series?z u2w* uk +xs/97og2 tgo(lyhskk,jf0

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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 with a 4.7-mF c/mo*-gwqax )k -r5q oaapacitor for a resonant frequency of 10 kH- /gq *5o)mwr aaxoq-kz?

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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 inductonzm)m; l21*svmxu9p lr for a resonant frequency of 100 mn; xs zmlv)9m12p*lu0 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 serr b66zc00k k88jm;ymtx 1u ;fhjt kit4ies with a 30-W resistor and a 40-mH coil if the resonant m0kcufi;t;xz jt8 kh81 k yb04mtjr 66frequency of the circuit is to be 1000 Hz?

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