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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 a u:5jrxv4ih8bidj*+f re 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 thel3 ez4z)maj .)2 ri3kpk9cn bokc2w. d:7kuzk $emf$ 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 kin.p 8 y asmuqi)i5gx43nd of change on th ps8nium 4 yg.5)qa3ixe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic fieolkeeh81+,hl ld through a loop of wire produces what kind of change on the l l1koh+ ,hee8induced $emf$, 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 qkp- / tao8h7lmis27zwhat kind of change on the inducqahpt8/ i7k ml 2o7zs-ed $emf$, 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 frhrh n 3-k-hple 2mr7n6om 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 induced current in a s.d2 tat rjc30 trof5,f3g.uh conductor will be that which tends to produce whic 0.,5dc 3jfrot2rafh3. t ugsth 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 magnet is h;hab/r- f s38 +v-xsqx+whyxheld above its center with its north pole pointing down. The stationary magnet induces (when /v -8shq-hw3+frxbsh ax +;xyviewed 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 horizontak /85u7 ifq5r*twbgre/6kyn m l table. A bar magnet is held above its center with its north pole pointing drg8r/ y6t b kn kuf/wem*q575iown, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnecp i.1.vvf7wxtic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, whatw f.ix1pvv. 7c 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 magnetic field vecto:jc fzyc9spx3.r apqqw845 st ::dbs7r points straight up. The magnetic field suddenly grows stronger. rsf: cqbx 7ypptsqs8w :3:cza 49.5jdWhen viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region +tkc:cf(r7,28tld cboc;ip a)wjj/ k )pz8tawhere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced 8zl2 jct)/ kj(oc; f: , t)artkd8c7 bpiwcp+acurrent 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 and carries an ever-increa4o+i7lo k7s+y9 qxiltsing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the il7tiy+o +ks4 q x7o9linduced 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 wiqrcyf13l qmxxiq *-53re with the north pole entering first. As the north pole enters the wire, the induced current crqli mq f353yx1- xq*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+h.vl jl6pzj . at constant angular speed about an axis whose direction cl+ p.ljj.hz6 van be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rwx /rvm+bdut 30/y l2eotated at constant 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 ort3el mb/ yu0xd vw/2+f 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.4x kx2m yek 43(9k *iieq/h+1ep.uivcmfmh*a
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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 th2 x 5o5idg:imjat 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 magneh3 )ycpz5ah y:sikb-n h53y5otic 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 injpl+6 7xork q(1tfh+ j*ff w,r the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down +o+p w*rl1,t hkrfjj(7 qfxf6. 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 bar4xzqvzy 7gm k** s-0bn 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 transformstr)hme)uqdyi79y( -.0jxrb l

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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 frequencl -:evrl0w pyq9,q:da2f se5h.qi ye 9y of theh i,:e qfpl-09 aqerl5 .y:yws d2ve9q $emf$ 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 devicv7levust52/bea0+yhnb f3 4 ce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a dep(pn1ed4lp 3ivice 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 b0- onpv3x5n k/9y+ia(z ojizcoil contains more loops than the primary coil jon0n v3xpzi o95iy a(+/k-zbthen 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 s1 : hx0exfqh/l.+-+i xjqqlathe primary coil contains more loops than the secondary coil thaq ilfhl+qxh.-j 1e+q xsx0:/en 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 powe;kyh s -re,wi*+dt.m pr 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 resonax;wjxcd0 ;h j4:-blpd*u vn1 mnt circuit,

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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 inductorgldw si*z+3*r are connected in series to an ideal battery of constant terminal vs+*rw l3zd i*goltage. 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 connectsv7tfdsjd kc;-mczk1 8o a-;3 ed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batter zo;cs3 dav-;t-j8fsdk 1kcm7y, 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 ab0++ 2dlf+leieuf/oih8u ,zv nd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tz9jvw,.pgo9ds +2na fo 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 hy.ln0 78dvgxs0v i2 pa battery. The time constant for the ciy.gildv082 npx7h0 svrcuit 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 inductor are connected in series to a battery. The batt .z8i ,yv-aqx4veu ao4ery is suddenly removed from the circuit. The time constant for of the circuit represents the time required f 4 vxyaq4ev-.azoi8, uor 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 un-equ )s**is :g fjdc*sits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currentm5q 9cih 9-f)vzp*vjmv b 0vm)

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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 co)wi -*.k 5fv (hatkvf g2gyy:innected to an AC power supply. In this circuit, the curren 5g-t a.fghwy)i(k*kvyiv :2ft

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by7a6k rck-g;f d what factor when the frequency is tripled ;rkdg -k7c6af?

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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, the inductivelos qb4 yia.nkj58v 7: reactance 78k jl4y .5:vnqis aboof 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 voltwo rrdl6yg 6mg,d+.j6 age across an inductor approaches zero, the inductive reactan6+wy,6j 6drmg.dgolr ce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the currezm;wb f5e :pb(ntbb (wpfm5; ez:

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the cla4c:: c1v2drp ) ej ;492a xhjltmcifrequency is jc vae2:ccdj4ai1 :m2rtlc p9);x h l4tripled?

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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 w r4 2hjka *:c)quui*mAC voltage across a capacitor approaches zero, the capacitive reactance oq w)4ha2:i*uc*m krj uf that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betweenx ; 7udharspu rkmu:d()fx8:+ the voltages of the inductor and capacitor in a RLC series circui7hfr;a)x8 musr dux (:duk+p:t?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is2(m xgv orzgy u 5n3wtdv.5h:2 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. Thqujroz .)k 7 )h(qy4s q*mwi.te impedance of the circuit increases if R increases. When is this str hoqm ( ..twukz4*s7q))yqjiatement 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. Tq( 1( 5a:ghu zz5inrn9owysf ,he impedance of the 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 circui 5w*i5f +ngi+tc:mmdgt. 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 both doubleh3:-edmr 6g*smpln .k 0yxfyp2iuk x5np6( :c in an LRC series circuit, the resonant frequency of that circuit wiun(6xypmr i. *ep:l2s px0 36gk -hdnmkf 5cy:ll

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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 appliedg lzwk 8vvl.8v9.p4 ie5l; synddak 1+ 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 k;dor t9kj*x7 RLC 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 fin jpjl+;a c8 iq+:nrws);) rmpeld of 0.20 T. Find the magnetic flux through the loop)p );na8j+i r n:s;qlmwr+p jc 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 radius 0.10 m is rotating (u kd he)*y4;npvk6sr in a uniform magnetic field of 0.20 T. Find the magnetic flux through the ;h p()r*6ku4 ysnevkdloop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20-2 x8vrva:yvr T. Find the magnetic flux through the lry:vv8arx2- v oop 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 adjus1:xbkgsu3xmlx iari ;e5bj+g-* z r0*baen,+table 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 coil0 6f)k3hrnh9 t -gbyg4*fs vbd 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 px1 jyl1ir4dsjdc* +zd 3b :axn68h5ysides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the ac+1ix:* ybxh 4j68yjs1npd l ar d35zdverage 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 andmm7aps6ed.x kxnen4;re+,mj k07 l9z 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 arw7y :tie67j+gcx r*t9 c3x0rgg w9rcmea $0.20 \; m^{2}$ 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 whetwq u()bd,y 77v(bfjfre the downward component of the Earth's magnetic fj duf7vwqt()f(7bby, ield 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 thaz a7m6l6fnw9 z b/lrx3t is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant m bf69 z7wn/6z amlxl3ragnetic 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-sectional area of 1fjre5a 8k ,9yhqurk6ts,o8 n$0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofp (i- oom+ 03kcz ((hfb:ym5f4mtljdu 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);q. lb rq5js1k5afm/+.i lewby7gvzs on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis paravk57 +q .gel mlz a1fb;/s.ib)q5j ywrllel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 a:a4 y*e2 chyfturns 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 od jnzta;.7:7m-dxxd uutput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. d .nud:- daxm7zt xj;7 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 maxibbvlh fqp0:p 011h n vq;5d*mimum $emf$ 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 motoai m80(u1j(5amjvycth/a;s rr 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 moe4s( .9,rf(2w cmyrsh5mnhmp /ot mg-tor have a resistance of 6.00 W. The motor operates on 120 V AC, an( m/y fm9(h 5 scm4h2,o wrmrsg-t.epnd when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal respp h8m;p :. nq0uym,hzistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-uh p php8y0zq.m m;nu,:p 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 ,ijddlx :/2uu+si+ye i (d5 f(qb.qaaconnected to a 24-V power supply. The operating current is 1.0 A at ful:s (uiyejf dq/x+.lia,a2 b(didq +5ul 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 W is connected to hmm, n/j4.4qobn )md fa 24-V power supply. The operating current is 1.0 A at fum), bmf44mjoh/nn . dqll speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a hiaad2g (7ws0gqp 7g7 q2 vjir03z/w tprimary 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 ts (h qwg259lvfwr1yw;o flow in the secondary. Howlh59 (2rfgw yww1vq s; many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in - yd aym72g07,y jwp. d8hxejta 110-V primary if the 24-V secondar. ah0 y8 xtem7wjp,dyd7gy -j2y 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 consih f8.pl6p,i0qm-v3xuxbco.ze-k7 f h sts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the 8,-hfhpxpvul0kb.qi.mf 6o-3z 7cex current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transf 0.uo/omkmj2 lm/hdcf/ , b/stormer. Assuming 100% efficiency, how many amps at jlmd 0/h2c, f bkt./u /mo/osm24 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 750a c*xsc dh4i1xa /x,u 8y90wij0 V at 10.0 mA. The primary coil operates on 120 V. What does the prxx8a 4*cy9i0/us,cix1 hja wdimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns p o mo4sp3 m;yq1i/z9von its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage ioo smp/;1v3imz4qp 9ys 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 30.0k hih2d. ngy0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cydkn0i.h.2 hg urrent 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 turne eqdg8 w h5ik6i) x5v)s:mw/,b2vkufs and its secondary has 200 turns. If thee, )h /6w5kdsmb wkf2eu)g:qv 85ixv i input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If ytat8yy2 1(st33lyx10 agi uu the input voltage to the primauy8yi1 32yy ta t(xgus 1lta03ry 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 transformer has 100 turns and its seconij x578nlf byt1d.o1mn ucsf10/gcw9 dary 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 losni 0u1/d5s c 7byxw 9nf1.gc8ft1oj lmses)

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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 volto bt+zl/v3h :or/ slw4age is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary / vohw tzl4+s3rlb/: oif 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 x82p uyw:ovce* ,de -ncurrent at 120 V. The 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 iey,c :en8-o 2vu*pdxwn 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 currenty950 ie fkz:v8pnz u4r at 120 V. The 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 tn0zeuk4if5yr : vpz98he 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 ;-ov qre33o5qv- otwn 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppedr3vq eo-onv tq5-o 3w; up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission linek2pk aj . 7nex+;gx+ew 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost xk+2;. ew gpekn7 axj+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 dow ((yee1 zck 0gu,y8hp lz:f+qrn a 6-W line at 1000 V. How much less power would be lost if the power we81le(c(+y0fuy zepq, g rhkz :re transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440xk*fzd9bj 2( /dgxjfl, nz74;b ud*jb V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generat*jg*b2bzxbfujf n9 ;x( j dl4,d/zd7kor 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. 2e + p .g(o3l.fy 6lmyx/sapl( qxsvt/ How much energy is stored in the coil's magneylst/2 v/fpoexg. yql + 3pxl.ms6((a tic 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 k;j(e*0zymyf b.;lu i 6.0-W resistor and an 18-H inductor. What is this circuit's ifukl*zjmy bey(0;; .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 voltag 0 m837y gp8spcpl+4gav0wegoe 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 the pel0rel23++: x r -hshcsl 5ynxgak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is theuua3ulpk ,dw(e*/uc 2 resistance of the la/ l3pu(2euu*w d,uakcmp?

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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 acwgo o)28 ug3i n-c6lib3sxqn* power supply. What is the peak current through the resistorq w ib6g3s)lxuionn c32- *8go?

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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 conn ;vuc6oc k1:y(xrw/kn3m*elgz0d)n f ected to a 120-V ac power supply. What is the power dissipl6 dxunrcz* )vnw3y0omf k;/1:gck e(ated in 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-ib +wezke / cou.lujr7r8k04+W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W reswq c4( auti*w4istor 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 resistor :up7, tqr;d dris $I = 0.80 \sin (240 t)$. 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 o ku4)00t m b6cledppa7f a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH cofxu3*na9 6pt oil 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 rbdy3d)c;upegene/ /6v.p0l 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 necessatu jcc0tknd-lw.-n i.)ti 6/gry 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 60s ywa1v/z fi5:qnz9p 9-mH inductor when 120 V AC at a frequency of 20 kHz is applied to it? zy5fqans/:p v1w9i z9

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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 cobqauf s/8g/su8b7 uon20y 1 sfil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance 0w5cnt2nq s;r8 xqqk;of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 i, j2dmaw58-/vrkltspr, gj:( 2qteoW of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have w6)c .e3i ks3q*nybfc0n ,uisvs.q 7xa 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 0.010-28d fvh hazy42oth3b+mF capacitor be 100 W?+yzv8h2 h3 2oh a4dftb

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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 0.001y4ty o.doxs f,1nr/m;)v.6bswn*iy d 0-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W g*dlhcd+jd3jmym 69 f4i9v.u resistance, 15.0 W inductive reactance, and 10.0 W *d gy .m4j m9hucl9 +jfd6id3vcapacitive 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 10os9 a4sus914zb3; 79wvvbsa25i ;yowj xqc vf0-W resistor, 20-mH coil, and 1.0-mF capacitor are2oi9 471 u a as9z 5 ss49vwbx3vf;svjy;cbwoq 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 a5ze: 01 e(m c6yu wvjj(9vdmiit 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesv9ivj:6w c1uje((5 zi0 dmemy?

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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 connectedmfa+29xutr6m in series with a 20-mH inductor, what is the impedu+ftm6x 2am9 rance 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 connecteys-mgsm5 (e0 m,dhmzad-k+-kj x5u0 ;mz +zted in series with a 20-mH inductor, what is the phase angle at 1000 H+d,mut0-+mzm s s x-zzmkge(h5j0yekd5 am ;-z?

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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 coill p;3e1oid5;kz+kuib and 1.0-mF capacitor for a total impedance of 100 W at 15;biz5di3pkku l;1eo + 00 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resis jw+(kp2j b(lstor and 15-mH coil to get a total impedance of 110 lswj2( bj(pk+ 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 .o x8a6/kj fuj;ux5xl q/xobx xq2e3 *450-mH inductor at 5000 Hz for a total impedance of 400006 xxb/je8lk/*o25xfquo .3ujx a qx ;x 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 res6v;0 (uigkjo0 twt/ yyistor at 1.0-MHz for a total impedance oftv wti y0kjg(;o06y/u 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 s *wdj sh9+w0y-mh /gnseries with a 20-mF capacitor. What is the impedance 9dsh-j gw+0msyhn/w * at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor 8,dax(cfn fz;t5g )glat 1.0 kHz for a total ida,( zx5f) 8tnfglg ;cmpedance 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 7gu,xfg 9ip9cwo;p (uin series with a 10-mF capacitor at 1.0 kHz for a phase ag; ox,7iw(cpuf9pu9 g ngle 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 serimc2n p(dfp0zwo0 0vt 1es with a 30-W resistor at 1.0 kHz for a total impedance of 45 zcm0 nw00 f21dpt v(poW?

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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 t7;ld jci0b w0ib:ady)he phase angledl ii;0bw7 jd0a:bc )y?

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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 100-W resiar+uuz9w9 k g2cja-b mq 9v:e7stor, 20-mH coil, and 1.0-mF capacitor are connected i- :9mujcq+uz9we akabg9v7r 2n 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 capacitgc2*( np/kwde 0zv.lz or, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the ci ncd/epw.*g( zk 0v2lzrcuit?

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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 capas.vwyw1 ) b4o5 obwdy*citive reactance 30 W, and an inductor of inductive reactb)vs.y wby4 1wd*5oowance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series 9gl+dwvv pds26s k+ ae-uap2a5 zv )n(RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60+-2pk+v5zda) 92aaws sdv 6elnp g(uv-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 50)qompbd 3 6+ei0-W resistor for a phase angle oi+e6bqo3)mpd f $40^{\circ}$ 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 hi5oieq5 yq);5y*eq. irdn)rrt )wj.what frequency should the circuit be driven in order to have maximum ten y eiq*o5;.5 j)y) dqrqrihwr5.)i 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 a7m le9w53w dabn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance 7mdw5l bw9a3e, and 10.0 W 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 circuit is zy0;4+yv c+/vlval or/d h)qs$63^{\circ}$. 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 andqseo yf9 ;un*. a resistance of 30 W. What is tn e .*u9osfq;yhe power 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 a series RLC circpat3 )wd y(-ftxhx-w jq* 9hz7uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to (dt3*)xjxtah7qpwz y 9-fh-wa 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 - z f0t3di-nnuya. maxrk q,-61.0-mF capacitor and a 15-mH coil in series?ky06 a n-.i 3r-mt zdqxa,-ufn

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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 serv4 . p3mrf(c1w5zufqo ies with a 4.7-mF capacitor for a resonant frequeqvwm (5uro3 . cpf4z1fncy 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 z0 3olg9koq f: b.-kcw+ sqrp4+2tgvbfor a resonant frequency of 1:wk lbg+qr3.4 -co9pgo2fztqk+ bs v 0000 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 placed0oup 87k( curp in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit i7(oc pk0u8r ups to be 1000 Hz?

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