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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 are0, xdjy. eh.z,c op rf5dvo.;m 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 theefm r*;4kjf fdwz 3(buts12 4z $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on w-csv+*.,k r:6 fmc elmsj9 ebthe 6cs+k*r.- lfweej: 9c,mmsvbinduced $emf$, 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 through a loop of fzg(-4qv 7ic iwire produces what kind of change on(i-gvcqi fz4 7 the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chasp h q i32 q-ntb6u;s/fv zua*+ag8;vmnge on the inducep8;*zsf 2h a+m3nt/ vs 6 vbiqg;qu-uad $emf$, 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 magn:/q 4vs quc 2iitj),hwetic 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 w)6)np e hrwso3vl17 tlaw, the direction of an induced current in a conductor will be that which tends to produce which of the followi rw e)nw3op67s1) lhtvng 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 horizontal7-7oiv.tdaz) . d 1;ntdetyuk table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from ae7 .1vouayd;k -d) 7dtni.ttzbove)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet ismjero i4c4zrll 1,- 0f(l wqa3 held above its center with ilrm44l0 fo3j1czlw,ireq ( a-ts north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where tvl9nhx.5es k1he magnetic field vector points straight up. The magnetic51snv9 ekx.l h 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 magnedac9qt9r o28ctic field vector points straight up. The magnetic field suddenly grows stronger. When viewed r2 qd8o9cc9at 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 hh;jxrn 3)s7i j 0nr9lborizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced curn0r;3bj9rl 7xh isj) nrent 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 and8 zb ot8mi5:a:b5zc0-oaapxp carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. m58x-:oa b8aa t5: o0zzipcbp 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 wp)7bwhv 21dyzlf,rb (*egc0o ith the north pole entering first. As the north pole enters the wire, the(r,vcyh f o1 0b)d*e2wlbpg z7 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 at c 7y.zr i.so-s heqkj13onstant angular speed about an axis whose direction can be varied. In a region where a uhos1 .ksq7riy 3z-j.eniform 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 wiretlfen6l/kpbt)2*h o0 is rotated 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 of the loop's axis of rotation if the i/ o02lkltp*e tnf6 )bhnduced $emf$ 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.j(tkuqo-h4o*
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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 agf5-b5 /tiqqr; lqk e:n $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. T30 iycfu ftlz2 q8)a:v, 9vxlohe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved north9vq 2ankz83p c6 xne(xward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potecpk a 9x8nq3z vx(6n2ential 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 rotate)/h +qj 0sqovhs 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 transfoff rbm*0f,4dk rms

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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 revolutionb jjptmtw9+kan0s +.x3em 0n/s each second. The frequency of them+00kjn n/ s3t ep.tx+9jmwba $emf$ 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 dytwozl 75wpo25wlo. pc 3+kp -evice 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 dev5hzg6i, b sp*stt+h ) 8f;nfdsice 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 secondaru9ed8 (w2sj kpy coil contains more loops than the primary coil then (2 k dswupj98eit 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 1:qn wkoeo ;u)than the secondary coil then itn;o:o)1 e kquw 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 ip ,i33y 7rj:d wxmzqr(nput

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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 circrv4 thf( /m0z gmml*i3uit,

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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 idea,5qgo :u4psogh v18 rol battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrossv u 51 4o:o8osrg,hgpq the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of co+dew).xf- onhzc.b qa9h k5h6 nstant terminal voltage. At the moment contact he)5a+96hwnfd qzc .hk .xb-ois 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 R is connectedzml h(i1lnoe z 3m2tp+1s5lr4 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 conjjm w cx36 fus)5r4n-w2.ivkm nected 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 sel(2 rg .uu0zrjries to a battery. The time constant for the circuit re( g20zjuur.l rpresents 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 conngfg9 e+4tsll3 ected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time9 el3s4tgl+f g 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 -yjn7ak leos kpi(3* 6units 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 cio, xc5:-raxuw rcuit, 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 circuit, the *aw++,6 qj u xw9ojkaqcurrent+k j 6 +xu9wqjq,woa*a

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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 jr3* x 8gh z9q/vr 5n:q-loufoac circuit changes by what factor when the frequency isfzr qhq ou-*5jogn93rxl/v8: 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 inductor is doubl 8szssy hx4q4jznh7172v)eqqed, the inductive reactance of 742sq8h 174hsznx)jeszqyq v that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor afwgh9b4/ h c:f tk85:qrny( sdpproaches zero, the inductive reactance of that co8 b9(sqy dkrg 5ht f:/hnf:4cwil

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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 ciri1ch/cr ujx.r 5-wa5kcuit, the currenixja5 /w1r 5k hcruc-.t

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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 ac09i+3jl9 gxgfmp hsbg93j1hd9v en( n ac circuit changes by what factor when the frequency ix cl 3g1gj9jefhdsinm0vh p93bg9+(9 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 a5r0e bfh :9)+6dx.bnkub fk sapproaches zero, the capacitive reactance of that ca:9e s.hkx rafd b+5 k0nb6buf)pacitor

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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 angc,t: w1nvlp4g le between the voltages of the inductor and capacitor in a RLCn c: 4tl,pw1gv series 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 an RLC circuit is3-ufd( mzwzsp.5 zj *c:rd/y:hd:jk i 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. Tyf;ozb07216 apcf t-g d4 qxaxhe impedance of the circuit increases if R increases. When is this statx2 -ypazaxt7 q1fo;0 gd64fcb ement 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. T3sm2;afd /r fr xr2)i5xat gc/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 circuit. The impedan4l*vv(h r pwcd++9euprrn- k0 ce 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 double in an LRC n5w8fa/9bvl kug f4s3 series circuit, the resonant frequ suk3va5w8 n9lb4f/ gfency 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 r2swtn-,uub7xb4 +,ei ur5sic esonance,

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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 xpohtn.yz-n*n88b a-hm/,y a 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 isk5*pzkcnzb,:h2 v2j4ky *jr lm-ht 3x rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field2hx jkyj5zhbmt2kp, *-c:l43*kvnzr 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 ismj xn/()zg-z dmo8kn3 rotating in a uniform magnetic field of 0.20 T. Findz)3/(dn8g- nmmj oxkz the magnetic flux through the loop 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 rotatih , :frvmx9j2tng in a uniform magnetic field of 0.20 T. Find the magnetijmvf9h2 r,t:x c flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional arctr2tno an7s3 2p 3u3bvl*n n8rem4ztyj;2: rea 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 coil chan4xrvz,2 y5ejiv ;k(f 8oh3fhdges 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 bk hq, o0c:tm*wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thehmk oqtc*: 0,b field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire w++j1)ry3. dloic eljo ith 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 area 9rd7wafd czhgh* + 6f-$0.20 \; m^{2}$ 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 t(4(qwm8jzoq b he dow( o 4qqm8b(jzwnward component of the Earth'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 2.0n) 3gzx4 o12 mgru8zbw m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its 8u 2 zw4ogmgr3)x1znbends 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 v7di9 7wrtfynd9 /xc88sqlw; has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 21x3mzyfdgvc l;mj-4 3;dhio turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 rei rs4u,*eux 9du9f v7bctangular 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 a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of thi4 duvrfe7 *,9sbi9xuus 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 10/qe(7pwgwm16f ch xjpsv.a 0 :0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an v)gye4g3f x,a output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avai)af,g x yev43glable. 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 amzc 3wk3liw 2xgzh vo(+kz1, ( 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 resistancegji.*s6a 6sk,9 k5c svro9h(3pebrn h of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistanc4xin6x4is 8k70zaph,gy c2n de of 6.00 W. The motor operates on 120cnh sn447 g, y6pixzk2 80xaid V AC, and 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 r ;tl*zbfnti0.esistance 6.0 W is connected to a 24-V power supply. The operatf;ti 0bnz. *lting 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 c xk(hc- du9zr.47 tv xhc.e,nnonnected to a 24-V power supply. The operating cur. 79.xtcrnnd4xvhe(cz -,hku rent is 1.0 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 W is connected to a 24-V power supply. T4j.arepvcq ao98,q p9he operating current isqvj4.8p ocpaq 9a ,r9e 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to rz ox, n:xken3(educe 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 trm h3n:k5,tzhz g)p0vc ansformer causes 14 A to flow in the secondary. How many turns are in the seconm tk ,p)5vz: zhgn3c0hdary?

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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 ge zxv6 b;dm/0many turns are necessary in a 110-V primary if the 24-V secondary has 10 xgz/6ed mv;0b0 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 l5c 7t 5,n9o+i1jc pwy;z5v nnb u.drmprimary coil and a 2000-turn secondary coil. If the curctjdyon 5,zwn ;m 97ip5 c+u15rnvb.l rent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primagabbid3xfj,2 pah1wr 9c.1xr18 (e ih ry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the se (a1fr c,hbr18 i9ib1 x3j2ead h.wpxgcondary?

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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 pro gw89l ipe y.q9gp;-di8z t(ekvides 7500 V at 10.0 mA. The primary coil operateqkge gil9-(y pp8 z.d;9ite8w s 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 teu.3yynwl jqyh* :op,eiz5 6 4urns on its secondary coil. If 120 V auo,yyhp6 ewz:y jn* iqe35. l4t 2.0 A is applied 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 turns on its primekmn)pbg i9r2ru-y y *zanmy8+-97eg ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prima gn+m )gry-u8pz-r2e* byie9may9 n 7kry, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 5i x r00pv8znh200 turns. If the input current at the primary is 100 A, we can expect the output current at thep85n0xv0z rih 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 tu /vqdehz:40pvrns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of t d zve4:0qv/phhe 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 secondary has 200 tu 3tp cwsj gejzt;al.;:px966 trns. If the power input to the primary is 100 W, we can expect the power outjpw6jtc; tta.zgl; sp:93x6eput 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 voltwop82 kmzfxx,lar*(4usx x 00age is usually stepped up to 4500 V wm0a4x,zx0 fs8 rx2*kou(px l by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 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. bbio6*sosm x-n9dtoa5nc*cn( 8 n:o, The voltage is usually stepped up to 4500 V by a transformer and transo :m -t*b*bc o8 s6d(ao,in9s5n oncnxmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vol1 oo6zny) 1cg w-ps6bytage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not steppnwocyzgs yb166) p-o1ed 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 ofr)8 7 mfca 3*wwt.8vaarbq)yk 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 transformer were not use t*8 a)krwra8)fqa3y.vw7cbmd?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission linevbml1 9.txn*t 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.9vtlmx*tn 1b original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wou*d*+buc5i/memvpv v w-m pe f4*uh/70jkk fl9ld be lost if the power were transmitted at 3000 V j 5 -u *7v *0*/kb4vwpecupidmmmhv/lf9efk+ 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 on aff1 3dz*c:ue f line with resfz*1 3c e:duffistance 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 stored in therrn 1(/ b 0ggru ,d;qnqyl.+gu coilyrg qr.dn bg1q r/ n;u(glu+,0'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 contain1 6lty/ts xnpb*qh k/;s a 6.0-W resistor and an 18-H inductor. What is this circuit's t stp/b/xqn61l;yh tk *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 voltage in an AC circuit where the rms voltao+b/( o d ;tnng*3bxqsge 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 intovhbey i9 /u)t2 a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the lxpwwq;4h1x.xl,7m vf amp? ;x wlxx 74.h1fq,pwmv

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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 conn;jkogzf*pd rt-;t:p.fw64d oected to a 120-V ac power supply. What is the peak curre pr*p;:o;4tzd d.k wf6-f gjotnt through 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 the powe/smse4 w*v-8v qx2l1 fml uy,zr dissipated in the rw ux8flv z2my/e-q4s*1vl , msesistor?

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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 res s:n ibohah2;t 4 7omz6f9o9hn5sa4jnistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor .57 ocngb657 h ix kxfii-dv72u, jipk)j3g xtis $I = 0.80 \sin (240 t)$. 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 resistfyjz7+y1bpo )7 gy 5wdor 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.+oisr x++qp5 u0-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 s7 5e n x(iir6zka6+*.jc rwzva 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 ;hmn39 svxc, ja 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 necessary for 157 W of inductive reactcdfnbd-u hqx.a4.m ) h,chj3.ance 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-m;0ex:tcd /v-f3jkdnr H inductor when 120 V AC at a frequency of 20 kHz is applivd dn3/ket0f- ;cxjr:ed to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz souq.6o y)aoe4v u3jdll2rce?

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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 capac- . tgj-o,akjditor 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 oitt4)y lz1hl96vtg :q1 rh3l50 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-mF capacitor have a reactance of 1200 W)n 3gjmkj d/ 1gw*inu.?

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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 capacitivu)lmbzp)jtzu8l 08 9vlta 1w:e reactance of a 0.010-mF capacitor be 100 W?)zlta1lut88)mlv0w: p u 9bz j

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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 0.0ors,xqo,;pb , +ju:iy; g7 zh3;mlyrm010-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 ax jwt:0sf;j+12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac w+ f:jjxs;at0itive 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 r1 0ll7xc/btszesistor, 20-mH coil, and 1.0-mF capacitor are connected in ser0x/s t 7cb1lzlies?

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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 0b 8fj(f,bc;ck*c cej1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacibk(8*b 0fcjc, c ecfj;tor 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 th pc3c9k up+y()d rg7vme iu93 yvp+c7) c(gkdpr mmpedance 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 rqy71t cx+1bo inductor, what is the phase angle at 1000 x71y o+b1 qrctHz?

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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 ap2u (duws 9 k0lr2z*y2x *uwwynd 1.0-mF capacitor for a total im2y*w(2 9dlprys2*ukz ww uux0 pedance 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 /y68))ewcxln 2(dkb,ogsue w series with a 100-W resistor and 15-mH coil to get a total impedance of 1w wbkeysoxdle(2/)u8 ,) 6ngc10 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 pu- . 9ercnreet.t in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W- r.en9e tcer.?

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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 1.0-MHz for amk5;j(3o uizf total impedance of 150koi ;mz5jfu3( 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 co,71 .h(ag tqgmwbfho-nnected in series with a 20-mF capacitor. What is the impedance t- qh1 mfo(b w.ghg7a,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/sgx ;2d /udy)ssn,9epf wh4o -mF capacitor at 1.0 kHz for a total impedance of 45 fhd 9;/ s2 ogxns/4)se,duywpW?

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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-mF2 0f7tsz+hdw x qgw imqy-.;a8 capacitor at 1.0 kHz for a phase angle of 8i2f0hwgsq;mz7+tdx w y a q-.$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0h,d )v7nts6zl fi9s s0 kHz for a total impedance of 45 Wtz,ln sh9if70d6s) s v?

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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 th shmao/c3-+,t2u9(eepduc tx e phase angle?uc /3shpmc(,a+etx9 ut e d-2o

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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-v a(mwv v0ut2 n(y5wv Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacv 2mn(awv(uvy0w-t5 v itor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF ioc ;72dp3sbtrqbn ds39p2 a1 capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz oq2 srdi p7nc9b12pba33sd;tpower 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, ax 1 ; zs,dos9ti8fljr7 capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to 7dz;t s1i xjosr98,fl 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 3 0 e(odr5y6jyts4x4vj 6bfkeRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplej 5s04 6obxf y63dke( r4jtvyy?

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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 selt0pwdh2cre 7 tg+v13ge x -r8ries with a 500-W resistor for a phase angle of3- v7 h ewtp8tre+x2grl 01dcg $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what -nhl4xfgkbl)abl/x h: a d 5*4frequency should the circuit be driven in order to have maximum power transferred from the driaxbgf a:) dn x4h5h-kl/ll*4bving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistante.8a fpr** :6dhy l3 o0cpydtce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is colt8c:y3d 0a h.6ft p**poerd ynnected 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 6l k:dpn/qb w/kzh8-tis $63^{\circ}$. 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 of4ypi .(t (7u byqkrinx*-tfy*b od18v 30 W. What is the power ffd(ubtx- .bn y piy(rkv81t *y7oq4*iactor?

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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 ciryq.yxa1d 1ro;3i( fvg7mz:segjt(( t cuit containing a 50-W resistor, a 10-mF capetiy 1j:rqv g1 3(d( osz(7g.xtayfm;acitor, 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 resonantv**sph:tfha o qa (4g6 frequency of a 1.0-mF capacitor and a 15-mH coil in series?*6p 4vafqga*h(h o: ts

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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 cl-y9mc991g eagyva v.apacitor for a resonant freque c-mvavg ay99 g19.ylency 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 induct /hyb h28zabk6or for a resonant frequeb6y 8/hak2zhbncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be pqj 2cd14av6bf-fj dp-laced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of th6d41 avfcf- bpj djq-2e circuit is to be 1000 Hz?

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