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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 are units of magnetic *ts+s:c;qqlj -;g+5h 9oglrolb l i8rflux 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 t3tk k6tad- g:d xe/4fpj-ka5d hat 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 coilrhwa ah,+/c+x produces what kind of change on the i,hwx / +hc+aarnduced $emf$, 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 wirez1;m:o1x trflx0tg 9+0 aewlf produces what kind of change on the inducegxw l x9tr0;1+l:zet 10 foafmd $emf$, 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 nm mjlkm.)n/oz:;8 3ue:ggyn what kind of change on the induzu3gm yl;nnngej:m. ok) m8 :/ced $emf$, 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 magnefy*a)yb+ qkn:2e yc.0oym+o l/l0 qdgtic 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, 2y f -dqu;kgw4 iwnn.)the direction of an induced current in a conductor will be tha i.wkg f-undyn)42wq ;t which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i dc*u1t59 bm/ahwr8xpts center with i xpmu/tb*5dc19a whr8 ts north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magn+z-pzi +: jc1w1ab)-/abefpb bu cn3t et is held above its center with its north pole pointing down, and released. As it approaches thai/eca:-+ w+b3 fb1b 1 tjzbp -upzn)ce 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 rltoro aq m+7*y(l*;h region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,r 7tml;o(o aqyhl**+r 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 tb2u+ 7v -avkfthe magnetic field vector ab7vuk+2 vf- tpoints straight up. The magnetic field suddenly grows stronger. When 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 regiig2 5y*n0qb-o am jolm5x51xuon where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in tj2 qx bmx55au 1n *oilo5y0gm-his 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 tapmcxyr8-7 sj ,4urfr*4,m obxaw kfz+179pncble and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. xzyfu-1* km4fc ,nwb77 rasj cp48o9xrr,p+mWhen 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 throu,ljpm1h 9gazgcgr 42jr4nr 75gh a loop of wire with the north pole entering first. As the north pole enters the wirj,grap 247 nj rr 4lgc915hzmge, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is roi 5np t.w j94(iv:bnscpz-sz;tated 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 axis5jst w(4v9;.z nz:b nip-sipc of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angu :uycugaz-(v 9lar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, w - :vygacuu9z(hat 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.l,uv9 j2lxxh2wg*re y9* + rrb
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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 lzzz3d txk0wvk9 3m; 9an $emf$ 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. dom5g j0 kp r)ootq,+:The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the c z /+o2hmy2t kp)(g4di- byvneast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a h(m +v k)d-2n iopy/y4tbzcg2statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocieff:ri yu o3;xa iwik;h5253sty $\omega$ 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 trans;szw1 o.r oafbp x8:2yforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of 6zjc7nq6utn +49 xc,ii1xx uktxcnq 7t+1x6,c9ujn x4kzi iu 6he $emf$ 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 uv+2r..joqmo,/ 8 kmfnv:ujk 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 device thchv+ he 1)fe7-oihzpc.6q 5vnat

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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 cont)i bdze95;ox iains more loops than the primary coil tid)59ozixeb; hen 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 ceydb n1 jl28*9b 4tkjaontains more loops than the secondary coil then it ial28e4y9 db jnbtj1 *ks 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 -)d a(f iqmokrb v3w)6power 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 resonan; jw.ev o7mdo9t 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 induct2xawjpvm ;h q 609eqbfz)- z:zor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistorfp)q2ze 9xmbq6z:0 hvwjz-a; 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 inem j r- 21(yxpu5vob3q series to an ideal battery of constant terminal voltage. At the momentq 1v( ux2ymeb3 r-5pjo 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 R is connected togu;n vre n9 k,urn 5.p95 umx0dzc4ii; 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 i;(m5zg2:wsmfr 6tfm cnductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to -u cz82; f6ucxhin2 ;.(vzo, ut -fpub+ jcsrka battery. The time constant cz s6p2 bfj8ft , krh-(vn;zuc+u;i.2xou uc -for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected j6p8 gds :ou zz0hc*c/in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease 8 zg:/cudhczs*6 0opj 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 excqwgfh,c)nynd2;p+e . ept:

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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 circuitm 3r1 ernb7-ms+j01h hahpc3 r, 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 pokm 2i,; .-ql9+1 gdc 2gmyqzf dzw9ljewer supply. In this circuit, the curren;gf+l-.k m2,9y19 qiwlg 2dzqem cjzdt

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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 by what factor wh/2w ;at i2yp(dounxp8en the frequency is t iopnawt;(8u d p2yx/2ripled?

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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 acr7ey7s f qp17 x ebwm5skn,u3h+xuzr.7oss an inductor is doubled, the inductive reazy.x m3u+7f5r1e b7u w7ps7sx ekqhn,ctance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage /imoy o ze)yo*sf-9zb/ jq3 s6oj y61kacross an inductor approaches zero, the inductive reacta iyy y-6msof)3 /1kjz b*6j9qsoeoz/o nce 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 conne6 micy9,+ wlr ug jd/p/5uomtj880h t5zfbun5cted to an AC power supply. In this circuit, the currentfu ij5o 5yrj6/p85h tz,gd t/b cw9ulmu+0n m8

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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 civ 7jsbg7;jcv7 rcuit changes by what factor when the frequency is triv7bc gj7s;v7jpled?

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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 zer bexgxrrg;0w9o )vv5;o, the capacitive reactanex0w; brvv9) 5rg xog;ce of 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 between the voltages of the inductor a/we ezhwr0;k7 ik l2s2nd capacitor in a RLC series circuit/hkse2 wi le;02 z7kwr?

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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 idhqg/g61hno (+fuw o* s 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. The impedance of the circuit increases if R incre 8dcn 0sxwv2y4 j +cmj evj2yvo,v(sg7r +3e;lases. When is t2m ls ygjrvdv0c+cw4v yeev ,nx837o2+sjj( ;his statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedancev;f. / f*mfvon2hfau) 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 circuit4 yz9,.u0/n ;:efdhm ;bam:kxgdmisu . 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 double in an LRC spp bkrd*55 kzi42rqi7eries circuit, the resonant frequency of irk24rzb5p i 57dkp*qthat 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 bn5oy5jua 2729c amqw2bp9c b0r0edj( yy ts7ly an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs70n3/bzg;p w ta9kwgl 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 of h8y /5s 9y,fjp fubo3wgh.xc- 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magns-f8h u5ob ycwg39j /,fphx .yetic 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 uniform magnetic fiel;mmq.:isln-5 dk k9 xed of 0.20 T. Find the magnetic flux through the loop when the plane of the lx9kq:e knm i-dm.5ls; oop 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 magnnk f, d,s4to3petic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and o,k4 f3tdnps,the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from vl4j*+rm2auz $1.0 \; m^{2}$ 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 coilr q)urg4,t7 il 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 turndwui9t)w l+sg5hk j0 2s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plali2wj+ 5)gh w 90tkdusne of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 20duqi:awzqc4j9 d/c 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 )zy 9r46ocr tf$0.20 \; m^{2}$ 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 oftif; dc;c r7:b 60 m flies horizontally at a location where the downward component of thecc7d;rit:f; b 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 thatvp*1nntcz a rlca09-8m*q29 sj0 vt ym m*fw.s is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throughln-8s*tz9paw.ts m 2y 1f0m m *9jcv nrcv*aq0 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-sectional area kxd jv(- /dg 9cf:oe7lof $0.25 \; m^{2}$. 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 ofu7 9t mm61qygl 100 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 rectang n8zj(y(+daa iular 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 voltag(niyza aj(8+d e 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 wqe0gt 20c tkh)ire 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 si2xrvt f7zx-7ho, htd, mple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magneti7hxx,,odt-z7r2 v fthc field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a m*.+3m9d tv97lzwzyu3pw v5r x yyn6ai aximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on rp n/emg+gu/,7*qa ncv0gdb u;qw0t/ $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates o, zqr54ndnhjatk,8;h-cb ;kk h m2vf7: e)j yen 120 V AC, and when running at 5k2 eqkh847d)h -e yf,,mh:a bnt j;;rkczjvnfull 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 resistd3 jo6oaxdtsz 1fm+a-.k v,9eb v3/ beance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the st 3a/ b6 e.t3msax o-1ve+dvdjf bz9ko,art-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.*gmkld,o6b 4 /. eki z2q*dalt The operating current is 1.0 A at full speed. What is ,ak4 i/ 62*l. gltdbdeqoz*mk 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 poweose;-.q.; io tbrorhw8 e)8ef r supply. The operating current is 1.0 A at full speed. Wr r .h-)s ei 8.fbt;;woeeo8oqhat 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 primary volktwfan 79n7 a*tage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow s : -1plsvwtq+ 9v -u/yi)zivgin the secondary. How ma v-p+ 1ssl9v)zu:iwvqg/ity-ny 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 turnsz*0ps,eak*n2p m;+i*rkko*k f*gn sf are necessary in a 110-V primary if the 24-V secondary has 100 turnn*p*2kms*k *z+0s pngk; ri keoff*,a s?

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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 a 2000-turn secondary coiqu9*nfwdy4z)ucy 5uws : k,+al. If the current in the secondary is 3.0 A, what is the current in the primaryz, u4fya+:cn)d q9wu* sywuk 5?

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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 gp)/qi 9/aze ztransformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secon/gz)a iqepz/9dary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The 2m hl(hw ri:o-primary coil operates on 120 V. What does the primary draw im-(lrh :2how?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has2bmtn d 3udt5 9t-ith0 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primar 5d39bum2nihttt dt0-y, 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 primary coil and 300 turns on its se(vertjz)yjywm o/m* ee*u ;vj1h) g 9(condary coil. If 120 V at 2.0 A is applied to the primary, what current is*mjyv(o1(jyrj;9* eme)uz) vetg w / h 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 200 turns. g-;zmmy) q q+ z2zqxq0If the input q2mz0+m-gyz;) z xqq qcurrent 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 transformet*rkeuv-+,:wmq , z pzr has 100 turns and its secondary has 200 turns. If the input voltage to the pri:q*p m ,wk tvzze,ur+-mary 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 ,e oahdy:)n (auim a ps8q/j8/turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpu e8uha,o j(yis/m a/dna)q: p8t 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 voljmwfism2d7*uprxi. / 4 zr-q:tage is usually stepped up to 4500 V by a traw4r .* q/f7ir-zpmi2d smj ux:nsformer 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 or3z* ko)7 vqkzf current at 120 V. The voltage is usually stepped up to 4500 V by a tran)3ko zv 7z*qrksformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A y0kndk zz-4cg*d) p(yof current at 120 V. The voltage is usually stepped up to 4500 k 4d py zn*0(cz-)gydkV 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 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 0.60 W. A gen()y8: zmsfv liki7b dnv (xa,7erator 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 l,dvzn: k()(y xs77l 8ibfavimost 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 resist(,q;omvtxeqqr8(:i1vfs7k tance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission tto(iqxvek 81f q q:r(;s m7v,line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line *cf9 yef eg8qewa4;b- at 1000 V. How much less power would be lost if the powe fbaw-gq4f*;ye e e89cr were 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 440 V at 20 A. It is to be transmit11 h5qa i3t3 i:hhuhdmted on a line with resistance of iia h :mhqht3dh 5131u0.60 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 r /zz 2xi/m+/ yw42bnud:rjosA. How much energy is stored in the coil's magw:yx /md/b/rz4i2r2 usj+n oznetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor.jgl:4fh3- q5g14nmbe 2ebu e.ffks df- zdk69 What is this cirg1nk :-eqjf s2.b49fe4d3 u6l5megf df- hkbzcuit'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 circylng/y/mpzn/,2 w2zb tiih.6(3m eys uit 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 bgt5v0il5 sm /into 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 resista2 , spait 5trpztn4vlxl*h( 61z w3uv) 1ztva2nce of the lamp52(1htvti t 6pzzv2 3as4*rzwv t l)lnxupa,1 ?

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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 12tlpq g5l344pzmsuf; 1 0-V ac power supply. What is the peak current through the resiz5ql 14l34pgmu; tfpsstor?

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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 isf zfho 3a5v-4:l.kuy s the power dissipated in :fo .yv4-ka uhs5zlf3 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 50t:i; w.cu:*yl sg0blt-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 resistoglj9elj3 ym h:q.2z2ayw*1es r 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 a8du4hyjcwp04c : e l ucriz)yyg5l460 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor ay-1grc9 a vc) zgz11blt 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 reactancer ob6ju,.3wbjzh cb4- of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductivz;etao v882c he 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 indhn4v s k5cwlij9k,y02uctive 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 ,*qsu+ 9gdrjx n0 .ztm*un4su frequency of 20 kHz is applied to rxt0d u*u9, gn.+jssu *z4qmn 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 tl( d0xnl sjuu ek9y3tr+7z g 47cb:+euo 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 of a 4.n2tkud jdh j65, x,(yzvee*du1g :1jb 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 W of capacitive react9,osykrw -x8gvdgr; r ime066ance 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 capaci) g(ssq-yzo0x*md /aa mz-st2 tor 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 cal yzymgh0* :4y1xvv6 lpacitor be 100 W?ymlh y yv:06zgxvl4*1

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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 thre063agyz t mo9tzk :f9ough a 0.0010-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 circuit5yewks y e9c ;(ez)7;f/f- v(c6aymcbmedi6h with 12.0 W resistance, 15.0 W inductive reace6( e5;69 dy yycmf hf/cic7 zwes(vb ka);m-etance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impa zr9q*k0u+)5ep/ ligjm0ugc ofr3k) edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFru/+k j)o9z)f3* pu qc 0ag5i0gmke rl 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-mp6cf0l+o5je a F capacitor are connecal5f0oje 6+ cpted 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 connect;zujn: /r9ex rg9*rds cw 8p2led in series with a 20-mH inductor, what is the impedancezrrensj *dl gr: 9xwp/28u c9; 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 inductloiftho,3)e g.gt c- 3dv1au*or, what is the phase angle at 1000 Hzt.f*3gc)3ui o hvde -tgl1ao ,?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needets:qf f02.m*i bnhs2p ; tw1vld in a series circuit with a 20-mH coil and 1.0-mF capacitor for :;sb2fiwttnf vqh 0l sm1p* 2.a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with ahi8vz)wx z /9rxq*mv)5r 6 umt 100-W resistor and 15-mH coil to get a total impedance of 110 W athi6xz )q8)w/murxz m t 9vvr5* 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for ixj(yrrt 10 mj 4b0fk-a total impedance of 40000 W1jkix 0j4 t (fm-r0bry?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must yj9*wl7 ;bg+:nneyu3m 3kzqr r+q o5rbe put in series with a 100-kW resistor at 1.0-MHz for a totao3jn w9myu+q q3l*7r5byr ;:egnk+z rl 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 in series with a hz c)87plh /l:i5phdz 20-mF capacitor. What is the impedance azic zph /758dh:hp l)lt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz m so*c4u,n7 6q4sgn rofor a total impedance of 45 4nor s74u,6o* cq mgsnW?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phazrnpa7ar1 9 :t i4,sahse ang,apan 4 9h:tr7s ar1zile 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 seritq5 ep5nc( 7oces with a 30-W resistor at 1.0 kHz for a total iq cec(7o p55tnmpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with alm3h)c 2x2t, nr vrvh8 100-mF capacitor at 120 Hz. What is the phasem rt2rvlx3h vn)h28,c angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resisto-amzis 5yo fv r)i5p11r, 20-mH coil, and 1.0-mF capacitor are connected in se a poz5m-i1v1y s)if5rries?

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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 resisto /qyk1f1 k7o(zfef h57i, cieanvn7o*r, a 10.0-mF capacitor, 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 cirh1ov/oa57e ifn*7yki c7 (zfe ,nkq1fcuit?

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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 z0 rvk2lr /nf7rn.jkrpju pc;x2ffau/6 /7*qof capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?r pkl7 narkz6ff//xp uvjrr .7fq/j0*22unc;

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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 an ymw5tpy7u//m gle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect ym5m7 //wuypted 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 phase ehl)8pn7jy-v (d (lz dangle oe( 7hlp )dyz 8djnvl(-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 what frequenc3 hcy/2gbb67 uq 7opwhy should the circuit be driven in order top buq 7h/bc2ywh36go7 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 inwy,3,*yfqm 9j.tsj ep an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and ,peyjwy *f9js3, q.tm 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 circuibar2u: m7x-f8 wvw/pn4bb * o-at9xjxt 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 resistance oc td2 3 i7y 1j40y,-qvu)bnf dlel.sgtf 30 W. What is , 3i)lt udyds01b2clnyq 7gt e.4vf-j the 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 factowpr u. r2o3dy+r for a series RLC circuit containing a 50-W resistor, a 3r 2d+yrou.p w10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant fre :+coyyl8gqz36rk tx/z m- c+xz7jq/ zquency of a 1.0-mF capacitor and a 15-mH coil in series?xj+7 y-zl8o c/3tgq6z qmz/r kz +cx:y

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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 46e5t qnbece6p1d5 j/ms2w* ,arhhp 8l.7-mF capacitor for a resonant frequency of 1h,r1je/h2n6sc5 eeqp8 pdb t6l*wam50 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resoh8k v3 ioa)pqf6xz77 axj-c)inant frequenc3a6h pf ki7vjz a8xi-oxcq))7y of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and:uj w-jg 39*mshgymw- a 40-mH coil if the resonant freqsu g:wm-mjj9gy3h-*w uency of the circuit is to be 1000 Hz?

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