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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 magnxji0a fu m 5nfg);4 + snj.f3jvu;oex7etic 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 inductio6xy* rvlwq3i+j:+j3h8 z2f(wmlnwh yn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil p zo6n70nyivy 7cz13gproduces what kind of change on the inducedizcz n3pyg7 6v7 01yno $emf$, 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 wire produukns+j o(eh 3vc ir3df do,pp4/haa -;3.sby ;ces what kind of change on the hon3p(+jhdycuk,av ;o3- /bfad; 3 si. s4eprinduced $emf$, 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 chan82pm sm:+ -co mjey3nrge on the induced mno- jsrce82 y+3p:m m$emf$, 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 magnetig,v3iet + pvkt3y;mb3c 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 o5n*ol hyx+e2 kf an induced current in a conductor will be that which+ y2no5*ek hxl 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 horizo1c/o(1wfkf i mntal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet 1m fo(1icwf k/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 38z0b c-gvxtzbar magnet is held above its center with its north pole pointing down, acgz0bz 8tx-3vnd 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 magnetic field v-8ozpb3rh rs9 ector points st-b8 r93 hrpzsoraight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region whe ry;6ffp* g6we,3ioshre the magnetic field vector points straight up. The magnetic field fige w r63osy, *pf6;hsuddenly 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 region where the magna;xm76 sntps8su;n 4detic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disn4;pu6 x tamn 7sd8ss;appears?

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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-increavb; o,yxb8.,.d adwjcsing current northward. Two coils of wire lie flat on the table, one on eiw;a 8b,bcj.ydv,x od. ther side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loo+yc)i 3lm-clq p of wire with the north pole entering first. As the north pole enters the wire, 3c )mlqcl -+iythe 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 constant angula+ong2bv5 gn1 wa3r rmb*g 2yz.r speed about an axis whose direction can be varied. In a region where a uniform magnetic fr wgm+5 *bogy1 22a 3nbzvrn.gield 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 rotateg r4: 31 /bhwgnt;vgbhd 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 t1:4trn 3hbvgbg;wh/ ghe 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.csni1l (b5jd. v4yi5c qbre ;8dcm8o9
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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 tha3i zo ;bne bsy8:,8qcxt 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 magnetic fieldf2y pirmt--ii brn6 0.axge 98. 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 east-west direction) is moved ns *8v8vihk8dke6hv4 k orthward at constant velocity through a magnetic field that points straight down. Make a*6hiek8d8h kvv48 ksv statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at mevx wmi+c9a;dr f8u0;jm:7d, cx0i) 3 urcyga 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 transformovyyq((m;g * cs

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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 th7pu 32a y j+uanxb4-ihrough 60 revolutions each second. The frequency of the+a j3xau2b y4ipnh7u - $emf$ 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 used vx i/+m ,zmij*.gwc z f1wo*g;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 de 5b1h4 fc +mv4lfyprv)vice 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 sv5hp1l;csnw v y h9ib;2: ,kkwecondary coil contains more loops than the primary coil the; c:kkyv;b2,pv 5ilhwn91 swhn 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 pri3i j v-gmxa1-9 ljkse:mary coil contains more loops than the secondary coil:1 9je -gvak3msl j-xi then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpuj. e-+ hrsz p66m:fgujt

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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 circuit+f0p+ x9 go,x0lar 3nvg6gznoec( j :s,

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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 inductd4yd vha7 :.xb9bb0lm or are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thex7.0b9 ma y4d dl:bhvb voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of 4h99jmr lxw z0constant 4hjw9l rmz0 9xterminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit witgw8p o:tzz d :5nl;:x .jd1rlgh inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 + va0cm;b)h31 xgkxnjis 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 a battery. The time con w16tc:im, y: hnh1p h0bxlf4i8cvnh) stant for the circuit represents the time required for the current to xb 8vhnp 0:t4hw:l n61,1yh ccim)fih 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 a f6 p/kae+0cinre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit n/ 06cf eiakp+represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following haf-iejv 5,7 cdpeu3nevaz8y s3( ;7rrove the same units 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 ttxu, ens4;m4y61lxa s his circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected tinn . b1 ghl:n6(urz.to an AC power supply. In this circuit, the currennl 1grn 6..th(z bu:int

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactan 7xz)9qg ro sp st24aehia;91rce in an ac circuit changes by what factor when the frequency is q94rzts;s)ho1 ap gix 9e 2ra7tripled?

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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 inductix, h;:jaq si(jve reactance i sq( :j,;hjxaof 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 -vk +h-j4lubyvoltage across an inductor approaches zero, the inductive reactance of that co4+l--uv bh ykjil

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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 thl2tk 0mi spt71fj.;pfis circuit, the currenttfp1p7f.il ;20 tmskj

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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 frrfusto b+y (k:7ho+z7 equency is tripl ++oksu7:rz( thb7fo yed?

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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 zero,b*coee*t r52udh gr32 the capacitive reactance of that capadre2 2u g3to*re5h *cbcitor

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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 g0..mojd(o w .s:8gbsy vwd8gvoltages of the inductor and capacitor in a RLg..g:vdmow (o0 88bs w g.yjdsC 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 u qxp/0x x9)9a v nqa1iv1i6zrcircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The imh )wf,j f+h; hyt,iv1ipedance of the circuit increases if R increases. When it,+hhvw)j; iy,hif 1 fs this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circug1j2kt*7xu ,n z7c lkzit 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 impe0l7n5rbv6z yijz(-kd-ki4 k wdance 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 an ) bw2*jd3yeumd the capacitance both double in an LRC series circuit, the resonant frequency of that circumd3j *b u2e)ywit 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 circvc dk mvl31qohw-- b**uit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLcifxf6e zu;0/C 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 rad:w +qlx-okj/aius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the-qoj:k ax/l w+ loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetv.x cid;s*l5h3cyhq 3ic field of 0.20 T. Find thv3 ;c q ih5*syhx.3ldce 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 rotating in a uniform )+hrjeayoe ux)76h/+7j hpc w magnetic field of 0.20 T. Find the magnetic flux through the lo+c ex pw7y6)7j)+a/hheh rjouop 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 adjustable i zdy(d6 x3do* 5m1gabsingle 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 t rvt*; d/rlg cxzs8(5u j.1jpchanges 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 fr/gfif3).u.;ee l aq mmame with sides 18 cm. A uniform magnetic field imfm . l)/aegef .;3qius 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 average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area ojg7a 2d.4 d38b-yz j./doh bw)u4pusggeq-vof $0.40 \; m^{2}$ 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 area4r9 ab)achzj ,o4s/xk $0.20 \; m^{2}$ 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 hon*a8*xv2 lx ve, xxvl.rizontally at a location where the downward component of the Earth's magnetic field isxxxevlx v l8.n**2 ,av $6.0 \times 10^{-5} \; T$. 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 thatq5z*) y9ix ,0-y hwyp7ggbtt k 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 7xbk ty9 p-igyq)h,y zgt50*wagnetic 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 jq-x ir 5hu6mwr+ik; yq2 ;d7x$0.25 \; m^{2}$. 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 gp m:jvg kanet+ y -+vml114suzn, p2+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 rectangular loops on its armature. Each loop is 12 cmu nni(qmpqz3;c (.-p e long and 8 cm wide. The armature rotates at 1200 rpm abon-pq.(cenm q3zu i; (put 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 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 o 7 p*w*v;todcjf 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 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 construcnz -8fsx+ 5ilnky3 2wct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of thenc ny+-s2kwzl85x 3i f 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 +y 1 7i8zq2mbcf.2mhd.q)ko ytumi2lmaximum $emf$ 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 gh 5 3nh7e-mmxpen/5lz4, cdn 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 resistance of 6nhcj.o 3iohbj4);.yabm fk8* .00 W. The motor operates on 120 V AC, b 8;hjoy b3oc). *anjmifk4 h.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 resistance 6.0 W is connected to a 24-V power supply. Th5 :c*fgr g:g xpgev2z;e operating current is 1.0 A. What is the start-up currentgfvgge:;rp2*z5 c x :g?

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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 suk+a qu0p7 y +s25eicxzpply. The operatinzc27 0pui yxsk +eqa+5g current 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. Thfo1tot+yd v 04ge,.xj e operating current t.+fo xeg ,o4tv0jdy1is 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 transform e8zsb:cb z8y0wx,)zsq/ er;mer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seconkeh(lg18axvs 0c 97rbdary. How many turns e1bg0hcavkx rs9(l87are 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 5ivm:qth h/ x)in a 110-V primary if the 24-V secondary has 100 turns? vh/mt5i: hx)q

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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 coy oygp7,ec3 c.il. If the current in the secondary is 3.0 A, whatg3 yop.cy e7c, 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 p9upyk;+we w 6.k nv ;j./oy :+me 25okvapdjbwrimary of a transformer. Assuming 100% efficiency, how many amps at 24 V cao ja ykme.jk +/d:ow 2n5u+6p.ev;9w yw ;vbpkn 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 provideshhs +q1xrp2q-x /pivi6xsz05 7500 V at 10.0 mA. The primary coil opera5hq qs21/x0s piizxvx p 6r+h-tes 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 turns on it t*7iuuwpzb1 ;s secondary coil. If 120 ;ub*zu tw71pi V at 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 primary coil and 300 turns on its zx zr uy38qazwlv,scxb 143, 4secondary coil. If 120 b8uc 4 l rzxwys z3q4,x1a3z,vV at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transaqgbe.ivkby qh**61/nm :.qhformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seciqhb h1 / .ag*q :veykqbm.6*nondary 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 seconyg9 ek2:i9)g,dflq eydary has 200 turns. If the input voltage to eg9f g :l)edi ,2k9yyqthe primary 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 secondary has 200 turns. z:25mg:rgrn 9vx nv8z If the power input to 9r 8vrmx5zg ::v2z gnnthe primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of hdpvq8 u/u 1pq1zplvus:i ;,5 current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throud1pvsq vi1 zpu8 ;:,phu/q5 lugh a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuwczj,kcotf(6q)*lb( )6p ddl1sl c 5aally stepped up to 4500 V by a transformer a6)*j5) sldctbq( acfw(c1,d kl plzo6nd 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 of current at 120 V. The voltage is usuallyxnn9(f yun,v,qa pv(1ak)f. w 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 thn) ,nywfq. x,( akpv(19aunfve 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.v4ux-8v bpfh ffnbyv8f)r;//60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentag-b4/ )fv8rf vn8hfv/ ;pbfyx ue 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 line 50 km long has a total6(,f *j,qql o1 ogeewssq71wxcaf 8k4 resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to hea a ,*8xw7ff , 1sk6oeqqqjwls(gc1 4oeting of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the 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 hfgq4;chl,qw1 h3gdw, te00 d yq9b:s. eomu (down a 6-W line at 1000 V. How much less power would be lost ifeq1h tgd (ww ,dg :se9;,hfbuly.3mqoc q400h the power 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 transmittet*ylcl7 ) hhieh 32hg)d on a line with resistance of 0.60 W. T yilc3hg 2 lh7))the*ho 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 indm:n5sztt3 82 hlxs 3x the coil's magnetic field2xns 3dzlx8h:3t t m5s?

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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 ind+ uq.hia0*nvjg d43icuctor. What is this circuit's time cdqgcn+a3 i4j hv0i*u.onstant?

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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 voltage 0 8tf/:fpmbsc 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 thev578vthe ;a x e*feinc3uv6 3i 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 resismh xm+m1rsfogdjq+-1e (dx (,tance of the lamp? fr+ gq(+ms, o1xx -ddhj(emm1

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power myd8*:a *dynqsupply. What is the peak current thddn*8 yy*aqm :rough 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. ip0+k:u xumo*q4/ssj What is the power dissipated in th xqu4ssip0k :*om uj+/e 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 v1:x nrgvx;q /a 50-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 resi5my9yiki2qopp8i e:sz4; /b hstor 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 50oibn*j 6o7(bi-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 at 6th .ptv/rt th s5g/2+s0 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 coil :hk tez x(uw5*- jdnx6at 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 coilovco*4,e * lgt 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 reactance at 1000 Hzipio zc7s,)qkm 082ms ?

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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 inductot6py( s bgqb,2r when 120 V AC at a frequency of 20 kHz is applied to bgy ,2t6b( sqpit?

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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 coio+4w a2ry, ixkl 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 of a 4.7-mF capacitor at f)+h3;6fxzld/w w0,rk c ,tj fxnx3tv 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 hto y50jf7mp 5qq)l su.i7u(orave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactanccy9jk. dz- as/sm-k1)t*uw-e bt nrr3e 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 cayfzjyd- b e5roa-z 029pacitive reactance of a 0.010-mF capacitor be 100 Wz dj9bo5zey- -ya0 2rf?

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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-fv jo(fr9 ne4 :(cpz;;lgkrn.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 circuit with 12.0 W wm o (p 2d6tsm2o- a37t8qvkku84x azpresistance, 15.0 W inductive reacm32mk p-q8oas2 8d k(7o6ptzx tavu 4wtance, 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 impedance at 1500 Hz if a 100-W resis8xeuok vo* 4vcdu0 e+*tor, 20-mH coil, and 1.0-m vd*e xu k84o+*0vuoecF 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 Hzj1kx1g p0ekru; m)ajcy/w ),q if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ika; 1x/w )1ck r qyj)eg0m,pujn series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the i;()pc:lm ;4 ug fxvmbompu fl pgm;cbv4(x:)o;medance 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 seri7gfhr7( 5d7mv+ddi cf es with a 20-mH inductor, what is the phase angle at 10 d5d77fi+ vmr7hc(f gd00 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a se--q3 fb.xrjig ries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance.g--3 i jxbqrf 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 capaci/m9+t6c, 5v a6x dxdrwuompk7tances is needed in series with a 100-W resistor and 15-mH/mdv5ct pox,79ua6kd 6mw+rx coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for aa/rb o01j3x ql total impedance of 40000 W?j0a3o xb qr1/l

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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. eswa:e+ n;g,w0-MHz for a total i: se;w+nw,e gampedance 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 seri. (ntt, 12rt o,eh0f3yg dhyn o1qrh1aes with a 20-mF capacitor. What is the impedance at 1000yh 1,,no a h1rgo2tt.3(eyrnth0fdq 1 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 sc2vb. q4*tl0f k3p+wsstdx- neries with a 10-mF capacitor at 1.0 kHz for a tota+ l2pds4 vtq. bxw3 tsn0*k-cfl impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF /osvdl c,)u( xcapacitor at 1.0 kHz for a phase angle( o xd)/lvu,sc of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at s ll rtmkojlboufs/c l 85 8d3q6,.67z1.0 kHz for a total impedancol3dlrjub mskc l85 sq76/,t fzo 68l.e of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a lh.ma qmj75il8+.*wbei a b,e100-mF capacitor at 120 Hz. What is the phasebb .8m mlhel.a,qe *iwi5 j7a+ 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 resistor, 20-mH jds z:h(o+xu. coil, and 1.0-mF capacitor are connected in sezjuxs+h( .o:dries?

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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 capaa7u1a o.hg g(x; 6nwj7iqzr0wcitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powe 6xh;(un7rwgzi.j01 ag qw7ao r supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive r5p7i ,hp ep +q06* lvyih vouk7m8+bireactance 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 5mvyipqhkp ib+h0u+i, v6r7oe *8p l7circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contai 4wxbmwgw 6iwy:ox3; 8ning a 50-W resistor, a 10-mF capacitor, any;im6b 4 wwxwx 8wg3:od a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in serie/na7 8reknf6wjg1 b i/s with a 500-W resistor for a phase angle ofr kbf 6a7e nnj/i81wg/ $40^{\circ}$ 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 W8a- oihtn bs14, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sour8a- sbni4t1hoce?

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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 resistance, 15q/kjz- fa5y -o78 gvxv.0 W zvf5k 8 v7y /jaqxg-o-inductive reactance, 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 ,+ika2n bbw gp16ud i*AC circuit 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 impedancek8x ycn*vxp- ; of 60 W and a resistance of 30 W. What is the p n8c*-x;ky pvxower 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 c8 dzkv bonwu03+v,8.b7f ptt circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power0tbpt nk. bd 3cuz,v8+ofv7 8w supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coihw3opco 1 +iaol56e v1l in series?a evo5 plo ih+o11cw63

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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 sgph(y6 bjin7t607vl i y:*miwith a 4.7-mF capacitor for a resonant frequency oi bpijghi6(ml *7:6n0yvys7 tf 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resona37bdkz szf6s9 m, qzn tu(.ye(nt frequency of 1000 ufsdy7e 3(6 zk, 9tszzqbn(.m 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 a 40- gjv1 k0o:ks4k8(pf xoh85ffhmH coil if the resonant fref(xks8o k10f 8 vjk:p4 5ofghhquency of the circuit is to be 1000 Hz?

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