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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 unitspopb ):gx-gb8 qi./j j 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 fjsp5m;o1 ;u4 dbg c2.xq o*clthat 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 produces what kind of chang)3kvx/ + puitje on the induce)u+ 3tj xvkp/id $emf$, 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 pro-jvaek20j0+ .7l bvjzay1ck qduces what kind of change on the induced k.0q +avab 7c0zk2j-jlj ey v1$emf$, 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 wvcftqyt 5;2erv.j,jdg5+ lg9 hat kind of change on the induced vv5+g5,dj t; grqf9jc.l2e ty $emf$, 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 magcpwz i63v( z9mnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of a l/whq/krhl76 n induced current in a conductor will be that which tends to produce whicw 6r/lh/h 7qklh 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 0q;u zw i9+z.lhjdch628rb bkgthw(;held above its center with itq 6j;i;d.hh 8zhb(ub 0wr9cgwzlk2+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 .p8o: syn 6y*6mpxl9 6eu cfdehorizontal table. A bar magnet is held above its center with its north pole p *pp6.lne9 e:s6o8d6xmyy ucfointing 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 the magnetic fiel6,9xjc)x) .jitxehr8 ht vg: ad vector points straight up. The magnetic field vanishes suddenly. When viewed from .)xx,e9txti6c:g h)vhrjja8 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 t h4*t; 42nqu+ ych efcnx+l)0u+2rjgr6w swk zop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ocnhjls y46zunr2*)g42r +wk;c0x t+w+ qfu he f 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(j* g)wl;,is4nfs9aqfk9 d el the magnetic 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 disfwqse*n,94 lgfj 9 d;(ka) islappears?

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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 argub:gvw1en 3a 5)n78ex ,fpc horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from n5b7,urg3cgea evnf xw 8p: 1)above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north po3he/uh)gyt (q le entering first. As the north pole enters the wire, the induced current will be (as viewed fromhh 3/u( eq)gty 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 ro5 iyexy,w) y2qtated 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 induce5, qxywy)i2e yd $emf$ 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 angular7v 53ko:s :pna ppt:eo 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 o :np3okvsp:ao :e75t pf 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.c7cm ze 63q3ums8elt*:x z g6rw*lk;m
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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 t-kxv* 3qq+ps2z/5frvqtt0x re .y: d yhat 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 zcy*:hj6o;ok i(f**ln qlkq : me ;m(ymagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in tdi:mu;cq+ oq o (ho93lh)3rs; +apvou he east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a ; +3:;hhqcv3qooios(r m9apou lu +d)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 ba9 2 w*o9jvgjdpr rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorvjoc8 3t,l;v49h;brd+yc kb1 l c ,rs8bxqsc7 transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each s4oa0x*ls-ijz z(z6tmo9dtm 1econd. The frequency of thesxitm*olmz-zo 9a j6( t14z0 d $emf$ 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 22-ky h +ip) n9gm0 q v4ybxhn 1n/xl1-wlxzzoto

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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 t-wmbdx:r-m m1 hat

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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 s,*(q yt jwwh7oecondary coil contains more loops than the primary coil then o q(,*wy7jthw it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops thk6qpfyx -z )v-m y,c5han the secondary coil then it ih6yx,c-yq mfk5p-)zv s 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 inpum;fft+9 6 slwit

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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 resona0v5b8ix1c5tlw 7r4(ydd(urmx t l h/dnt 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 inductor are connecteww2:,uzk;b; s9/ y9 dnfxfhpqd in series to an ideal battery of constant terminal voltage. At the moment contact is made withuhf 9skb p,dn:; 2w9;z wyxfq/ the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal.1r7fbuya1fmzf l jn kh )7;5j battery of constant terminal voltage. At the moment cont7f1 )njlzhjur57f;1k.fb y m aact 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 indua5x.1 h ;dnvq8y c5 z xjtqr*-ssx(c.cctance 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 is coro;ce h+7et+b6kgpqa /v dt .:nnected 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 co 59)fktryj hgda8k6:pnnected in series to a battery. The time constant for the circuitjr8ht 5d) yfa6k:gk9p represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a u9r4 e2 aci5wvbattery. The battery is suddenly removed from the circuit. The twr5uiae4 v c92ime constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following hj9q)6jg 0 l8tm6d4kxukd0 dkhave 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 th-+ioa6cz 5gj -zp,np pis circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to tm-r8vr.m 8bzan AC power supply. In this circuit, the currenzm.88 - mtvbrrt

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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 when the freq+qus;8:1udo(ti /i) fzg) zjrorz z wj)/ue:vuency is tridi1rjv toz:/w)gu(fs/8ru )j: z uz+e)zoi ;qpled?

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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, th :ai1h yc gd;,am)xjuq3i g .qwr)0fp5e inductive reactance of that iif1,aagx5jqc3.) :yrh)idw um0 gqp;nductor

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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 approaches zero, the +dbx8 l1 mtoa 2.gh:t3tq l5zkinductive reactancbh1m .qtlo3dtt:8xg+l2 5 za ke of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC p vor2j(93oa dw:ods d;ower supply. In this circuit, the currenj rodw:od( 2o93; sdvat

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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 wyoban54btv i 3h (v-wln* )m9 9tv,ymmhat factor when the frequency is tritmm9hvyyab9wn ),tl35 vmvo -(*bi4npled?

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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 capifisp/:/ lp)b acitor approaches zero, the capacitive reactance of that capali)p/bi:p fs/ citor

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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 the9rcn 0am6,z(hj) 7yhg 4a ther inductor and capacitor in a RLC series circuit,7 )rnr9g4 ach thy6hm a(ze0j?

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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 au .lref+b(6-hqf :mr circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance o.bsil9sy em+qs7oksv e5j07 5w. w.gzf the circuit increases if R increases. When is this statement5s isqsbgo .zm7. e kyv w7.+lew95j0s 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 impix i6 +gi:*4 : si:+ocxctmejiedance 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 circu;t,7 tsq /(lxnkqv2t8i0rb sjit. 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 a)f)30b4k t,wqq sj docapacitance both double in an LRC series circuit, the resonan 4)atqdwfkq3s0oj )b,t frequency 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 resoosgp9; 6ps +fenance,

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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 8 k,sin f1:ahsoccurs 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 magnetxou89ppn2o9v/f psks v w2u9- ic field of 0.20 T. Findpk2ovsp9 8xp99fsn2/u uw -vo the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2d yseigy(98gr6zb i.+0 T. Find the magnetic e9(+ry8g6bz sig.yid 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 ig jeqh1e7 lu4dw1.y)7 -li 8 7teybxsqn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an as1xq1u.eby 8eet )7q -yd4w7igl l hj7ngle 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 loo)9g 3v5n6nmd4:hn zr,unukm ,h;fkjg p 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 change 4i 3p1/ tu/nwojmotrv uux5d*.u eq(*s 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 sq95bfcsm1dm;8n 6fch v cw62e fasko39 uare frame with sides 18 cm. A uniform masm h2me9 6fc k3w9v1n b8 a65fdcof;csgnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the 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 wir6er3/ ujs rgf.e with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns an t01imt.g7tg 34c ggcyd area $0.20 \; m^{2}$ 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 j6c 5efrj)qw8ma2pk+3/l uc c span of 60 m flies horizontally at a location where the downward componenfjecuj) k3l + 6cq2prm5aw/c8t 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 2.0 m long rotates at a constant angular veloci/hh l-hhy -sljz ;i:1kty of 2.0 rad/s about a vertical axis through one of its ends while in a constant m;-: izkl-1y hhlhj/ shagnetic 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 chi(q2b e 1/ii1xz(nfa:wm/i l- sr i+of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arxtnees(ar s 11.vw3;cea $0.090 \; m^{2}$ 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 arm71y;oh /pfmhatw j9/yature. 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 iny ;y 7wht/m1p/hjf9o a a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns +nbed,qg .x,3pr 5owf 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 e -dr+ljox/ ixlx (l.*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.x/ l*+d.ijxrx-( leol 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 5ro q7fx 8bghj)vm q:*a 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 resistance ofzz q8o4-57qt 0 bdpv4mhbxmq; 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 resistancelf() os8 ppvm:rng3hu/2 p t)k of 6.00 W. The motor operates on 120 V AC, and when running atsp)ut)mpf8krplhg/: on 32( v 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 connecterh- i to7brsg1x+(f3ud to a 24-V power supply. The operating c+1rhigtfoub (x- s7r3 urrent 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 resis vr:c/ vc2v2 u0xpkr3atance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac v2paxk c/v0cr: 32ruvk $emf$ 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 su,j4u gj3z)ha5ub2 af84jnw43s w sewi5 cwzm 8pply. The opeza44un szwwub g8 ,2)a5 45jwj3icms8fw je3hrating current is 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 reduce a primaav,e* we0mu u3ry 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 1id5ksa 5)k nz4*fteild, q 9mprimary of a transformer causes 14 A to flow in the secondary. How many turns i51*d ,k9ei)4fntdz lsmaq 5k 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 turnslwc6/h )(ml zh are necessary in a 110-V primary if the 24-V se6l(/ zhmcwh)lcondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a xtl f)z.p 0j(g2000-turn secondary coil. If the current in the seconda f.z) pj(gx0tlry 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 primary of a transformer.e/3zjz.y3 x he Assuming 100% efficiency, how many amzeh ./33xy zejps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Theprwi :0ewcp06q2y9d,y zyjrop d0(8m primary coil operates on 120 V. What does the primary drad 86 drw(eq p yz0 ompy09wi,cyp:r20jw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformerkiar g + 70g)t0wjph:s has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage ish+g0:k t7g)w0ij par s 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 seco fxzuv zhc(got (1h1d x*u ,jh/6obc,0ndary coil. If 120 V at 2.0 A is applied to the primary, wh */zv ou0jud1tx(fhz6(ohb 1g,,ch xcat 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 200 turns. o z8 qu;i wn1cb2vw()mIf the input current at the primary is 100 A, we can expect the output current at the secondary to wm(wqc ;v)81nu 2 bozibe

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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 i6s fqu j,o)4.xvyjr a6ts secondary has 200 turns. If the input voltage to the primary is 100 V, we s6xo).4ujqaf vj ,6r ycan 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 1u ry59o(d0y0 0)p ;mnbkhj amd00 turns and its secondary has 200 turns. If the power input ok090mhap(5mr y0j;) du nbdy to the 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 current at 120 V.a63(wu r we9oqs0j(vsl c 5aq1;un5t6mirhm 5 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a powersv3 mnr h5e 06;aqcwmr(a55 su16j9i(outl wq 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. Thez2bd0 rqn y,8k voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost inzby0,nr2d k 8q 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.a7gbjf (eb 7xd-uwq30 The voltage is usually stepped up to 4500 V by a transformer and transmitt(bx7dab f-w 7g3jq0u eed 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 kxx ;ahg.t6i /hwudi41 m 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 i1 d.x 6wihgtuh4/;axturns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resiyiu 172mkn7kistance 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 ouyik7 7mni2 k1riginal 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 linp+6 rjs)fo vvd1m97m be at 1000 V. How much less power would be lost if the power were transmitted pd) +bj6r17osm 9mvvf 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 transmw.o -5 f7gwixtitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not tofo7tgwwx-5. i 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 i ildshm8 9(jeixkq72 pp:233uhb/ h pes stored in the coil's maupp/s3:hex e h( b283pilh7 jq2idm9kgnetic 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 inductdy3h2 ,(clu2 lyl 6, mcqae 6lz7ked.hor. What is this circuit's time cqe mcy lulklh (y,h,e7z36d2dc al.62onstant?

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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 z zj lgg9j/3:t:fap(mt3 ne;t 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 plac z;f(b2g6 is:p/)x gcq o2jqyged 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 idm kt*e2,c7b 1ql*g+awq6wwa 120-V AC outlet. What is the resistance of the lam gw1qdwm wq*2tl ab,e+k*ci67p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is4g+jawdjz tk/ v328gx the peak current through the resistokjgdz wx+3 v j4ga/2t8r?

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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 power dbr5b:)e r2kv6fs si7v06mfd uissipated in the resistv7e6 frr sbf )mukd b:v025is6or?

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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 resis *g:ghbu-dq;2e m: unytor 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 resi l) dpnp;vl/k). ip*wxstor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorrgklp45 6.wc yle j -xt,ff90u 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 o.: l)i5grr(6qg-l n3 te nbfm;) xgweff a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance ote:ohdslm3l6 bq2h82 f 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-mHn-8cor:r p p:k 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 induct-b8xz(yfb:w n*(y jfs ive 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 w6xt mr1b6hqu1hen 120 V AC at a frequency of 20 kHz is app1xthb mr16 6qulied 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 1 zc7(jmk+jx1qxj+ruweh5*fto 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 capaci *fio, desvh8-l jj:lp (iyr6irl8;9mf:8 uh mtor 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 j6 e+kso/ dwe)is needed to have 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 r mul 8:lo6ev/g+ wpqom0io 54qeactance 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 capayyo r9*h uz: 86o un;yyu,3zuacitive reactance of a 0.010-mF capacitor be 100 W?o 9u3r :y,uu 6zz8 huynoya;*y

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF 3vwvt0r3p t4wcapacitor 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 12.0j.zsz+n/jm q))kdmz4 W resistance, 15.0 W inductive reactancenszzzdj )mj.k+m/q 4 ), 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 100mrw 46bhku(u;5 zli9 i-W resistor, 20-mH coil, and 1.0-mF capacitor are connkbuhm 5(; ziwil694ur ected 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 1502a6 aj8wi d.midkr(k;0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connr86dk.dm w (i2iaj ka;ected 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 7dga1pwyd 6zk;5x fee re0l ;5a 20-mH inductor, what is the impedaz ra1ed; 7xp0e;w f k55yglde6nce 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-ym+.x k,jd,ple+kg5 lmH inductor, what is the phase angle 5,kd.ylx,+l+mpg ke jat 1000 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 )) qrfq+ p3 ;k;.a qsu,qftawkin a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzpaqwft+qa; q 3,q r.)kk; s)uf?

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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 capacnzc84ytw zjdx p 2k.*3itances is needed in series with a 100-W resistor and 15-mH c 4y2*zwj3tn x.zpdck8 oil 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 a tm4-0f dqft zulf35y5 c-w-c zk*v5 pyvotal impedance of 40000 zyvl5d-5mzp-f3y *4-0f 5 cw ctqufvkW?

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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-MHtq) jg4 7i4tyk;e+qdiz for a totqei7 ;q )k4y i4g+djttal 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 20-mF capacitor. Whu4mnuk 22dcyuu ;-+ ksat is the impedanckym u+u2;- s u42udknce 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 need o3mq9sgv7i. af**jjjed in series with a 10-mF capacitor at 1.0 kHz for a total a.7*3moijqjjv*sg9f 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 xmdw9tlj-, de1q( sl.9 kf(ijin series with a 10-mF capacitor at 1.0 kHz for a phase angl -,fl9djjeqw1dlikm(x(. 9t se 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- oy 13slle7i)gW resistor at 1.0 kHz for a total impedanco1 ys3illg7e )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 1e/hai w9w5b .r00-mF capacitor at 120 Hz. What is the phaseria9.eb / 5whw 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 coil, g )jscnk a;*8hand 1.0-mF capacitor8 asgh*;)kn jc 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 capacitofs odo3v9l 7fhf e y:;4n53dlh nr)qw1r, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whatf hfl3nv 1woy9 fr3h;d:74 )5neqsl do is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, an3jb nawo0j:x rm9+z f1d an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circui1oajf9: mx+03 zrnbwjt?

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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 containing a 50-W resistor, a o1d+ sg3m( 4 5ffelpxx10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poef1p x 3gofx d54m+sl(wer 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 g 8mj0k*h:hq nin series with a 500-W resistor for a phase angle okg0 h hmj:n8*qf $40^{\circ}$ 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 nu)c0 rf; wvksu-m5*l= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximns- f*vu5 m0k;rlw)uc um power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance,rw lhe ec5k(k *a)eet/+c*w2zo tpd1- 15.0 W inductive reactance, andkc*k* oc wh e(erel/p5wd+)ztte 2a1 - 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is omevxh +/.yrlw)w*-(ub. zqp $63^{\circ}$. 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+tk99 q+a yvdoua,hr mju 5j 7at*9.in 60 W and a resistance of 30 W. What is the powernkmi 7r d.v*a99q ujt,ty5+h+a9ajou 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 faak 5 m.; q80favllnro(ctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe5fklvaron qm( a0l. 8;n connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil id gp5v izbs3n.2/qk;bn series? zg/3b5piksb ;q.2n dv

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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 capacitor s*85ibcaz/vwnn b b56 for a resonant frequency of 10 kHzbv/*56an w8z ibc5nbs?

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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-mpx3d-n0fl ;7 hgp9c6 rcgdojy83e5 b2issrm+ H inductor for a resonant frequel -f0ix7he3m sg5+823 ;dyp rpncd gr ob6c9sjncy 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 rek(wd(k5dno( r sistor and a 40-mH coil if the reso(d(r5 dkn(w konant frequency of the circuit is to be 1000 Hz?

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