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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: 游客未登录  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 flux4p:+d)n2 * tbtswzzha 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 inductiorxoy-d k)*/om wp3l/u3sa:nriy t; ,y70te nvn 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 produces whw7nh)nhyn,.qdg2qik 9r- d6y at kind of change on the indhd2h qinr-, 9nqk7n.y6)dygw uced $emf$, 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 magnetiu fg0r5 5o4/n6zw7tf9 egmydbc field through a loop of wire produces what kind of chaz7 e6wn/ourm4 gd5fbt5y g09fnge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind l.yr i:8csihec1st8mr9ip79 of change on the induc.hc:7rys1 pm il stire98c9i 8ed $emf$, 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 magnetic field anj;a8 hz 0*x5 v siclpj3sh)kx q/s86kl $emf$ 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 dirx+7zpfrvf gqg4a1 s(5ection of an induced current in a conductor will be that which tends to produce which of5+vqzra17gf sp4 gfx( 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 aboc 4wl +agn 2o1)z6zaopve its center with its north pole pointing down. The stationary ml62 czzn1+pao4 oagw)agnet 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 magnet is held abopc r 6)4jwvr)o fr4kkay-8w6pve its ceny)r -aw 8fc4jp r6)pk6kvr o4wter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vecvnawn 5k;)s/ v54tvgu tor points straight up. The magnetic field vanishes suddenly. When viewed 4gk5sawvv 5n;)v t/unfrom 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 whemejbljma:(y9;-3 hp j re the magnetic field vector points straighty e:mj(h-a3ljpj; bm9 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 horizonthqc 5u my--1leal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fi5 -uych e1q-lmeld disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-z5z o5gg pz8 h;b ;q3bn01dpevincreasing current northward. Two coils of wire lie flat on thezdnpz;hzvg0 b1pge oq;538b5 table, one on either 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 loop of wire with the 9vpb x.cs +;t5)52yi0 qwfpw5mcfbw j uri,p5north pole entering first. As the north pole enters the wiqib)pmp w up5ywcbfv0f5ix,;s+rw95 cj2 5.tre, 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 rotated at constant anguh9+ 1m:syd1c xwvse ,flar 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 1f+w9vxesshy1mc : d,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 rotated at cogl t3 7.wi.3nxub4i gmnstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be th3gi.tumg3 wln.7xbi4 e 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.mz,iz:p/e 4d*s7bjup cqb0)n
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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 th2adhgui *v1dm--ru;c at 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 fiecn k:j.ge +ahd*0/0tjgb8cg km2tkx (ld. 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 no9irrtwrez 0jd18gre2 yt(+ b4 rthward at constant velocity through a magnetic field di8+ rbzej91 2gtetr 4 ry(0wrthat points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular (r cd6kn dmt z+x+-j .l)aol*rvelocity $\omega$ 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 ne2bjhr/ i ,n/p /vnh: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 zod8ujc; 0ow +each second. The frequency of towcd;z0 u8j+ohe $emf$ 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 tlpiwjo ;r+7jpmww) a ct8.d39o

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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 tl63cs-4ms nla)c0,rc vwy7x ohat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ifn e-0(my ur*ye the secondary coil contains more loops than the primary coil then it ( yerunym* e0-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 loop3cim;;+twgui(g0 c kos than the secondary coil then ikctomg(3cgw ; iu0;i+t 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 inputnvox n urwot1 2ftp:3 *e2;(gr

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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 circuizw, jahger6p015j: lv sy t5y:t,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected i9 dm),:x9xyl8rjjelr n series to an ideal battery of constant terminal voltage. At the moment conr )r,j9xl:j yxled9m8tact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are a fhwd:m2:;ewconnected in series to an ideal battery of constant terminal voltage. At the mom:m:2w;fe dh waent 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 connech) r79-q g 1:rh6jsdq a:qcpttted 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 resistan5c1xn s ,m8reb2a;p wice 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 conne4bn pdsrxk:9o6k d3zve1- w: 6p w7fvhcted in series to a battery. The time constant for the circuit represents the time required for the current to rk:s9:dbkx6h6wrw -e37pn 1oz dpvf4veach

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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 eln 5b .(os.zbfaj.nq 8 dp27tare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of t(d7al onpb.zf.2t5 s.e8 jnb qhe 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 have the samer71 dyao;qlqzdvee0.r: b d6 . 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 this ttzj8f (p84w; h1sqjvn q1 ft6circuit, 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 c7c-1t+g hj6w2ijhzh xonnected to an AC power supply. In this circuit, the curren- h7h2x cgi+61 hwtjjzt

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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 circuisvq4) *ivy9c4k*pkv z t changes by what factor when the frequen pv*ky4s*v v qi9z4)ckcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage acroioa c(*p 2fjp.ss an inductor is doubled, the inductive rc(*pi af oj2p.eactance 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 across an inductor approaches zn1 (na o; +2 5gw6p1poanhcijmero, the inducti1 nowc1;n a+aopj52p n(g6mh ive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the dww. yeuys*1 5currey 1s*wey5.duw nt

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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 wheai*o wbo ;.raai7a3/ln the frequency ol*;a.awriaboai73 / is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a c ;f56 npk7.r* fajbr3gdcd ur0apacitor approaches zero, the capacitive reactance of thaf pf a3;*r bc56rrjkn 0udd.7gt 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 7hr k 95gbvyeqx /)z;eof the inductor and capacitor in a RLb/z qvg97 ehrky; 5xe)C series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is definedun.g .he b/e.z 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. lx7s rm+h)yp1,a90 9ycqo6y znbyj l: The impedance of the circuit increases if R increases. Whoj7zy n:myrq+ba96l1 y9p)ly,cx sh 0en is 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 thlr 2ok-h;3+ 2tr (jv yjmuvgp8y:)kdue circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Thw:r;gzu im33se 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/epg2+z * lgjyz c2z2e both double in an LRC series circuit, the resonant frequency of t2zgcjpl*2 ze z2 e/gy+hat 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 apv9eb- w g8pbd1 q7em8nplied 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 occumvouvib j yx)1of -*03rs 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 r. m, vzlg(k1jlbw4t* 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are mrw1 kb jllzgv,t4.(*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 rotatinglqh q(armvj/ yd-.hf*h+60x e in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perf h*. h 0x6ay(jq+ml/ vhd-qerpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20l/j,wnbl45 u--xsd6m bop gi, T. Fiouxjlmb,/-d 4i,b spl6w-g n5nd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is7xcue02t4 l z2ek.jua 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 changes f,,wi pynt-pdde u.)hs:j /vp,9 vjp6w rom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with si+je. ;*q ljqx mi-1kzhdes 18 cm. A uniform magnetic field isiezqm*l -jx;.kj+hq 1 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 t lwwv5k25bn) ourns 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 ;otkxb paiajlwh q4 ())s )o16 b)/mlfarea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thecqh. e)cf r6xqs*s(/ g2ofp:s downward *q(c c6ffes:)phx 2orq. /sgscomponent 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 roa 47rdi0ftv6j tates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of40v 76a fdijtr 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-sect, cp 024ibecneional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ryvf8-e *s*c+.* w02aox p;nfn dtv p5u4ijwcof 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;a+igkra z-cr-kq 7; d 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 icrkz --d; +aakg;qr 7in 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 of wire of are 7drvne3 8sbj*a $0.090 \; m^{2}$ 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 s yn-jt7t*v:k /(rxz);+og wxo7bvo wfimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Itzw:ryf/ g7; +okv xjbowx-7 nt(v*o)f 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 maximu;kgk ,lu o7:odm $emf$ 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 r dha9,i i+*bf*4bwkjlz *wab ;esistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 kzof8:m iq( 6cp1kd; f6f /gbyW. The motor operates on 120 V AC, and when runni1/fbm ic6y:fdf 8z6;kkgq op(ng 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.q0)l g+-jhtz /djzd/r 0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren)zjd0tr/ +/q dgh-j zlt?

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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 rum. vepx(7 t mr 3c.u9*rq,2pu9yekyj esistance 6.0 W is connected to a 24-V power supply. The operating curreypmtmk9e 9cjx2, u3e*vrp. r(u qy.u 7nt 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 sc2e v.w3e 9bdconnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ba.vw3sd ce29eb ck $emf$ 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 voq(zm53i/ q(yck3 k e+3pc tw; z(jsaoxltage 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 tranj 1fm+mq+: glq23 vzbvsformer causes 14 A to flow in the secondary.fjq1+:m l2zb+vvg mq3 How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necess nuv*e,i ohj62ary in a 110-V primary if the 24-V secondary h *j,n i6hoevu2as 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 2000-turn secondary ..(q 4h(sllasdpzi c; coil. If the current in the secondary is 3.0 A, what is the current in thea 4s (.lzdcqiphl(.s ; 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 7dkhi *ft0o rr9ix:o 5l/l*j-lv kv c-a transformer. Assuming 100% efficiency, how many amps at 24 Voi5hl-r l-c/*tjvfok xk7d:i 90lr *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 u*dx5a icx*/ 1nor aaea+o /5, pfli,oneon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does *ei/i1r aauxdf,pn5 axo5, +oc/*l oathe 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,ui 2dv16yn0c rica9is secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the s 1ncrvic9uiiy, 2a 60decondary?

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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 andv n 06pb-0e)mqkzhta 7 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,7n-bz)p6mq0hka0e vt 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 transform j :xv1lh1xvqitt39k0er has 100 turns and its secondary has 200 turns. If the ik0t9xtq 1lhjx: 31 vivnput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hab3t vlxv 1y+: ai1/1onxrrin)s 200 turns. If the ):/xtrr1 nbxl yi oni13avv+1 input voltage to the 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 v74 u(zo5j sby:mjl+l. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectingy+4vjb z: m7uso(jl5l 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 voltage is usually s mbwvk i4wy;z6j18h y7tepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns 6w 8ib hyyz7;w41 mkvjin 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 cu2lmst9 e/ nd;xom;osp:j gt;9rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lj;tn ;9;do gsex2 /9p :smmtloine 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. 49ktmg( i:q8 lxkx) le The voltage is usually stepped up to 4500 V by a 4)xl8t mq 9l:xk (ikgetransformer 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 resistaf ;clkm2:u*buk qwnr*-;(bkz nce 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 w;l ;kb ub (q*ur2m zkf*n-k:cwith a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance omxc- z ,(kndqqsmhjaq50+m m+f i+f 53f 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 the0fmdi+k qj 3s c(5z nmq+ +hfm-5,aqmx original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powerjwt xtd 9gg9cy3bw6* / 8fuu3a would be lost if the power were transmitted at 3000 V instead of at 10003g cw 6xua *3ydg9bwutjf89/t 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 -n0l+szawc*f i9d2 xk A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generwkx-s02acfi9*d +z n lator 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 currnd5rhgh9vm1s m4qx; 0g/ r o)fent of 5.0 A. How much energy is stored in the coil's magnetic fieldd905 rog 4/x qmgn;sh1mh)frv?

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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. -pnm iizdmbaf-m02 1v6k-ds 5 What is this circuit's v bk20pia6 dfn --s d51zmim-mtime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltagep7rwsv-i:)m b is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cu gk92q)u6vt hin2b6xnrrent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the laf2newlh pp8+9cka; s 6 f+ew9cs6 ;pklp ah2n8mp?

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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 isjeg+f h7-cd *q9x1m9a jqr5iw the peak current through the resistax-jif*7w1 9q95 q+ ergc djhmor?

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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 conny9c kbujrz6mk-i4 gzw( l;t1)ected to a 120-V ac power supply. What is the power dissipated in tu6t ;zjc)( i1wkm-9 k4grlbyz he resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is7ctbcz 5ob 3nsq/(p9p $I = 0.80 \sin (240 t)$. 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 55x5eh+fp r:vt0-W resistor 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 r sa/0( phbqp p l/c7(a44ts pm7d:ivigesistor 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 ;8nffsn)+st d 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 f r s002x5,zf-ih mkeoreactance 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 wil+b i6tx5un d,tcg((svp xj2s)l a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of (.fidu--cpd a inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inducve0 a9w c5(,fg zod vpxrmu4;/)pxub (tor when 120 V AC at a frequency of 20 kHz is avw r gdu(zom45x;e /p0cx 9(ubf,ap)vpplied 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 d t.e(qyqm m)9aue 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 rea ,c6c rf8lk+sm2oz a5actance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reacmom rwx/y*, nwf2uue ) +65heutance 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 capacidp2s3-9e ;z xfhjfqr6 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 capacito+ 8- jb(rbqh 1kv og3k4b/;oqbnc)xq pr be 100 Wxb3p/voq)cokj -nh(b 18 g bq+;rqbk4?

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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 + h7.f aop s5)5yynwldj4zcm2capacitor 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 serbyf0:xypq i* r1vj ir71t6o 9) ix6 yh,ii3abties circuit with 12.0 W resistance, 15.0 W induct ,t)b1iiro6qaf xi*9yr0hixiy tj1by63:p 7vive reactance, 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 resistor, 2q/ b (k d:ojn+yt71bfi0-mH coil, and 1.0-mF capacitor are connected in seyb(+nk/qi1 j dto: 7fbries?

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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 t,d:35hv, t ldpm*qh ,vpk8w cif a 100-W resistor, 20-mH coil, and 1.0-mF capacito:,3pwkhm d,5tqv8vctd *h,lp r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is5 6 sd i.c x+tihbk071piejs:d the impex.5s7b 6shc :id1 jt0 kpid+iedance 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 inductor, what is the y( -ui ;9emdrlpl-du9yei(m ; rhase angle at 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 in a series circuit with a 20-mH coil and. mu9( n;b.y -bxts+f qr/gnus 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?f ybu9+qmn(- nb.x/rtsu;sg.

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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 wit)w-6bif u*0gylollg/h a 100-W resistor and 15-mH coil to get a0bgwgi/l)l l 6fyuo -* 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 inqi rx0nqkfu*go 9i+j. l142(o l/e i3 kvg0sjcductor at 5000 Hz for a total impedance of 40 09/g0321jif q r*juo q4 gix.(s+lcv oiklken000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz forj l6url6,bd no t0p22j) c3cmb a total impedance of lmc 2036j )2nt,pul6obbrcjd 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 connectedfht. zjo0z*+o;.+dvfw 2iu k u in series with a 20-mF capacitor. What is the impedance j+;wt duhoo k.z*fv2f z.i+u0at 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 wi g k;rkl9v0)oath a 10-mF capacitor at 1.0 kHz for a total impedance gk9a 0o)k v;rlof 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 serhn gcm:x-)ij ;ies with a 10-mF capacitor at 1.0 kHz for a phase angl h; nxjgi-m:c)e 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; p bz71hubd;r- +wtet 30-W resistor at 1.0 kHz for a total impw+bu;tp7eztdr;1b h-edance 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 100-mF capacitor alsp/rovx.lo u80:: sdt 120 Hz. What is the phass lud lxv. :0s/oo8r:pe 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-Wgu5n9l1p1bfrsbot7bwgz l 6: c4 wv53 resistor, 20-mH coil, and 1.0-mF capacitor are connecte4 1snlgo bf6l9v3 gup:wc5zwb15 tbr 7d 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 4rdy0pb7i2df consists of a 100-W resistor, 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 r4p7d2 fd 0ybithe 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, aq .:i ce jfped,qw/(:vnd an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cur/:c vq :(pjedw.i,qf erent flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuim0t-hswe * ;zjt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when eh;zswt0 j -*mconnected 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 resi)2 wf1yd sgzbn/ sl ufpwa5+t;1 t*:bwc79 hvestor for a phase angle of 5zudew/7fhp;n 9)yfs1c1b lsb:v*g2wwa+t t$40^{\circ}$ 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 =9vebkrrif4 h 8s/d :0w 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferredb9r4e/ 0i8hfd wvrk:s 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, 15.0 2p0 wr71fgh lnW in2lwn7 r f0hpg1ductive 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 AC cij5ser ,g 5j.:yt7c8b6tyyrx d rcuit 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 r2)z7p sri uqitdhy8 -mg2m8 h7esistance of 30 W. What is tthm7-rsum gpd) 2i 82q8yihz7he power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a kevvb-r2( nh 2*, f.rm dqjz5i50-W resistor, a 10-mF capar5q2r .nkmv h biz(v* ,j-2edfcitor, 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 freq-jz. yo2vk qzmos*..quency of a 1.0-mF capacitor and a 15-mH coil in series?qyvo*-z k .jqmo2.z. s

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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 for a rm-;y k5 s-gf+n *puvsiu jcy++esonant frequency ofgscf+*+kiyusj -y mp;n5u- v + 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 resonant frequ:2z yykois8*:lm u0l yency of 1000 Hz?:l8 yo uy0yki*lz:sm2

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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 serie 9mm;pz6 q*fgr5u .spy2ux 1a+e-: 8voxyh dtks with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?dp oe1hx *my2s 6ua8m9z -+ .y5pfqxku;g:tvr

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