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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;qk rejge+ v)9x) i x2qhig/l3 are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction s (6 tmqomx.z)htates 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 producc7ii3spln 17 o,m cwt1es what kind of change on the induc7o l ci3 icnt1mspw,17ed $emf$, 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 fiey y3oud6(f0(xdaey( c ld through a loop of wire produces what kind of change on the indu(3ux (dcaedo(0yy 6fyced $emf$, 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 change on the indosiqht1939 ht uce 3ts1i9ho9tqh d $emf$, 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 fieldlqlpxa+ 6ys7, s /y1, 3p4fwo8 eqxeog 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, tnn erzyoi**-3 he direction of an induced current in a conductor will be that which tends to produce which of the following efoi-rny*n* e3z fects?

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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 h,fngza6z60( y3rnl g on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vilh f 3 rny,g0gz6an6(zewed 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 he ix5 egob *;o,f6fj2mzld above its center with its no o6 gb,o2xemji5;*fzfrth 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 maq a0 arzlvl 2gzq;b2loq+55x1gnetic field vector points straight up. The magnetic fielq2z ;z5o vlaxa2l1q grl5+0 qbd 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 95 jwxu9 );qr0lwx ctrtable top in a region where the magnetic field vector points stru jc)xr;0rwt9 l9xwq5aight 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 i(cy3, smmbo8 horizontal 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 s3 omc8, i(ymbthis coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on z8uvr*m .:qcx .rrb/ sa 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. Whbr/rc .qm* sz :8uxv.ren 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 througp6w -+ q; dqeogx0kp yx466tg 50ravygh a loop of wire with the north pole entering first. As the north pole enters the wire, the ove0-y+wx ayr606 6 p ;xpkdqgg5g4tqinduced 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 angular speed ababnig9ffk)62 a0lpo 1 out 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 ip6nao i)0ag f1lf2kb9nduced $emf$ 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 angular speed abouf*uz;lr ,w1;pwj l.nui8 tp2f t an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation ow w *1jpluz;;f,pitlr.u 28nff 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.p 9wljpkb- l*c--2uk l
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a;cea8:dnd) s-*tqit(p i hv g3n $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.m62fg4v ;bx mj 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 (orienv3h)s 8d mk2nited in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statements 3 i)n2vdhkm8 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 rota:s1ql1 ,)dfjg/ ji bvltes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformsr68uto dvsx0x )apb(1o)y/ f w

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. gaqan/ ke1v3snp. p; 24jjnc+ The frequency of tp 31a/+c 4n; 2s gjnjapk.neqvhe $emf$ 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 usedipw a;rz- ,8ky 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 dckw75 m4anm/v evice 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 secondary coi 2ux7 aba75tzasxdj jw/ q5wc4/k..yvl contains more loops than the primary coil then it. ux./ 5wv2a bxq7as/z4jyawcd j7tk5 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 corjo (gw x; 0)r9txzo;pil contains more loops than the secondary coil ; 9opr; ox t)xgjr0(zwthen 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 ahzt7t(di w- i -dx.*npower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci *wk -3kve(mkfrcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal (9s rrmh9 byp6battery of constant terminal voltaphm9r6r 9sby(ge. At the moment contact 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 connected in series j1fvot7.clv 2 h)e n8fto an ideal battery of constant terminal voltage. At the moment cjf2t lo c).vvnh8 e7f1ontact 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 resisb7(s tq ccx), z1msnu3tance 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 inq zog::r.( exeductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batterya1decr)9jgn/uqf vm6a*p zy:+ l)d k4 . The time constant for the circuit represe zkydjvdae):4*g+up cn1m) /6 qlar9fnts 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 battery. The gi:1mm-t8nig 0zv 7bmbattery is suddim-mmt8gzg10i : nb v7enly removed from the circuit. The time 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 efs58xbd p*h .have 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 t8 hj3g w2jx8hd ukclgi :p i;,,xr1t.xhis 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 an AC power supith /+aa.h7 bxply. In this circuit, the currentht+i7/x.a ahb

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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 changes1do48u jk7uzoig d03h by what factor when the frequency is tri o3g7 zdhk4o u10judi8pled?

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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 doubled68vm w/br7* /nbh+qcf8v c puy, the inductive reactance of that *8 7f/qbphvr c8/nyvbc+ uw6 minductor

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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 i7 t2pkzam8zxzs jcz3u x,z6*+nductive reactance of ,8 ucjzzt7 kpzx2+ *xzas36zmthat 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 c sr6pjgnw)) j3 2bhu)hurrejwh) jhugsbnr )6)3p2 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 when nulmh 8;.w1rk dkev 6w.y2l)k asaa;(-m x.ttthe freque aa;v-uk we6.ktl2 lkyras8t.1;)mmwh( xnd. ncy 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 capacitor approaches zero, the w *9qee+skb2dcapacitive reactance of d9e+*swq2e bk that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and can sfo8a; fb(2su: be-xpacitor in a RLC series circuit?:b-;noaf f 2ue ssx(8b

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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 defined:9i+ g/er v)bc eho4pz 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. p.vz zz b sdo1-b 6ca.axu7yyw7 qh883 The impedance of the circuit increases if R increases. When is this statement true?bd b. y7qavw1a3z-zzo8 .s6 8cuyphx7

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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.q7 wgs8o 6ssrjk1j3az6rth 5 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 cr d:05 gt.nqmect7ox5ircuit. 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 capacita*fv*q*qvj c 7 g9*c5ni q:dfhfnce both double in an LRC series circuit, the resonant frequency of that cirv5 q f**d:cqjg*c*nqhff7v 9icuit 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 resona66h 1*/xxkx w9 tsi--echqpq xnce,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whede 6 ql:dl5a,r i jij*nvoiuyt r107(2n

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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 raty*m( oooz9u2 dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop o9tyo(um2z* o 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 unifor9 x 8 qflo-h-a7i2bj5xluprl-m magnetic field of 0.20 T. Find the magnetic flux through the loop w-r p5il-lo9 xqa-fb2 8u7hx jlhen 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 0.10g(nqcdw5 4:yo0ly cb* m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when tg: (nc0doq4wlyc y*5bhe 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/bzqqoy, 4+rf adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes froh:ar aylz .b +s9ol42a0,ibirm $4.0 \times 10^{-5} \; Wb$ 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 squarxbt n).ov46ii1mbzu) e frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chzmo b ubvnxii1)64).tanges 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 7tpupqfet /oiu,+dm(o42 /k o 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 ar wo3:x vl0ul*o*v p6vth/d ov7ea $0.20 \; m^{2}$ 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 locatvh, - ewy-6oztion where the downwazo ytvw6,e- -hrd component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar tha9*jk r2 )4hwe(xrafwat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throu*f2j)rh ear9kwxaw (4gh one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area o.h u0evimvls /e+8, 2xqu6 xeef $0.25 \; m^{2}$. 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 wz6n-+xus()z;3m la g b3nvwttz /d jlr11hu 1100 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 lxksa; /3xcmhlpy9 g7*oop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotatiks7hxag3 *9ly ;mx/c pon, 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 ::kn zxrr0tn 1wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with qmi9cx0u+ii h+7 133os v67jzwseh sqan output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. i+o +q36ezihjw muivs 30x 9q 7s7hs1c 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 genery4i(a 9ieev smh3 :k,xator with 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 of 6.00 W. Thuqq+3 xpk2rih7tl 7 k,e 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 W. The motor operatesz3dxuonym7 * s04v,-b )m reco on 120 V AC, and when running at full*srmoc,u7)md o34exbn -0y vz 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 3p e l e. -md:rus/ap.jleg3a1to a 24-V power supply. The operating current is 1.0 A. Wh3p lgj.ue: a 3rpamsde/-1l.eat is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is chcp98w s s:ufg1oq jf4u*(sz8onnected to a 24-V power supply. The operating current is 1.0 A at full8(p gfcj8q1wzf su*so9:4hsu 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 i/ 9lfig7ban*j s connected to a 24-V power supply. The operating current is 1.07 j*lna9/ibgf 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 primary vppijmgmxhtj 8*ba ,6 :e8f-wbmf 96q+oltage 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 flogl 1iu /cfwcc -/1,ckaw in the secondary. How many turau1wc i,-c/ c1fgc lk/ns 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 turrw)y vvszn;.-w2h f*y.nxw)p ns are necessary in a 110-V primary if the 24-V secondary has 100 turnsvw;.y rny* vsw-w)xf.hp )z 2n?

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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-turnr1 6g (1jejliq0i+t2 g. vuvv8ybtfh; primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, q8gveljgy.2 61vvtf0r+ i ;ht j1 biu(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 traii0)ovbtj0z 8vmgnp4*9ms 2 gnsformer. Assuming 100% efficiency, how many amps at 24 V can flow in themb2jvi*8i)sg 90nopm4t0 z gv 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 Vbsu9-nahz81pvqb+.2w 8 ,2 kok vzuu 8a sd/ng at 10.0 mA. The primary coil operates on 120 V. What doesuvngquun ka+s/ zo2w 9 ,-a8b.ps2 8b1hk8vzd 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 coi9v ninx8pq3 rg1ebm/+- ulx 2ml and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primig1nmp3 un 9me+/lxb-x82r q vary, 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 primye:v2*l yk qn(ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present ky2l q(y *n:vein 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. yh/wmk/ m)u0*6 inc/ f fj0oxk If the input current at the prima0fnf iu06 w)jk*m//ch/o k mxyry 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 annc*2 :wuv2u+mvj+elz d its secondary has 200 turns. If the input volwvzeu*2l+ +:j2vuncm tage 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 200jl:j7:4h jm*bgcj/gh turns. If the power input to the primary is 100 W, we can expect the poj j::jghm7*/c4b lgjhwer 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. The voltage is usually stec/n-mf 4we* vk+9ifpgpped up to 4500kcff/e+pw-n v9img4 * V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a dwqf; t);2wjpt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through wqjtpw)f2; ;da 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.:dh0/h9sl mo)ez*orq The 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 perce90o ozldh/ q: em)rhs*ntage 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 halv*so;p.1r ,w hbwr8ls a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due t vlhwo p bs*8l1w,r;.ro heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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 lpaq,z0 90v2 5xkfqq2dj ,i nskq9g:*f(whsby ong has a total resistance of 0.60 W. A generator p (j2 h ,f z0bpsyvqg n*f,:5 xqkd0qki9s92wqaroduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 ( fgp8 zx6qtu66-W line at 1000 V. How much less power would be lost if the power were transmitted at tgf86xq(u6p z3000 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 44f q3q pa hvk0)-cari2,w3 wl9e0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped uqifa3 whv3- p l9r,qawe)2 k0cp 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 j fq+l 5 zl1pij*rc+*f5.0 A. How much energy is stored in the coil'sf5l *fr1+*jl+ jqzci p magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H indm34v88aww a df+l)sqouctor. What is this circuit's time con+waqaf)sw dlvo83 84 mstant?

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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 e0t kenx)9 nc0where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What ijorj 4.hqg u92s the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC ou /wkiubn9a39c8wk/c yih-u 7 0q-csz ptlet. What is the resistance of the lauhi87wau p yb-c9sk0nz39i qk- wc//cmp?

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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 is the pea2aphb+mcwnk s25j7*m a* t2xtk current through the a+tm**kc 2ja m 22 5txph7nwsbresistor?

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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. *i1pn/tgmdj rf:uytdn/v4 /biw(1 3d What is the power diss1/p it*3dj1mdi yu/(d:/ngtfn4v wbr ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ise12t7k:p zbl*ky18elzw+ c2hk wu1 k o $I = 0.80 \sin (240 t)$. 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 resuie:ilu( 4v1p,. m 5;suni qzfistor 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 resistor is5- -xzu*z zcv,iipwt( $I = 0.80 \sin (240 t)$. 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 akmc1 ;pr ;b+qct 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 100gxab *l6 a6-pp0 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of indu 8y3y9jobhwy,(v52g f5d*tr *yihhrfctive 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 mo888b oge b0zz:8r:phfk4dys( f n,aHz?

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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 inducl2zi nj7 f,shkme+aa:jm8w(/tor when 120 V AC at a frequency of 20 kHz is applied to it?am+z8lj,m(7fi: e jksw n2 ah/

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a fr;hw *nv5jx)u+)ls 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 react tl 0h fybuxm8 h:3qjw/hbq)(9ance 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 50oip l+8)aj6u u 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 havd*k *s;ppiq- ve 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:nw5hg q21hv ph6dod; reactance of a 0.010-mF capacitor be 100 Whdn d:qh h2;5v w61opg?

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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 capacitor at 1000 Hz an:xre .vz.zhh2;a5 ,tjo(xjw r o9 yd.nd 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 circui:tc*-ars1 dbq8ue +mx t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive 1d aq-8:txu*em+bc rsreactance?

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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 q qpzi *s;-* 9+ lokdnf7tu9nr100-W resistor, 20-mH coil, and 1.0-mF capacitor ar;ltqu+fr z7sn **k9dn q ip9-oe connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 208w vj puz82z4b-mH coil, and 1.0-mF capacito2vjuz 8p48wbzr 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-;8u*g,rp nf0o 0lgkg8)dff bamH inductor, what is the impedaa pf;*ul8r0,gn0fbgg f8)dk once 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 iwefgr1 0 zf5zq1 299ts i2fypnnductor, what is the phase angle at 1000 1pigsnf0 rf25 e1 f2zy9tw9qzHz?

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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 1.0-m93ds:pn0 bi*2i)vt6) h f.jpd vwyxq hF capacitor for a total impedance of 100 W.0jpdihn3 9 w)btdsy6vpxq)i fh2: *v 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 cf4 9x,yrdg ou9apacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 11 4g9ox,9 dyfru0 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 8cavw:c.xas3sqs9 o, series with a 450-mH inductor at 5000 Hz for a total iw3a 8a9vc q.ss,c:osxmpedance of 40000 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 resis+lx mvv0m5aa 8a mdn16tor at 1.0-MHz for a total impedance of 150mv +50l1mnd6aaavx m8 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.at+9t3jdgb ev+, dmi-mF capacitor. What is the impedance at 100+jgt 3t9d. ba+m e,vid0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF n22 tb;vvpvzgwx), h8capacitor at 1.0 kHz for a total impedance 2 x)z;pv vvb ,wn8gth2of 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 6f )exlapz r+ ,wbwwm(zotg.it05-2 useries with a 10-mF capacitor at 1.0 kHz for a phase ang+la.0,ebirt2) 5z(z - ftpuwm6 xowwgle 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 1.ma+jm+kc u pe :/o6/alcbb 85y0 kHz for a total impedancpkcja6 e+:+y 5o um8l /acbbm/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 100-m msrkoin*j4w0qdnt7 f-2. dn;F capacitor at 120 Hz. What is the phase i mk0.s*wndt-42 q ;n jof7rdnangle?

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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 ressj g*eq1,2 ujr:rk:jxistor, 20-mH coil, and 1.0r s urg,2x*j :k:jje1q-mF capacitor 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 ,z4u 9t(0ofj3vl *k xbhzgvq2of 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 gqz09vkz( 2v4uf blot3*hx ,j 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, - mq;y4l5oy wa7o/emkw/2-km thrif4a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sour5mol-iw7ae4yo -qf whr2m/m4k; ky /tce. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit cl424t ylkj 6geontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-g 4ky lj4l2t6eHz 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 ina71db f,m: rpx series with a 500-W resistor for a phase angle of fx:,brmp 1d7a$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At wha,)ov7q ja5 buzt frequency should )zu5,o7vajq bthe circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12./v7ghmxy 7njph7 n-if::gd o:f d(l8k0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitiviffkhdgl8h-:7/no:d 7g:xm 7ny( pv je 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 circsyvu4,*-mi uzo;p 8i y5mc nii aw/;g/uit 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 hasbv k+vvhesbcn) .1.2 v an impedance of 60 W and a resistance of 30 W. What is the power fvv+vc .h. bsv )nb1k2eactor?

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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 c)o 6vpmmm;)mtircuit containing a 50-W resistor, a 10-m) o vmmmp6;t)mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor 7 q8w4v 56ng 3n(ynrqd2rshkfand a 15-mH coil in series?rsq63v4nkrgf 7qhn8n 5w 2dy (

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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 q;331g5 h jj +ndcrzmhseries with a 4.7-mF capacitor for a resonant frequencmnj1z gh5;+3qcr3h j dy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor qtu 1mlw090 mxfor a resonant frequency of 1000 Hzu twxq0 ml01m9?

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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 l( k70ses q3czand a 40-mH coil if the resonant frequency of the circuit is to b0zs37 l(scekq e 1000 Hz?

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