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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic.p ;2 ceuf1dzl 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 j1, t /0aqaork*v y((uaamo7 xstates 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 prpmsd ):ju 91gpoduces what kind of change on the induced 9mgjup1s)pd : $emf$, 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 produces wha1sze 27 wiwv(i5xs3cat kind of c z5cvw31xwa es7 (ii2shange 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 wivm6;jb p if4 biarztn :4m+p)8re produces what kind of change on the induce4rm +) 4np:tzb8;mvi6iapj bfd $emf$, 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 9s7). dioxaw m+hkz*a0 guzxd(qi 54ra magnetic 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 an induced cuqqgkfehzj;9*5 n 570p n yti5 q7c+tmkrrent in a conductor will be that which tends to pr+inq*hnqk;0p5qjkez9m gf75 t c75yt oduce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontyp 2va)h16vs gm-j: ddal table. A bar magnet is held above its centejgd-)vpv m:h1sda 62 yr with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar ma9p )p)h7d*vbf x tq-6xccfm 8ngnet is held above its center with its north pol))n6pxfx*f m8qc c-79hp b dtve 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 ascxd r,f/4 n8hclva,1 mimi. : table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense o:va,.msl4,rmf1i/c d hni c8xf the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiq+0 tzg-ji6 s u*p-u9du, tqqteld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current i6sudt i -qz,utpj ug+9-0qq t*n 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 horizonts3v-ud1ejl g6t:g pa *al table top in a region where the magnetic field points straight down. The magnetic field digugjds a 3t:v6p-e1l*sappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carriz6fk:dglxu (g ,c1,v. x)f ukmes an ever-increasing current northward. Two c,l fk6. dgxv1(mcx) ufg ,z:kuoils of wire lie flat on the 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 north pole entering first. e wzv-c;o rv,/;enrlf p r8f+.As the north pole enters the wire, the /;rvclrro-nf vp., efw8;z e+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 a4cok5.imnu r6g q-,nf ngular speed about an axis whose direction can be varied. Irufig54.6mq -, k nnocn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated14 qfx)*aa 6v z.ffzhv at constant angular speed about an axis whose direction can be varied6hzfx*avzqa1f .v 4)f. 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 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.tywt12iq *vid k+hd*)zi9fa(
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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 pwvw ji),un0 kz l6 u0e8xg7,uthat 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 magneticu)zw nqh(obe:+fvxxi)3aj9) 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 the east-west direction) r7o3.p0 v z8s lf(vqn,lf6zqbis moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentif.svqf3 8zo bvnp7rl(lz0q,6al 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 br 41sb 3bee+ncar 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 generator trans zcy:pv+t:,t ar l e+8or2im3lforms

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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 9o ,:mkaaku/r4hms 8t second. The frequency of them4tark,a 9k hs ou/8:m $emf$ 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 ush:0gj ;w2 x ad0d2ockmed 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 dznka dwt5d1.:k j8 +g7vxgn 1uevice 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 coil contains morea; yp 4ziszlx26 */uqd loops than the primary coil then z us4y z2;l/apid*6xq 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 imi56 a ocvz7c- s5j4ocoil contains more loops than the secondary coil thei4sooz a55-mcc7i6v jn it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp: kb0h/(ls 5(1tao6y flimnhl ut

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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 resona, z; gfhrd1dwgg+h/d 4ts wg8)nt 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 connected in series to an ideal*m w:m 8l4fyqt battery of constant terminal voltage. At the moment contact is made with the battery, ly4:qmt wf8 m*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 batte)fx m3wj(bgs xl:reg*u8;nn1 ry of constant termin ;gns* 1:x8 fmu3gw)(jbxe rlnal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R ipb wh.o3ya*6as 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 inductan3kqst1 7wffdk8 k6l /r0ryuuw 0h1q0d ce 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 battery. The time contgo 2yh,+-p sjstant for -2,t+j hspygothe circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery i3yvtgb1q rx9kn+u:j ) s suddenly removed from the circuit. The time constant for of the circuit represents the txrg qkb+1) vyju9:tn3 ime 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 same unik),0etum: nue ts 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 cirv*pv,p7 rarp(u8; )j (inpxje ak3:tqcuit, 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 conneh4kuid8/jg n r0w+s4fm e6i/a cted to an AC power supply. In this circuit, the currenri48+/4wn 6d fmj hg au/0eiskt

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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 y k4h2,,mlxux ac circuit changes by what factor when the frequench ,,xlyx24u kmy 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 across an inductor is douggm8ye3u (zwe 6z)nc-bled, the inductive reactance ogcn em 6wy)z z8-(eg3uf 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 ther1svydd9i(; m l-7tcr AC voltage across an inductor approaches zero, the inductive reactance o7tv dr d9icrsl1(m y;-f 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 an5kzkf0t-goa 6cpy cc* :y-ew: AC power supply. In this circuit, the curreyyw p:*ecgtc-a f6k - 5kco:z0nt

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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 changk prnh3+i c38)vllv z8-:iyvwes by what factor when the frequencvlikvwi-ry8z3hpv)+ : 8n3c ly 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, thec(5 yu i;ei8qs capacitive reactanceq;y8ie(u cs5i of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capac, nos*: u4n-dwzq2lcsitor in a uw*c nnlszdo2- q4:, sRLC 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 defined as i-z e o7 li6-.p7*lmlzyqyub2qo31f y$\cos M = R/Z$, 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 i9:c zaotx q:e32 ho vw8rmw.n-mpedance of the circuit increases if R increases. z-3 8x.oohavct:wq: nr9 2wme When 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 impznfvp63t:+f 7tmhy8h edance 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 circuit. The impedancecyw) v;td ebub g):+ +no8jaq* of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doublesk8tzp j.t(n7 in an LRC series circuit, the resonant freq (.t7zk pj8nstuency 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.jcv s,ssl2g lje .q2)qn.d ,u; 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 occurs o- em7wei8ssc00t ng-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 ,5-knqi tgpfd2t(l 9t0.20 T. Find the magnetic flu-(ttqdi2 kgptf 59n,l x 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 unxz)j8uzqltn wj/8 i)9 iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne/wn8)i jq9t) uj lz8xztic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic f./y cjbpkub :/nef9 +xield of 0.20 T. Fibupc :kj+/.9ne fby/xnd 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 sin2)k s3l*ttrq-h/mga*s )j8 jyl u 2fkxgle 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 ji,op ap rj9ooz 7stch80s1u,w*1:e o changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns oh/*e mak1bng:6+dwj 4fp. gerf wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular toheeg 6b1 kd+f*w4/pnj.: grma the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and n8 jw e4k7vx vajz1(g7tw;tyl6ub2 x9 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 /g98bf rnv(bq x e+9yuand 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 span of 60 mcedf7 v;iol:/ lr/xa 5 flies horizontally at a location where the downward component of theexfl5r/i :aloc/; v7d 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 isdp9 k9y.qpqnm7o1 vk 2 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one ofkopm2q1 pnd. y9k9v q7 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 ve.*edzpwws*nz.:1cw( tx r 2 loops and a cross-sectional 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 of area4-gsuz dwyql3e1h 32i $0.090 \; m^{2}$ 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 armaturqlomg.t7 j.fj au zc48p68 aa. (gj6vke. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what wial j.a m.8go64qjukf.6 p zj8ag7(tvcll 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 wirx4r5 +ci*zs hwp9zr .od*(syte 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 an output ofq me:q-rg(y.e(,lgzib8 n4 bm 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available.ny bz:qg4 -e8r,gq.lme(ib(m 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 wixx )cd-0nu9fzth 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 mot*dh4(8 ic bkwlor have a resistance 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 W. The motor oper 2 i zmbg kr;.jspf)brg(gnyxd czn-v5 -38b33ates on 120 V AC, and when;fnz3rcb. 2 pbrv83kg5jx(s -i 3zn)y-mg dgb running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powe.ms pwm6z lavl13 j6n3r supply. The operating current is 1.la3vps16j3mn6 l mz w.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 resistance 6.0 W is conneswq +)vd4 tn8pcted to a 24-V power supply. The operating s n+8pqwv d4t)current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powerql/mqwbv:u8ck/ ;y u)p js0wp.v ;x5t supply. The operating current is 1.0 A at full speedx.;;ktjp8v:5/c b)0mq/yv wlw spqu u. 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 neede c ,k*daacsfylfd l kc)er (*b /:yd.lz52(h/td to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformeyaq6jem5s+ 9+nle c8y r causes 14 A to flow in the secondary. How many turn8eqn c +lye 6+a59symjs 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 necessary in a 110-V primary if the 24-V c5y4z9vr hmvxo61gd - secondary has 1my1v9- 5 rg6chox dzv400 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 pr1nslwzs po,rt +*1 rj.imary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, 1p,s st+jnrr*o zwl.1 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 primnyxbxwme yu9y4 bt,w -4ed6j,qh9 39 vary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the sey wx 4ntey4w9j39,vd-9by m,hx6buq econdary?

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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. g *hfimu8i:a /The primary coil operates on 120 V. What dog ai/8huf:im*es the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnyb:bdvm. lo86 x5 5-q;winy rhs on its secondary coil. If 120 V a5v yq5: xb-ibl.o8;6mh nywrd t 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its *bh(u wyeap d0k 9eo73primary coil and 300 turns on its secondary coil. If 1*akbo3ew9p7ud ye0( h20 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transf035i jlrcp0):h nz uo j *n)mmqmi2,ejormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at tnm ,r:u ci05 m0)i3olpqzn*j 2hj e)mjhe 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 andi f2(ek8 *jc/ggv zmt( its secondary has 200 turns. If the inpu8m gtkzj*(g ef /icv(2t 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 transformermv)gfmwi,7jfv*gbiz8 y:4g9+w ne3g0iha 3 p has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (igp,+g0 i 3myf 8gjnegfbhz:)43w m7v*v9 a wineglecting 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. 1cnz o-)ab)ft; y ,ys5nb *jlwwjo,9r 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 number of turns in th;j w,o* nlf)zjn 5tobra,cywsy) 9-b 1e secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage icim*eepk ; lysgwjx/;l5. v02s 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 l.*p x/kscmlyv5 ;e0;jwie gl2 ost 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. Thed t:.pqv7:iqe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0qiv: qd pet.:7 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 05lbq2bwo kd,v8q k(:xr 4acg5.60 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 original energy would be lost if the transformer were not,oq5 54 a8gxkkcqb dlb r:v2(w 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 of 0.60 W. A gent,0a -av6-u4 pl ;lnj6iva* kg0k*v otwi/wpaerator produces 100 V at 70 A. In order to reduce energy loss due to ht,-a /knj*pagv-vu ato l;0ki6viawwl*064 p eating 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 6-W line at 1000 V. How much2 ,a)uzrp /m06noonwl less power would be lost if the power were tr nupzr6nw2m 0/ ol),aoansmitted 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. a4fmzlz s79o-r9rurzas +9 f, It is to be transmitted on a line with resisl 9 a-a,7+o9s4mzfzrusrr9f z tance 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 to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A.+m4 0ht87ypj p ojak8m How much energy is stored in the coil's magnetic fiel0jkhp p8o7t a+mm4j8 yd?

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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 inw3n x0spu ,f xgk0z8omcv01m9ductor. What is this 38vu mzwm p, xn9f1g0o0cx0kscircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where th vq qseikzzc2wi7d07669rw7a e 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.2g.xd4 dlp.wpuq6 8gy What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC t7k;c07 j ;ka f,rgi nh3rosvb;wv5x1outlet. What is the resistance of the lamp ;3 h5vkc; r ,v70ixbj7awfo; grt1kns?

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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 suvw2b57o3yf.w (dzp i wgm9 ;mepply. What is the peak current through the resistoz5m y72pb9 iwwmo;.dge3w ( vfr?

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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 connecthi2kg3/jy ckut5 ce:5t.zww +ed to a 120-V ac power supply. What is the power dissipated in the resistorkz/ jc+ 23kyuce5 5t. wtiw:hg?

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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 imuace qjau*:1;7- oqp/i ph.hs $I = 0.80 \sin (240 t)$. 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-;p: pf n:h y1xp4v0bqjW 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-Wi-s hidirvxd)(,nb:h61-z wz resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH q8xuas yy6h /23vunbz/*,tohinductor 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 of a 2.50-mH coil at 10yq3uf1q/.o tb8 jh 4ry00 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 induc s54 8s n( o.kb6m,) nxqwlvlzmvy53ijtive 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 inductvv z2ylrm 4 3o;a4mtg1ive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz ii 7a. y/z nq:i)kcrrwy9*t c5hs app hrrn.7 yaitcz5iqw/9 )cky:*lied 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 t,n37o tj /z3mmk6 k ykbtkj*s2c,a (lehrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reacs;-y qpv ck,y(tance 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 reactance at l0 *x6ouvf xw.*jkvm /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 ck 0dhhfmy9 kek +3au2*q-h k-wapacitor 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 capacitiv +s6ndl4uj: zze reactance of a 0.010-mF capacitor be 100 W?:46+lnzus d jz

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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 cigty,y;v 1 5x. txtnj7apacitor 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 1*jollqa+.m sje pg8grx/ 6b.*2.0 W resistance, 15.0 W inductive reactance, and 10.0 W..gjxmejls p*l or/q+*6b8 ag 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 resdd 5;bf;71oiwgft3 j6 k5jqt sistor, 20-mH coil, and 1.0-mF cap73 gkodff5 jtqbds;; i 16tw5jacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coiv4q f8 nk7kih1l, and 1.0-mF capacitor are connected in sf78nv4 qk ki1heries?

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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 asl pz(32/.nj mae g;iis connected in series with a 20-mH inductor, what is the impedance at 1000 Hz?mil3gzp ; n.je/s(2aa

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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 inductorpp;,+ w:6mud5bdrccpx0 )e i z, what is the phasr6mx0c ; +ipc:d) 5dpw,bpzeue 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 yz.vd t,5jrurcs(80a3e :fttseries circuit with a 20-mH coil and 1.0-mF capacitor for a cr a,zert0 d3tu . :jsvty8(5ftotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed uz ez7kg.pe-4in series with a 100-W resistor and 15-mH coil to get a total impedance of epekgz 47-.uz 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 45d .lqzcpcrjx)+l l+u*. s)op1 0-mH inductor at 5000 Hz for a total im)o l)rcclluq*sd xz+.1jp+ . ppedance 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 skkw 4 ozqg vgt77fqg(-*ar,.beries with a 100-kW resistor at 1.0-MHz for a total impedance of 1507r bfq-g gkvtg47 z,qoak(.*w 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 seriesvf6wnt)p. 9(5qqp7s 0t gl tky with a 20-mF capacitor. What is the impedan75 vsqtk)ft gw 0pyn9t6p.(l qce 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 needed in series with a 10-mF capacitor at 1.0 kHzfgluh03hp a* : for a total impedance of ug h3* a:p0fhl45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ca5rc d ,hqip +i81fpt7.uhx.nxpacitor at 1.0 kHz for a phase angux58 rphqhx n.fdp ,t+.1ii7 cle 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 1.0 kHz a pz,1t3qib0fomvdeq 6o/ 9)kfor a total impk3d9vmqtqz e )i1,fo6/ ab0 opedance 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 capacit5bwwtub3 xh+ i, 0k.,f/os s0pa xc4txor at 120 Hz. What is the phafb.,05 h/ a0x+ 3pxtbxic ksuwt4w,sose 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-Wml5to0 e; jy)m resistor, 20-mH coil, and 1.0-mF capacitor are lyj)ot0m m ;5econnected 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 w-bn37yqx(hnci8fv 4 7dl eh).0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cirn-l (qh4bei 7n)fw8yxv 73dhc cuit?

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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 cav (5+lz jyqgh7ae8n0rg 2y+a 9mrve/vpacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circu7av+8gj0/q m la yrhv95v+ryz(n2 egeit?

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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 contath,9 sk6awfa 5jk6l t/ining a 50-W resistor, a 10-mF capacitor, kj6a/lha w56,9ksf tt and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500;n*tzgo- on6q-W resistor for a phase angle of zon -tg6;*onq$40^{\circ}$ 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. Anj6zdqf;yt4 xb,gyt/ . 3n xa7m2 c(krt what frequency shouz/t7 tg( 2ycbn34 6dxy,.xfmn;qr kajld the 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 out6gg8jmquj 5ck .zc*r1 put in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W8 6m*jcru5gcg qzk.j 1 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 circs29xgxf4-5zawm p e9 ruit 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;c4g4fnq i,a 8*wux/;b bgcc b 60 W and a resistance of 30 W. What is the power facti anb/* bc4qb4;cggu,; xw8cfor?

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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 f qee8)kbq7v;g or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whkebq7 gq);e 8ven 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 fre9vt4ref 4+ /n v d07ylkbri1yzquency of a 1.0-mF capacitor and a 15-mH coil in series?4e9i0ry4tnf ly 7+/bvd vzk1r

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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 o 5w t+fld(ke1u/lq 0f4.7-mF capacitor for a resonant frequency of 10 q1f5u (klftl 0eo/ +wdkHz?

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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 ayb4 oq2bw -(ui7x6ueo 3.7-mH inductor for a resonant frequency of 1000 7b ib6w xu y-e2qou(o4Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor muste7yn w7/1hxnpls2+q k/8srw c be placed in series with a 30-W resistor and a 40-mH coil if the res wpx+k 2q r1ln7 /sy87ehscn/wonant frequency of the circuit is to be 1000 Hz?

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