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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 g.ph(qv 8vq9z6hytu; u. f3:dbmbfj, 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 states thpdfsxi+p)7.f at 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 )i63sh-g.rayzg xc o.r0ol5-u cd/wywire in a coil produces what kind of change on the dir5 6ch/0ay)-ow3y-ro .xclzs ug . ginduced $emf$, 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 prodof )pkxy :i9w6eq .(lwuces what kind of change on the induc) ( 6 wypw:exklif9oq.ed $emf$, 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 whati un/9uu 7iu7bow8v*im/p4mc kind of change on the induu*8i9m i uc/ wonu47imp/v7buced $emf$, 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 magnetic2ftgw4 huoe-gx81 lt 6 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 current in a cohd+dd7 yy l8thm1d,x o8os4,ynductor will d,hdo yto7y1,d8h 48l ys +xmdbe that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab .:)glnz. h,iee cuqg0sd*d9d ove its centern c s0dziled,.:h *)q9e ggdu. 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:85,gazc irdaypog6,t 09d:g kwg+f A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, thdic: gtg+ay agw:5k,o0z, dfr agp689e 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 regiozp5tmj25lcmhih gb6- d8 qb:tx 4wb+*n where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of gt:+ 6q d8twx5hmzbh*b ji2pbm45cl-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 w22-/y ttsfa. .6(gvtmbdede where the magnetic field vector pointsm/6fb 2t ds 2 a(dg-.ywtvte.e straight 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 horizontal table topkcyjp(ui( q++ in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abov+kj +u (qypci(e, 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 lcm6d)wlo6r( kg+ nj5na zzf+8ies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the jz8 +)g6+mco(ar5zn fnkdwl6 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 wiru2 qm+44ebqbpe with the north pole entering first. As the north po4 epqqb42m+b ule enters the wire, 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 angular speed about an a0fmbk ).i.a.m n jmh: +tq7wiyxis whose direction can be varied. In a region .7i:.tab+mwj mk.f0minq)h y 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/7pwbk9j5mifm, c o t8 rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the inducedo97c,bwt/if5j mk8 mp $emf$ 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.vig1r9*qoj r 3
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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 ay(n.j(is s4z pn $emf$ 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. The hu7v1q)2uiup $emf$ 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 northward amubxo41j 8)ib t constant mbx48 1 )bjuoivelocity through a magnetic field that 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 consfn,r8k(x80o cr9t p3k e 3ym;6zkdvamtant 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 tra1xuuxq -)l/o sve 7xy8unrm j7z31 ,omnsforms

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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 thro e1 h)7t2d6vazkyv,d nugh 60 revolutions each second. The frequency of the hnv6 d,a)y1z2 dk 7tve$emf$ 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 e5: mqxk48sij 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 device 8;v uxkg lsg89that

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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 conggyhu * .(m e d4iees46 5t(nq(la;urotains more loops than the primary coiloy;g((eq h(rim g tu4ae l5.de46u *ns then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains 4rdzhyb 139asp4z 9gx-b6i nzmore loops than the secondary coil yzb rz is34hx b919p-ag6z4nd then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the p(kxd5tc,:n2a 2leupi ower 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 resonantb7zu21jnu u 4m 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 ind(:y.w qexo8 sg j2y 0o+jgn8sluctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact igow(soy+jes nqx: g.yj0 8l82s 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 serix3 ipm5f1zetpw *xn+/es to an ideal battery of constant terminal vof wx/p1*ze 3m n+xpit5ltage. 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 is connected t2 5rd3giwo/ xa+mer 1ck+zi.to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an 5ncn eeg+z,ew/ h g-(m$emf$. 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 batte,-asri-b jeh3 ry. The time constant ei -3 sb-rha,jfor the 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. Thh)mn mkd.a vq8g8djd6)-:vrn;gz w 5 xe battery is suddenly removed from the circuit. The time constant for of zxahdr68 g m:n;5wnkv8q)vj-d.dgm) 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 have the same units except trunrk5*y pu ;o,cv/;l(nul,j1b 4as:

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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. Onn4fn*(ofidhv n vc/ 4;ujo(5 l this 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 supplyn1pqpc0,pv)w . In this circuit, the currentppn w pc,q0v)1

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes 9tro0 +;qm dn,ksv/ddby what factor when the frequency is tri+ 0krqdvdo9,n tms/; dpled?

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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 doubled3v/ot frp v27qw4/kjr, the inductive reactance of that induct2v rj3frv4qtw p/ 7/okor

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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 2fewo0-q3/m(b j jq/dvxjy(t approaches zero, the inductive rf 0(-y txm/qjqdbv e2(jjw 3o/eactance 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 o3r zu9c15q0n4kuef a circuit, the current5 4uc0e9u oafq3z 1krn

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactatz 87390 g szk)xz ww2/kdotrrnce in an ac circuit changes by what factor when the frequency io0xk2 gw7w )r zdz9srk/zt83 ts 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 b*,e8xcv, icq/t/tnwa capacitor approaches zero, the capacitiv*wqci ,/,nc xvbt/te8e reactance 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 ind 05.ztrxa1us6ht2sq g6st o1fz(i3 jluctor and capacitor in a RLC series cir(t x l2utsosz56 1j 1afr6qh.gs0 tiz3cuit?

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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 dehf)d4xb 1xn qw cr51es84o h;dfined 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.aqw -nb+kc6a5 The impedance of the circuit increases if R increases. When is this statemena5c+n 6-bqwka t true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases xx.aimi 4h,6i 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 impedance of the circuit increa6f f69x0jjml3b7qv u3mf:z 7tirkk 6y ses 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 double in an LRC series circuit, tgnhq m xr;3a97he resonant fh q9ng;r7 a3mxrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonancjuv89 /eh3ic oe,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie4yyng 4 ;r lfum5u :8sxc0h:g)dxk)q ws RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ma-4-rhbgl2p v e )3lnytgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vev-2rlt-4y blng)p h3ector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic ichv/pnml* nk.7v1y7field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectorp7/knc1 ilnv hv.m *7y 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 mamg)f 0cp6 8tnbgnyky8 fo*65y o h3kt:gnetic field of 0.20 T. Find the magnetic 80:f6k8)ycng f5 bmo*g3kn6py ttohy 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 siav27+ljjgi( um - i/b tr:hg*qngle 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 en0u5 z ddon6*7to8qs d7bjyfd7 3 *aqfrom $4.0 \times 10^{-5} \; Wb$ 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 ( :)ycw y/m7zo: pd67khg mptnturns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 Tc7h ztpk:mmw :n6oyp)yg (7/ d 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 an5 pdgugszccq.mlx;/m 4 c /nl( -ei0x3 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 i6y/4l3j -u6l chqry eand 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 m flies horizontally at a location wheixt3i;)7 )k yq2 gvq0kahwni)re the downward component of t32na0yti )v) q)ixhkwqi;k7ghe Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular 3vznkn/cxys+ 3ako 66velocity of 2.0 rad/s about a y+s /no 6zxv33kkn6ac vertical axis through 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 ag6b h9lz7 *w1mya bu(pnd 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 tw+*yh xkr7(-k1qce 7jmev mj/ f7vqv3urns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 8qmro 0t;7lxd wr4 w5xcm 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, whalr5mox wt;wqx04 r78dt 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 n*umagk( n+53r php s.l0.ajx 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to cons.; tt(5 vf sg-kjw4uxttruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availt(tkfvsg j4x;uw t-.5able. 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 generato9a 9ce 8; 65:lvu0.0tr ebjslkgkuscmr 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. T+zuv37wbvk d; he 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 motolf:v8 a8 1b*f j)szqczr operates on 120 V cs q:81zfz v8jal )bf*AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V p*owiihq:o*12kmnf8 a v3: ajmower supply. The operating current is 1.0 A. akj ofvi:2q:183im ** wahmon 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 resistdsyup+3s:jp + a 8q4k*ixcw:iance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What iss :iw *kiyq48j3: a+ p+dsupcx 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 ix2,b+zjir .j6.0 W is connected to a 24-V power supply. The opera+2,.brzjx j iiting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is( 2e:ts n6bbak needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flowibyp1avo t -hz, a;a*3 in the secondary. How many turns are in the secon* ab-3aozyvp1i,;ha tdary?

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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 are8gr 2x0 unh9g0:sqsnr necessary in a 110-V primary if the 24-V seconhrr:xn09gg02ss8 q nudary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500- h9nz6ehzb0.p0w jbh7 turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is th0 hh07z pjh .b9zn6webe current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effiwaiehk 8+diwz20*l4 b ciency, how many amps at 24 V can flow in the secon+ ih*lidb2wk840zw eadary?

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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.4j )7k-k.w uyxg)xj )wbo5ino The primary coil operates on 120 V. Wha7xu g)xoj)5kwk 4)jonb.-yiw t does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil ankink:rhk,g.2w/1 n tjman0 0qd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what .hrq1km2ijtka0,nnkw g 0/n: 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 primaj6msm6ogkw*v u8 q 7x5ry coil and 300 turns on its secondary coil. Ifsojmg*x 5v6 wk 7qm86u 120 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 trans6k(f a 47 rufhjg oohs1jf/;ah*we8* aformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we c7 hf*r g6ejh hao1*uws4;jaa kf8/(foan 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 secogu we 9z,bq84oecu giqv)1+v.ndary has 200 turns. If the input voltage to the primare+1e. vuuqb wov8,9i )z4 cgqgy 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 trans u7 lh2gx,dsa0former has 100 turns and its secondary has 200 turns. If the power input to the primary i,a d702sxhg lus 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualyosnwh: d 8fe .k8a04 u2lp8wq8fh)q xly 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 the secondary if the primary hash yw s2 4:qenqfhdolp0fau8x w.)k 888 200 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 ccb*t7kxll1 y4 urrent at 120 V. 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 percentage power lost in the tr1btclyx47 *k lansmission 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 cu;wd( ktgr)b7q rrent at 120 V. The voltage is usually stepped up to 4500 bg kdt; (7)rqwV by a transformer 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 loq:pz)nka8 vd(/.h mx tjn:5m rng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1dnx tqj8krmazvm(hp5 ::) ./n. 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 no 2.pd he bimzt9-6v6total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heaz6otbhie 2np v9m6d.-ting 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 1./lbkw :z0h 73chszy m000 V. How much less power would be lost if the pohw3hz/:zk 70.mbys lcwer were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It isz9w: 71l 3-.iwi qqq)kgpd4x1 rup zll to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the originlqzi317 : plquzdk-)qwp 9wxglr 4i .1al 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 carriet(at p2eih2 u8s a current of 5.0 A. How much energy is stored in the coil's magnetic fiuh22tti e(p 8aeld?

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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 resist.nh9quo pzdsqp ;s4:) or and an 18-H inductor. What is this co9usqn :d.p)h4 s qpz;ircuit'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 circui0 lpcc6c//f f 8lzi+kz +91iwxmwd hs*t where 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-Vq 5b dpy9nlf3f1/vn +h AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a - 1t4ck4wp3fk ijxd ;w)k*ujc 120-V AC outlet. What is the resistance of the lam)x tcd;fc wp1wk -44*uj kjki3p?

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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 po3 gqa, cygg/,q a;9vsirj9th-wer supply. What is the peak current through the resist9j9t3ag a/ggvy-s,r c ,qi;h qor?

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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 z,-cbi 0 7lidfri0uc) power supply. What is the power dissipated in thclu fiir-zc,d70bi)0 e resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-2/ 1 w,,immviofrs3 dtW resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wm d3hs g2h8ua1juh51h49 v;tprnud 2o 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 resistor ise:*x szp8yb5fajs33;qp )zq8n1u r y r6incv / $I = 0.80 \sin (240 t)$. 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 inducto:: m5t7 qr enlpz-nr*tr 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 coih k 8 .:bcm8v kccstef2lc)ru oa0-r1*f gw3e4l at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil haq-p7 dmrd*7c vve 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 inducen y( ic/ ,vk1o r83nf-c( mest+y;xshtive 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 6 ; ( fygmogjzz(*l1poAC at a frequency of 20 kHz is applied to itg;jl1mofzzp6(o yg( *?

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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 110w4 th a5o p/vd2v2rm*b-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capar-fvm q8* j:zm1+ch4e nmh c(vcitor 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 ez5xdse 33:y/qk-ikd to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactan jcaok0k5cb u 6 ,as;rd;a o/.e zh2;)4mlqhnbce 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 cap(q3 vx (o5(nf cj/6yr lfpzr508 opzjxacitive reactance of a 0.010-mF capacitor be 100 Wo frrcxjfzyl/35p (v n0 5(xo j86z(qp?

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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 throughv c 6x5v97./jszloitc a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resista64o-x4 buev nund*i h8nce, 15.0 W inductienib4 -xh8du* v64nouve 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 resi6qjbtxjtdk15/u4 m qqmo.8( m stor, 20-mH coil, and 1.0-mF capacitor areu t1qom /8x.m(jqkbjq5m d4t6 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 1+n9 nu 0/ de i(1rvnrfef.gtq0500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c. fd0nv9gnqer+ (0/rneu tif 1onnected 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 ivn4 eaxfiy;x15 q8uyj 80d;xin series with a 20-mH inductor, what is the impedance at 1000 H1y; f58yx0;dxijx n qia8e4 uvz?

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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 induc36-onw c hev8ku g.dapw)-9dptor, what is the pha3 u-gd p.wock8w69a)-de hvnp se 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 1.0-mF .ee99- reakvkcapacitor for a total-k.r9kaee ve9 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 nea5,1bc gchos6t wn0;aeded in series with a 100-W resistor and 15-mH coil to get a tota5s;w 6tga0bnhacc 1o, l 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 wi:; gvhxrp+;h pux5z2xth a 450-mH inductor at 5000 Hz for a total impedance of 4 zphv x:pgx;+h52r ;xu0000 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 3pz.vsz:u9;in xc v5deg j6-i a 100-kW resistor at 1.0-MHz for a totalpns-e g9: uzvxzi d65c.iv; j3 impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series witi7 / vk(:)c rlnqtnkt0h a 20-mF capacitor. What is the impedance at 1000 Hnkn: 0vttil/(7k) rq cz?

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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 1 ca+mcplt.sc/z0 : .ig0-mF capacitor at 1.0 kHz for a total imsc:l ipz ta0+cc /.g.mpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series witfuc+1g000c6uj oh6 t - tcuaosh a 10-mF capacitor at 1.0 kHz for a phase anglo0a66-0h cuf gj0ous+cu t1ct 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 serie7 7g/wjjgzm q;s with a 30-W resistor at 1.0 kHz for a total impedance wqjmg ;z g77j/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 at 120 Hz. What is the phavd u2fcg.q; ) c69tmklse angle)qg; 9cck.ld 6m ftu2v?

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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-W3 ehtjm50l6kr6*fyd4ac hg( u :ax5 xz resistor, 20-mH coil, and 1.0-mF6l(4hc*xdk ejz5: ay06mx5 g3fh arut 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 of a 100-W resistmstc+7 ftingf7 ;tek79:gat ,or, a 10.0-mF capacitor, and a 0.350-H inductor. The ic:k9f 77,gst;tat7em f ntg+circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 3 :hegw4yo49vn 0 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. W:wy94g neo v4hhat 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 containing a 50-W resistor, abcwwf0xo :k1 + 10-mF capacitor, and a 0.4w wxk0o+1cb:f5-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 serieqh4ww3 z2b9urqnbt k n01*6tl s with a 500-W resistor for a phase angle o 1r9z*2uk0q6w3bt4wn nbt lqh f $40^{\circ}$ 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 = 1ahz*,rx diu (z+7azsn,1eli +0.0 mF. At what frequency shouldzl*(,+uzhies+ ,rna17 a zx di 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 output in an ac series circuit with 12.0 W8u+;ww rkeoj 4pdv 17k resistance, 15.0 W inductive reactance, and1o v+; re84pjdkw7ukw 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit i c,dw. q/u-.lq z9tawbs $63^{\circ}$. 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 impedan /iv;q-iogva bczp;i5ayi/:0 ce of 60 W and a resistance of 30 W. What is the po-:5 pb;i 0 /vaacgiioy zv;iq/wer 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 .b0 ,vxc8aj cin 3c.czseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wz3,cn v0 8bx.cic .jcahen connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seri9fx usn8))nz 5ulj zxo-a9ofm/ zkkb9:a 7re9es?buozfajsknl) oe-a /9x9 957: z8uznf9 xm)kr

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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 capacic:ur2ee b/ j,ktor for a resonant frequenk/j, r 2ub:ceecy 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 indg*u.erfi -eyn3fv4g6t 2,nhmuctor for a resonant frequency of 1000 Hziyfeu- 2v,.t6f mrggh en3*n 4?

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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 naas*0w 5awh33p.l:b c ek6afwith a 30-W resistor and a 40-mH coil if the resonant frequency of the c30k fen6:paaha5 ww *3a.bcls ircuit is to be 1000 Hz?

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