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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxw;sg(8wol3x)z ar3b x:ds5s k 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 indug)d)po5 j4rt tction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produc 3a.wu(6 kzxbm *q(yuces what kind of change on the induced (w(k6acu*.q3x yzbmu $emf$, 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 t+wiupf09 j k2 vw25sl:w:mfmxhrough a loop of wire produces what kimf09fxlw 5kvu2:+ jiw :sm2wpnd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chan q k/uzb9h -3pz1bid,gge on the induced q pg3hbk, z1zdbi9/-u $emf$, 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 macxmz1l w; jkj,a6a -tq 0:m4dkgnetic 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,fa,/3( 8izb+h9hsh xe6*gh qe nsv u:m the direction of an induced current in a conductor will be th(v+bg6s f i,h39hxea*mu /:shez8nq hat 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 abo6tc rez: aj* n5g2mwz 0tp91uave its center with its north pole pointing down. The sc*6ma5ajz:rz9g 2et pt u n0w1tationary 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 magnet is held vi n/:8zg sps:above its center with its north pole poin /p:s: ig8nvzsting 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 t ds0tqw70,s 4wvzjlf*nzxjae))6 pw )able top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from pjsasxjve w, fql6*40) nz)t)wwd07z above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table toprijx/j q z g,,6wl2zs2 in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in thisj/ ,gszzxj2w2q,l6r i coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region wher9mlxen z3*uzyua +ka+3q w68e.rc 6wre the magnetic field points straight dow3eanya qzuek6r u9mz+3 w.l*rw8 cx+6n. The magnetic field disappears 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 carries an ever-incre-:p p(jzvq s b)1bcv52uhn8kuasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When :jqn5vcp 2( 1 bhzpk8s)bu-uv 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 p 5lx/ug+rwzmon4l77 (vrvsw 8ole entering first. As the north pole enters the wire, the induced current will be (as viewed from above)/+o 8wslrn l5xm(wv47gur7v z

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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 a +bvtp95x bl*dlu cr0znaev0 f.-:em5xis 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 ax0 bavxt+l:-dlrb 0e.f pnc5z*ve9 u5mis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ,oi7s4n86iamb 1 ppnt about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what atn68mboi p4s, i17npmust 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.xzrd(a1n 4 )1.y7capkhz9w kw
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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(6lw wznva-1an $emf$ 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 f-6+nr:j(kvsjd9el 7ikr0ocxield. 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)pj nf- )ac/ur,n42reo11ee le is moved northward at constant velocity through a mage/ alu er frecon 2-p1e41)n,jnetic 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 conibvy4fy49c rdhk h :9+stant 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 generatoswy(mzc6;a0uowe rhzi 4m 015r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 reve9( 6yjt) mdhuolutions each second. The frequency of thu9y(t)mjd h6 ee $emf$ 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 de48 v(;mhxnqtmu s)( lz5ci,pt vice used 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 devich )(g btrvlb/0e 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 more loops than thw: w*unxqe 5o5t dna.2e primary coil then it5wqu 5o.ent2 d: *wnxa is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than trdbk6pg d* ,0qry96(ux:uv u/4u ozpthe secondary coil thedqubv 0ruopx 4d6: gzk9t u6y* p/ur(,n 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 1njbt6hq9 4og c7ak4 wyua99 ypower 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 circul+:qrqreu9 e7nzt 7kx/d, p:lit,

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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 seriespzj(/2*degpdwz ljuh yca47jji * 42- to an ideal battery of constant terminal voltage. At the moment contact is made with the bpy guij74(h */c -2 jdzjw*e zjld4p2aattery, 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 ar:/i4b9 h1 s:dus +dpcbpnhuym1 h.ay6e connected in series to an ideal battery of constant terminal voltage. At the moment contacp:ns 9acbd ubshpimyu6 1hy:4+1 dh. /t 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 connecgt6r4 hwp) .efted 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 /kuvz-avdd5bi5 ( 7ll- i, yzhinductance 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 h 7- a9d ibtfil4d3emr3 u0.bmto a battery. The time constant for the circuit represents the time requirem -4fduld03rab b.imt 7 h39eid 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 55yp ch4:nlt -r96a+arq kmlxto a battery. The battery is suddenly m-xalklhpqa4y r5rnc56+9 :tremoved 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 have the sameiz +at6w*4r-gkc cue2 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. Ovytzfs2l:x e9.dyr 1 4o x:u+xn 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 supply. In this csuzuw-*4qts-n xne. j 3*yvv3ircuit, the curren-3wzjunt*s uxqyn3*ev .4v -st

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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 acu5q0txtn nfoh :(y3lf 6,vsu1 circuit changes by what factor when the frequency is o1xs5q0tyfn n vtu:36(,ulfh 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 inu1b 1u u0.wdufsst:4pductor is doubled, the inductive reactanpsu ud1.tb0u:4 wfus1ce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the induc ,m-0)g y 0s*bcamdxbltive reactance ml)0 *,0-bc xsamgydb 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 0 :wxu3tt.yy +0gtylxrzc.+p to an AC power supply. In this circuit, the currey.xrx c+.upt0 0ywtlz:3yt g+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 j9m)1zaxuv r lx9;qawh9f v b bln/-,;the frequency z;av1xx b ln)r,;9lum bjh9w9/-fvaqis 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 as99t3md( q)p4e q p6uck3:to -worvadpproaches zero, the capacitive reactance of that c)oq3m o4 qe9 ddctkv:a (t6s3rw pu9p-apacitor

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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 38 gxad:r4vdrthe voltages of the inductor and capacitor in a RLC series circuitrd48a3v:gdrx ?

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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 andk75bkfvrye))accr lq) : 3+m RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increas;agkc:qvb39tvu(azx, wq;kd-oq a,; es. When is t3;qdcaka; o;(a ,wgz u9-q:k,t qxbvvhis 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 k z yd*gev(hzl.csj-5dok648 impedance 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 circuek6 i8+la e8mnit. 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 capacitangdzxsx (4z n:75eoyl+ce both double in an LRC series circuit, the resonant ys+x(ze ox47d:5 gzln frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuitp+p:bhqh sm q 2z)p60y that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit og8rjc, i. bi+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 unindzxh7e4 ir(4r6w f8o form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo(rhie4n6r x zd 7w4f8oop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic i3 minu5h5ns:w l*d :qfield of 0.20 T. Find the magnetic flux through the loop when the plane of the lni w5 i l:53msnd:*quhoop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a un2u nxp +umj)q5iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the+nup2j uxm5)q plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is r .+isy8-sw p;3uistcre g,v q8educed 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 c3;bkdmd n9zi1hanges 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 tuijrg qhh :*tig, 3rz8e 4m39h3gs:giyrns of wire on a square frame with sides 18 cm. A uniform magnetic field re : h 83sry93hj3giggiqgimzh*4t: , is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arehj ugy1u5l 8* n(h6rgaa 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 /k- v*j op1pxs9;znwsand 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 2kt82o+wuvn(,cvyh9vpj0iu5 1bh o v where the downward component of the Earth's kv y022cu u9onbho51 ,(vhvj8 vtpi+ wmagnetic 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 3it6zjqs0reoset xerr:;di761 x0 3d velocity of 2.0 rad/s about a vertical axis through o0drsot x66eri;q:rd t73xisjeze0 3 1ne 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 cr iy-+u+y0 ;d7pg. mjtqiaslv+oss-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 3we5oqr74h7wi u*v jlld /l 9wturns 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 az***rin7 nossb5nq) cm long and 8 cm wide. The armature rotates at 1200 rpm )s zb*nri o q*n7ns5*aabout 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 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 oa*g+y c;hw na7f 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 constr-l2(om ezh 6m14jzxwh+ x :haruct a simple AC generator with an output of 12 V maximum when rotated at 601jo z4+whe hlamh6: xz-(rmx2 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a owlebf* (0is+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. The motor1;u6gtd a1huz.3w p tzjg4x.y.gnx8h 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 ov13a c pqts7m; po0gard7,. e r:x9hr6.00 W. The motor operates on 120raae ;o0ho : 7p,q.xg17p3sr rt vmcd9 V 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 internalsqxh 4io 9qn uvo(7m/l:wdr )0 resistance 6.0 W is connected to a 24-V power supply. The operating curre ()0ox7 rdoqqnwi9vhml s /u:4nt is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a:ghj, o49vgh7q ;loafys; 60 jbrz8ln 24-V power supply. The operatsohvongz48l gyjla6 ;;: q0hf, j97bring 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 power supply. T9ihewc2amu 8 *he oper u*emh ia2wc89ating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary6ep41q6eyny:l z7 mgn 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 prima 9cdw :yl/lia i.1zrq*ry of a transformer causes 14 A to flow in the secondary. How many 9/1iicdlw * a: q.zlryturns 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 turn5 )bpwj.w; okes are necessary in a 110-V primary if the 24-V secondary ha w)w5jekobp.; s 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 z e4;utodi p 8**sayz)of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, yoz)p;ut es*8*zad 4iwhat is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiehrtml 4q,7(.qu2+9rctz wdo ne.k(js ncy, how +(ort,rqu 2dn e (jktw hz9l4.7sm.cqmany amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transf4uj.ddn v f/si;bm0- iormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the d;mij/dsv b0f.u4ni- 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 a pwn*2wj j)+rw60v shund 300 turns on its secondary coil. If 120 V at 2.0 A is applied to 26r 0vuphw+jsw)*wjn 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 primary coil and 300b dl+u8vnrxn8. i b40ngs0(in+ ku3dp turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondsk +0in0n(xdru.g88 3b nipl dbuvn4+ary?

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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 ccz gm kg)cf;)k62qyo5c,x7az 4so-tsecondary has 200 turns. If the input current at the primary is 100 A, we can s cck,oxo;af4tyzm2k 7cz )6 g) qcg5-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 fs /)4m,dcmw lits secondary has 200 turns. If the input vol4)f,/d mwsmcltage 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 imx3hw0s g8qhay5 *q*uts secondary has 200 turns. If the power input to the primary is 100 W, we can expect wq *syumhhga5q 3x80* 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/d0-rk7( pud e2r xpvm 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 p7m0-/dd2ru( xepr vk 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 currez+sw eq:hr ; g9op+;zjnt 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 twhq +:9og r+ze;jspz;he 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. The voltage is us sfaqjt6y7)::l .sd k 4y-uoecually stepped up to 4500 V by a transformer and transmitted through a poweru4- q6 d7a.esosyyl)jft k c:: 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 kr 3rfh2 gqsb*2m long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating 2f 32*ghqr bsrof 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 lqr)b +unzsywg,3n *t; kv.9mc ong 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 trarzbk;c g vn)w +q,* n.ytu9s3mnsmission 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 much less-vs 1 .a6/rh lktf- (z8jzwwkr1gkh+z power would be lost if the power were transzhz-v+glf1r -(jt.wskhrw6 1k/ a8 kzmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is k2 b5kgmex5xl08;7.a4 gvsf6vobsj a/ bgax) to be transmitted on a line with resistance of 0.60 W. To what voltage must the generajxvg/ g s;. ab6kxa5a04o v7b5flbxe8sm2 g)ktor 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.: cw zz5cx+y7a0 A. How much energy is stored in the coil's magn7c:zzc5a x+yw etic 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 contaibj ecqc9a:ryr5::4u yns a 6.0-W resistor and an 18-H inductor. What is this circu c 4uyarbqyr:::5e9 cjit'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 voltam vu4 qs:wf3-q2)tuzz wzdc((ge in an AC circuit 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-V AC outnmb-0 2aj/1l yl0 piillet. 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 outlet. Wh4rtnoea-eqe 86:/ 7fl ,7ua hp rfe-sqat is the resistance of the lamp /a oqq8 ea-4frl e7es-t epr,:nufh67?

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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 t3i oiwv4.r362xev +wm g0xubps;ow, power supply. What is the peak current through the resiwx3 v+wp ix;m0w43or .tv6s2oui b,egstor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dissjb b(f 2pniyf1;gxk6fo169 qhipated in the resi objy n9hkpq1f26xbf;f1 g6(istor?

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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 res 6m -vm.*(nte i.gr7zd eyfn(kistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ran : ktl/4mbnna5f3gu 2u,;0* suuawuesistor 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 resistorm7 ylk3kj: yun53 m0qb 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 reactancurvofiaj9/ an8 ;z8s -e of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hkf :(bc +b vs08ixe)+ jguu/snz?

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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 p5rudehl*0l e ka( .jh:p4fd8 coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacta7x,dq wzfg8f rtzhg 2eov749 (nce 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 kHzcvy;a ;1o.eho is applied oavoh;1.;cey to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz rw5kxio;5)ik u-rmr7 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 reactx:s thn80 pbebp3t.fd 5/cn0p ance 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 10 kHz? nj5cnk z;31geekujatvd88r )mz*( b-

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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 reactance of 120jxmoxuj:3 l :40 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF c/;wk 7n hwo:nbapacitor be 100 W 7owk;n:b nh/w?

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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 0.0arbk88 q616i d 0jiryz010-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 uwa+ju ;*+p *bbiu)jh x7pw3ree*mn- circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c u huj3eipbx* ew)+ j7;r**m anb+p-wuapacitive 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 ff f1t/j(n+l vf,. ifdif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecitld ffff+/.(nv ,1f jted 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 coiligi,a0f o5l::k4am 7,zdfstv, and 1.0-mF capacitor are conkmof4 si, a7gz:i:vf, lta5d 0nected 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 20-0b5lbz to u7(ymH inductor, what is the impedanc l(057zbbouyt e 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 serielk(i5. pcz(y4wgbs * bs with a 20-mH inductor, what is the p*.y( i4l( zcbgk5sbpwhase 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 neede; oz-sn j 5u22,ybznxld in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impe2y; 5-uxsobzn n2,ljzdance 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 fx2kcgh9 cbrnd,*p vo7,a8rch9d:q : is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 cha9 vg9d87,dqrf,2*c c b n:xkhpor: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 se77h76;riugfpy/ e zloq)f6 cc ries with a 450-mH inductor at 5000 Hz for a total impedance 7fy hq7ug6zp cf;ic/er6) ol7of 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 puti;da pqqt (8cu1o2 k8*nx;er bf8/ xvk in series with a 100-kW resistor at 1.0-MHz for a total impdb (k 8vq ;*it/e;1rk8a fxnop8qxcu2edance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impebwr,ao e);s;n* wgj*j dance at;ewo*; swj,rb)g j *na 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 serie;ulh ye08*a6e,*dcteu* tv shs with a 10-mF capacitor at 1.0 kHz for a totalevc,se h*l;deyu h *a0t68 *ut impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed8s8yahi .,tqcx f 3z81 hhg9vk6govq 9 in series with a 10-mF capacitor at 1.0 kHz for a phase angle of 8c8sg 9vih3ht f qgxz869ykoq1. a,vh $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nemev 79ixqn ( lqkmj4hm8ni3avr typv)*0+n ;6eded in series with a 30-W resistor at 1.0 kHz for a total ev mq)43vmj7vin m96 r*;nh+ptax yl(n 0qki8impedance 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. Wa s9s n7wx +cy-:nsihi(:-fbs hat is the phase angsnbca7 :i syw(s x+f-n:-9ihs le?

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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; 0 c:tueoabzxtaq4hj1t cpd-e(a .7 ) V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriescaau )7e po.(qx4a cz h-td:t1jb t;0e?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF c6t8h*,xjf + azasdnd.apacitor, and a 0.350-H inductor. The circui*6.n8hd, f+as datxj zt 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 capac:1 (uu-l;ckwj2 nj tocitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What ckc :(ojwtnu1-2 c;j luurrent 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-Waj2 mqpj ll46o0n4sha4bf d22 resistor, a 10-mF capacitor, and a 0.45-H inductor, whejs44ab22fldo qa l 0 h2n4pmj6n 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-W resistor for a phase anglexad 5d 4izkt)2 ofk i2z5dd4xt a) $40^{\circ}$ 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 -x8y v67vd(s1zhibw-g::y e /qq iwr- mrng-j, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be :q1wyv r sr8z:xbi--g-vd /nq yeji6 whg(m-7 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 W resistance,y3+bji-j1xs g+ vn a.fvm vg3+ 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplynv+ fm+j-a.gi xg3+3 bvv 1jsy?

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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 circui/cy l/0r8hskz dlrul5. j9wpi qi -1v.t is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. W kjk2 w)57d d ,z:eja-llmzoq;hat is the ;lejmd,oj:dkw5 )-2lq kz7z apower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC cir++h.3s b mc/f1w-x rukvy9d bncuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powk-.r9d h3cn wuvs1 m/+fybxb+er 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 o8 y1lwr21;sym .z l /4cwmskekf a 1.0-mF capacitor and a 15-mH coil in series?/w2 lss y8w41m.;ezkrk1l myc

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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 seriebqwu/ro/2 frx8.b pq 2s with a 4.7-mF capacitor for a resonant frequency ofrf u 8w2q/o/.pbrqb 2x 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 forgkm9tm) 2w*sl+fv vkh5az : .m a resonant freque ahm:.5twgv*)f z9svl2k m+k mncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30bo-b dezc3d ((+is6c k-W resistor and a 40-mH coil if the ree6(os zi(b d kc3-dcb+sonant frequency of the circuit is to be 1000 Hz?

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