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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 followingc s(+7a.jwmgo are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that na:9f3xadg* fthe $emf$ 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 coinr9 pnt nal8r .ih4tef3g,j1/l produces what kind of change on the induce nt13lfr hngn /r tp.ij8ae4,9d $emf$, 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 yxer )pj.y,ttoq9t8ir 3l93p the magnetic field through a loop of wire produces what kind of cha3y9.xt9 ro pqe8pr )ijt3,tyl nge 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 diameterjo txta:- yw ,n+wga.6 of a loop of wire produces what kind of change on the induc: tg-,xw.tyo +a6nwj aed $emf$, 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 ma., fr, p:psfkj2 i.vbygnetic 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 indub -25d ffja 1hlwg9mw/ced current in a conductor will be that which tendgal-/wjmbh92w d5f1 fs 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 m+ vt56tsgr g i:n) kzyy+(u47gjf1 vfc ocr3e,agnet is held above its center with its north pole pointing down. The stationary magnet induces (wh+g 6,syf3ji v5:ynrr+4zg tuf7g tc(vok ce 1)en 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 ty2 +p-sjp/ znubkl- pg i0:l/hable. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the- pgp y/0pjzu/n2+ki -: lbhsl coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in ap ;/+nych.uj jw; uex-3 q ej5itm/jy+ region where the magnetic field vector points straight up. The magnetic field vanishes sudden/yumjux. j he-;e+cnyqw5p t;+ 3j ij/ly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vectnh*9f( *ubajgup.98u lp s8vfor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what sjfn 8u * 8b9u(a.h*vpuglfp9 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 top in a region where the magnetic h /awyu(( 0hbwfield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced curren(awhy0bwu /h( t 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-inc2 f)f:(hz lzeereasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current(z:ezfl) h fe2 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 firs9b u* zkch*xd(t. As the north pole enters the wire, the induc9 zx(bhc *kdu*ed 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 a5)8e6n y+1lxinbmxr,5t xnd v+ qdvp2ngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points st+d pv,)xn12nx imneq8d 5 l6 ryv5x+tbraight 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 rotated (3y t ,a+fykdjat constant angular speed about an axis whose direction can b+ yk3yf,( adtje 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 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.f7 x*pk5cxzesq5p ;j3
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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 thk1l ns sjgns:8ioc) (d *ey+/ gme4d5cat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Them0h a620d: n6b44z.bxpwobdsxlmx k - $emf$ 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 northwarddwftson j 6f+5/0yl 4d at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indu+loj4fdd n w ty5/0f6sced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angur .zi )p9mn*95 pihvbilar 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 generato8,. 4 gwxkymswr 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 9-km ouk)-thxtx q+q )op1i a7revolutions each second. The frequency of theq +xtx7-)kpk9hq-iuomt1o )a $emf$ 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 :3kbp3 inqo6syltt opf9ar/62p-- mj 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 that agcm2xymrp k4o3ab*jj - 8:g4

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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 loopz6 wtax9 +sx ny88ldx3s than the primary coil ty xts8x nl3+x8w9dz a6hen 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 mxbg72*zn /n5ss (1db gp aom5gore loops than the secondary coil then it is 2g7pn/ ambz*s(gds5go 1bx n5a

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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 inputo (dyksej2.b0mr (*nd:7*vhf bfcs1w

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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 circu8jpr1p:fz : 32eddf trit,

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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 conw:zg+ 0ohw*evqd3 f)c 0c3e lknected in series to an ideal battery of constant terminal voltage. At l)gedw 0c 3kvh :of0*w3czeq+the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal5;szedx sss0p /vuz;3 battery of constant terminal voltageps x;0z5devsu3zss/ ; . 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 u9z5u.8 *bym )vojzvo is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectiesxb21 7f (ps4q*ljoed 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 inductor5b u p4,xde1ga3p8hj b are connected in series to a battery. The time constant for the circuit represents the time required for the currened1j,pp3 gb 4hxua85b t 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 bp)0c1rb: wglcattery is suddenly removed from the circuit. The time constant for of the circuit repb1:wlgc 0)r cpresents 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 excepah mdquz4(x, +t:

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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 Af6 *b.t :y+ )dvlzbwvqC power supply. On 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 p9.(a ls wli(dzp: xzl+ k)fk4lryz7n cjvb9 )(ower supply. In this circuit, the currentc7.9+ )k a:w (bllzfpxlks)dlnyvir(j(4z9z

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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 ch0wssc a ;:zmf-anges by what factor when the frequency is ;0 -wacm:sszftripled?

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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 ,;rkvs0iyra7te tb )) doubled, the inductive reactance of that inductoist)rea70)r v, y ;tkbr

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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 volt*(tto4t+fb o hage across an inductor approaches zero, the inductivebt+o4ht(f*to reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,b:frb o m3wisb+8j4,c o9t *erh3 s6jt the currenjjoo3t:h*9b,4s38 csb f6bti+rre m wt

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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 circuc0 sa,b.wyok 6it changes by what factor when the frequency is tripleb 0wc6kas.oy, d?

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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 hs69hebd/,fl approaches zero, the capacitiv6 / 9felh,bdhse 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 inductor and cku8 8ql k8xm-t czztpv,.j/y5( ii2uz apacitor in a RLC series circi8-5,(mpujqc x it.2tzyv/ 8z 8kzl ukuit?

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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 de1k 4wnbpf b c,1z6gg kd2;i9z+r pffx1fined 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 c v-+ pyxv9queg 4psy+0ircuit increases if R increases. Whe +-+usygey4xvq09pvpn 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 impedan j3yrhu x+d3n dtredi 4s3r r*(9bq*a2ce 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. T ,ks-7r xtub+py88 dyqhe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in r gs f , -s/d-(rgtvc-j2t ks2lns) ysrrpq475an LRC series circuit, the resonant frequency of that y5tsv dr-c72 /24s tkg(qssrf,p-r-)nj sglrcircuit 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 dri8 u;-wu,jon44oy vnk xven 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 occurs zl9ohsqaax7//gv) ,*0 mmgf i 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 rotat y+m 8*g;/g ir5665 gbw3r bdzjoqdlrting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane tgb65jg/dyz rr3g;5idmbr +o86w * ql 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 ewb+zc f-gcwd q8 a0,u 08mz6r0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throughu8c e w -zf8gmd0,+qbczwa0r 6 the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiu0v ux7gwry7 t:s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whenv rt7 70uwgxy: 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 s*i o nch7mw55ocg t1*lingle 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 chasr5 5uysea)+y nges 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 turn rg j99 +377 hasmpxh:v:c+gt,ndytsvs 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 T to 0 in 8.0 s, find the ayg 3 dx p9svnshc 7 h9a+gtj:m:v+,r7tverage 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 ( l )tpqa; )h 90zw1hpeisfvc4area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and aqnv: s// z1pnj dw:q1crea $0.20 \; m^{2}$ 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 wherev+ rklrw09hf ,0c/6x4 0dc-foi+l xatrn, xhs the downward component of the Earth's magneticoh0f hx kwrlsx4xn0rc,0al+ + ,-f9idrtc/6v 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 constant6i50/lskiob 8w clhxkqr 4 1un(ku05p angular velocity of p8oh(isc4lk01u0q i 5bul wk6 rk 5/xn2.0 rad/s about a 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 and a cross-sectional areur-prh )5njojdb t439a 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 (n znerk;8;wwof 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. 2xif3msx , eso8+p3djpa2-jl Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axism3x-eosdix,8ajl j pf 3 +2s2p 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 j wu))p1my(n lda j um5*,1 lpfcmlhqm-9o*6qof 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 comfda+k2x 7 -bonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rbk fdm x-7a+2ootating 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 gen r2l; 0dog ;fo mxnl(/2eykgu2erator 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 resistansa*i h98x2w ,zklqtz0ce 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. Thqc9 m6iwj(n e9e motor operates on 120 V mie qc6n j99w(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 power supply. ,z3 kuqg brd;m/me*b0l3l mr6 The operating current is 1.0 A. What is the start0mm33zd 6*;k,/l ulqbremrgb-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 Wk :(j m75*ja;v1fc dbz:r8m e r1p.vzbeail;r is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thefcv : a;r rbm8p1*d.i7:be;(e5jv1arzzj ml k 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 cooz/sp h(ewt 3w(j 1kcf v8qnph n+:9s:nnected to a 24-V power supply. The operating current is 1.0 A at full spech/pse8f n hs + n(:vt9jw1 kz(ow3:qped. 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 rd0mc ++lr5e3a f- o x njftv: ,rcppoh9zg89u(educe 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 (r.0p3lpkm di ;w ax1otx2t(m14 A to flow in the secondary. How many turns are in the seconkdp mo0x.w (l ;mr2xp t(ta3i1dary?

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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 manbu8bf1(63 u5be5b/tsc7 euz(ill( n jmaahc* y turns are necessary in a 110-V primary if the 24-V secondary (7u(mjauc8/bcs 5l tub*51ebfb3a h n ie(6zl 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-turn primary c d1l6hc-t.fbw oil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the f l.-ch61wdtbcurrent 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% effisdg b9dnu7bdu9: 1l) r; utbk+ciency, how many amps at 71:; t b9ugdb9rlnsd+ dkbu)u24 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 transfai8:ha )xm48 m iji+fzormer provides 7500 V at 10.0 mA. The primary coil m4m xiji88fi: h+)aazoperates on 120 V. What 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 6fa2wz q+n)ec80 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage iaz eq)cfn+82 ws 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 pr b egc-;gs4(zzm(unl2 imary coil and 300 turns on its secondary coil. If m; -lzune2b4s gc(z(g 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 transformer has 100 turns and its secondary has 200 )v kfrb,re5xdx6v 8-vturns. If x, 8b5k)rrvdfev6x v- the input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 29brb1k2 -yefxe)o(xt j v.cip3pp5;n 00 turns. If the input voltage to thntxcr. pxfby-bvj( 3eik192p p)5oe; e 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 o 0zs: n-c8rzeturns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect then-z:c zre s8o0 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 usually ste*a)jxg tk 8yu.pped up to 4500 V by a transformer and transmitted through a power linkyugx) * t.aj8e of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is us-,e vt55;enmji( *ka3 mxmd kcj 4jg5sually stepped up to 4500 V by a 5 ejk,s(5mm3imn x5jd kt-g*jae4 c;vtransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V.wqbfphp ,y gg*i+rym);59q c7 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 transmission line ifhqf*5cg+p gwq brmp), i9;7 yy 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 i c41ikp ilgu.za.3nork(f) ( 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 100:1. What percentage of the original energy would be lost if the transformer were not pgu( .4zkn1c(i ar3 kli.)iofused?

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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 k.i2f7led6+ysoc gq /nuty8: ep(l 1g. 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 q+7gpt(e 6 oldiy :sy8n efc/k2u1gl.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 1 bpk.xkt z 1dyk1e2,rline at 1000 V. How much less power would be lost if the power were transmitted at 3000 kxd.k ,bkt 21pye11zrV 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 to be transmitted on a lixr yls-l0 jj:)ne with resistance of 0.60 W. To what voltage mxyl0l:jr-j s )ust 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. How much energy is stored in the cvw8j(kyd f1b l -3jyrzt164hn oil's magnetic11 86-v h3b tynjd(lk wf4yrzj field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6sz),dq dj )4fbys;mk) nptz,fqq* x:3.0-W resistor and an 18-H inductor. What is this circuit's time constantdmkz4b nzq;qs js, qp)*f):dy) ,3fxt?

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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 cyu ze 6rpau,5/ircuit 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 plac8* e:vz6civ peed into a 120-V 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 120-V AC outlet. What is the resista:rhtga) 65jvfnce of the lav)jt h5:f6 argmp?

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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 sup88f7yclt x5x9wnhln375rz hi ply. What is the peak current through the re 3f7xwh nltz9c8 h87xl5y ir5nsistor?

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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 a3 ) srs8yk;;vf2 bityw 120-V ac power supply. What is the power dissiyrfiy8b) 3s;k2 w;svtpated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r2ob0 /1oyzisa esistor 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-Wpsebb,kvl30 (,d eb+s 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 resistorz rs, ks0 lk,ljv o-q 5edpia4)5+hw87mybi+ z 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 induct/w) uju6 lybd/or 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 ckoz3;d(-qvd 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 will3e)s4sc5i; slpqins ,g wm.l1 a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1zat t)z3.s-rn 5pcip.lkme / )000 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 frequencyf(ty4 o. mz(by of 20 kHz is applied to itbm(tzy( . yf4o?

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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 jpfi3hi 133:sj/3x svoy0 ssdthrough 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 reactzel-v9w4zco+1 gp h9 cance 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?r2( :k312zh lzfyv ktq

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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 capac 1 zpl 1pyjeh*2lv3)gfitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of2 m 00hlu-colu a 0.010-mF capacitor be 100 W?l0c0mhu - luo2

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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 a9/,tjnfq ,kkmcbox7, 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 seyk hsbxavzy;wd4f2)m*1z-vzy ;y +q1 ries circuit with 12.0 W resistance, 15.0 W inductive reactance, ay;s ahv v11 y)+ dq*zz-z42ykywb x;mfnd 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, iuisuxw5s/n /6a0* yk20-mH coil, and 1.0-mF cap /u6swaus5ni0 ixk*y /acitor 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 x7q2zo h+nl/j coil, and 1.0-mF capacitor are connected in serzjoqxl2/+h n7ies?

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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 q 8qe1 ;g+;xtbwmg7qcgpk3(s in series with a 20-mH inductor, what is the impedance at egqgwk3+ 71 ;m;psqtbg8x(c q1000 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 i.(8wfpw0l-lj wmxp *8xdp1i cn series with a 20-mH inductor, what is the phcwxdp *(ilm.l 0wjfw xp-8p 18ase 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 seriesqyq;3hg40e( :vsemsw circuit with a 20-mH coil and 1.0-mF capacitor (q 3qyge4w;vse 0m:sh for a total 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 in serierbkib,wv91 ,y9ir)qt s with a 100-W resistor and 15-mH coil to get a total i w r vitbb99k1,yr,iq)mpedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mck1anr,5 bze 9H inductor at 5000 Hz for a total impedance of 40000 ea 95 1znrkcb,W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 98ypl)yjsj*0d(i rr v s :*dhx1yk+gy100-kW resistor at 1.0-MHz for a total impedance o+1j)*ypyrks8lvy9ysdgj* (r hd i :x 0f 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 im,g oyb 1;erck.2b3 xfspedance at 1000 Hz? obr3kgs ,yec2;b.f1x

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need hm)1zm0idz(dxn dv8/tge2pn 0zde 3 .ed in series with a 10-mF capacitor at 1.0 kHz for a total impedancedxedmdp)vz z h/0e0n2m8.1 i( zd3 gnt 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 with a 10-mF capacitor at 1.0 kHz z9wx f(dzrd /dm4+ga3 for a phas a r(9wd3zd4+zmf/dgxe angle 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 for a tota)ve1 fw/mo)p y)t- zpfl impedanyw1mfo))zvt) p -p/efce 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 k pnzgt:qfs6i 75.3rp120 Hz. What is the phase angle?pg 37z:n i.5pskfr t6q

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resb8cci qa sja)j(r))1y4sn2 lvistor, 20-mH coil, and 1.0-mF capacitor are connected in s1)qrj2 vy a)4ns bcljsa(ci8)eries?

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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:fjlltlg6*6 y-mF capacitor, and a 0.350-H i : yl6ltl*6jgfnductor. The 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 30 W, and an indupnvq zy a;6 jf5lk8p:d7; j*oactor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current f 6p8vn7*y a 5zkaqpo:jlj;;dflows 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 cz ubddl94+wey9 cc* 9qircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indd 49b9duc ez*cqwly +9uctor, 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 necesb;ssy3g3g8n 3 ymjf; lsary in series with a 500-W resistor for a phase angle o3;3 gsgfy byl8s3j nm;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 4b3+ncj 8b:fcf-z lup= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order tcnlb 8f:fz+ bpjc u-43o 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 circq kimh 5tnh551uit with 12.0 W resistance, 15.0 W ih5ni ktm5h5 q1nductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circur8i4 *z x2wawxit 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 imp0j*5 g kwn+nrhedance of 60 W and a resistance of 30 W. What is the power facwjnh5rg+*0 kn tor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contain 4g/ky2qiu81wj7zh e jing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power 2ej qj7ihuw8g1y kz/4 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 coid8lb1g u uonxc(p.*h5l in series?u1x.c unh8b*d(p5glo

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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 c .vhcmy ,ewrjg62(g;a 4.7-mF capacitor for a resonant frequency of 10g hy2 mv;(,r.cgcjw6e kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a res9tzo jfg+ 8 znrf-j6u;iz0f 9monant frequenftonirj9 +fz0;89fugmj z- z6 cy 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 ru p45 wkwr--xa 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 u4p-wxr- k5rwHz?

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