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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 ard,g,45jojjt tm c/d h;e 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 dk*vrg c-pdugdy. 9.*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 produces what kind of b zzg4 sb2 jnk(d:sle 31yb*e61zc)hkchange on the induceb3j kz6e1ylszb d b gkch)e:s1nz (42*d $emf$, 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 wiro-;c)lpagl *s e produces what kind of)as-pc ol ;l*g 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 changjtof7 - p8y;mcn-5dtse on the indujf ntm8-cp;-dt57os y ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fieymbbq 0lf58i.i+0fepld 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 directio)nc( sm-ud/st1t 7r6f6k tsk mn of an induced current in a conductor will be that which tend/(t c7)ksmu6f 61 kdr-tst nmss 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 i,h bw9qowh(b,/iqho6 )v 83cx:iqqv as held above its center with its north pq3q) h9o,o xba: w /6qih(8vchbvwq,iole 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 g skfl7 kd* l:b/q7(9nvhkti5horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coildf k*k9/ vi hlb7lnq(t5:g7sk , the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the:s cyr5 yh1gfemuq8( 3 magnetic field vector points straight up. The magnet5efrc1yqu( ygsm 8h3:ic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic f3x s5ff+ae (qfield vector points straight up. The magna(sq5f3f+ xf eetic 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 top in a region where the magnetic h lqfpn 0m(-g6field points straight down. The magnetp 0lmqfn6-h( gic 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 li40tgf4i:7n /0rmcs)i um yvones on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the t iv/frct4nmoi) gn 4 s7u0:ym0able, 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-r ++fw mb7lds a loop of wire with the north pole entering first. As the north pole enters the wire, the bl wd7m-+rs +finduced 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 roueu)gx( 7 sja,tated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fie7(ue,x gsa)u jld 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 rotated at constant angular speed about an axis whoeavvn r at2*grvfda/1)e m))+4m 7 hvyse direction can be varied. In a re )d/))r t7rav2ey1m4h aanv*vg+vefm gion 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.t qklf/pevh;*/ch/-o8r y. pd
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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 tha 96v .rbdw-rnxkx2o4a t 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. ;j, -e(2qvb o 0 ygjw1fcwgqc0The $emf$ 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 a ,0uvphg :oj) 2a6fuvit constant velocity through a ugf0a):j ovu2 ivph,6 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 constant angular velocis 33gcsor .mdm.p:*;yub r/uvty $\omega$ 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 tran v9h83;4wfgex m4ny zssforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each ho ;5kx*i* oipsecond. The frequency of the** ;ikxhpi oo5 $emf$ 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 devi1w le4tj7 o0,ayj q94sw0opdshx-v1h ce 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 de7/uisvvz(*pm pvvsb,hxh rc grp8/ q-*q l8 1;vice 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:yqb sp,-7hmw -zt ya1 coil contains more loops than the primary coil thqayb s-ywmt7p ,h-z1:en 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 mre3t :fkmv *tb1) p+z 3bww/gjore loops than the secondary coil z1)wbpk*+/vfmtbg3:w3rjte 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 po8u9cm9 ozy7d 2rdugo5x(io s7wer 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 cirkgjz96 4zjw2 i4rgv5a fil-kpz+z9s 6cuit,

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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 are6+rpnwjih/ e85rng2n connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bg82j h6n+/r en5pnriw attery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batt n4z ljoy6ue;4:ges/tdq4hv ,ery of constant tnq64glov;:dj,4ey se tu4/ hzerminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with ) v) gm.fga0cviy-*6.w oamkoinductance 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 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 resistancebelp/yjxv u) g: ;2ei+ R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time yoxdwo1w8*; 9d1izgw1wmhm, constant for the circuit represents the time required for the current to readog; 9md*m1,zwyx1h 8iwo1 wwch

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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. Th yu1o,.gcx ke1e battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fuk,yo.1gce x 1or 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 sagq/ka-ngi. ,k09nfgy)gxr 1q mj4a +l me 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 aqf5skok19hj: *t ui 0wmy*5b to an AC 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 power supply. In this circuit, the curix2i-ybv nb9 /rent- iibx9yb/v2 n

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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 b;t7l6c : n2aaicr-*m arpd5f qy what factor when the frequency is tripled i-ranr :f cp;5aqt2* l6acd7m?

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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 acroqp 7cjjerv) a 24q)ng(ss an inductor is doubled, the inductive reactance o2verj7n(gcq )q jp4 )af 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 zero1o+zk.f5 rt30n-s tmv.tktm x, the inductive reactance of that co-tv t1.3tkkmnx 5fm t0ozsr.+il

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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 circult2-jur)kcg*xk( 8x lx.e30-yqg0 g*ry bk q xit, the currej3y- gu-8l*0xtk xkgq*b)(e0r lkqc x.yrxg 2nt

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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 ch. j;azc4 7d9 ua:1g/ei4uxccdhu jq2hanges by what factor when the frequejqaau x;u:gudhj7z94 c e hc/12 idc4.ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appwwoauif/k 5j*)m0a 3 hroaches zero, the capacitive reactance of5/a)ua0how *fij3k w m 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 tlk l sl,2w)8ok wt3hv-he inductor and capacitor in a RLC seriwh)sk2l - t l38olvwk,es circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circui we;qk4w qek6k;ii; y;t 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 circuiy -rg)1jyn,b8;dko/bjpp -rfh)ln0v8 rj t 4et increases if R increases. When is this nyopk hgd fj,8ltj0r/brb-4))ypr- e 8;j1nvstatement 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. Tb0z0foz/mu u7 imp:; the 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 circuit. The impedance ofqwg fo 5s:4 x-1r ;-q+ykfumbc 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 bot(pnkcsok7x4 4h double in an LRC series circuit, the resonant frequency of that ckocx n( 4p47ksircuit 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. Axxu ic2 3 .7/8dzxpdkgt 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 occu)bej9nz( v3 :t; q)pc 4zsuyrurs 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 rotatinfg) ;gs e6q8 9veihpi;g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the;);8 f pvh6igeq9sge i loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m itdp :e(*l1yr s91chsvs rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are v * tsrpl1 se:hcd1(9yperpendicular.

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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 uni( 4aamvgfwhq s80*)j6o rc7i9ikk3tcform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o*(c 4cq0vsgw hma8rki3iko769j )af tf 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 ofcau63-g y3gutb, 1gw/1fs wkl an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from p26s:vse0frag8 2 vm, v21zhpimoj c4$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squa,xw (v;xpmyj :+tl (b0nuwrr 1re 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.tbwxymw:0 rr1(( np vj+, ulx;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 aa/mzpxu 7 u9cuye m2j9,jhk0)cin t59 rea 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 arqc7khclpy3 ak7 pklh mt-.kmw0 fqw3b047x. 0ea $0.20 \; m^{2}$ 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 spa +gkv2xbjyyqf)p ;/ pf,c:w;rn of 60 m flies horizontally at a location where the downward component ofw rf +:yf vb;pp2xyj);, ck/gq the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant g 5,a 3osd)gneangular velocity of 2.0 rad/s abo5aeg),sn3odg ut 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 crossmwk(khbw3c bw +c7 :g yip o)pk)h;69a-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 10mr-f *0qa: vss;k8fde 0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on bv m.p-x5:9ko (spp01 xkwq2x q-ke kpits armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this pv1x q .ek-wko09q 2- xkb5p:pm(skpxgenerator?

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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 ofp i,- cz2:)a0eqev( vf rdthk8luh) y. 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 construct a simple AC generator with an2 .h;e:i 6vt-mq7;7i n3ue tizhbriuq 1bhu*o output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating eq hii oh2q;-6:.z7htvt u73i*n1mbu rubie;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 genmauq5 g1hkkb 5 yn9pqxf;4 +b4erator 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. 4tkz)b*e3mxwsfa+ obr 2pb-400 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 mov9l* -nigoy5o hn.l(x/ek;ud)8og lntor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates nl x (g;kll9he8uvin.n-* god y) /5ooa 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 resieh rga+4mz++jlh oo8za i2 i27stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is tho 42aag2 h+ iheojrzmi7+8lz+e 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 at;ax 5 p1cae6l 24-V power supply. The operating current is 1.0 A at full speed. What iaeap 1t;c6lx5s 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 tox )xb c4z92jggnb(8u8qay6 t g a 24-V power supply. The operating current is 1. (g2z8j)c8 6 tn49gqaxxbbugy 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 py2:s +z da6gu06xqfbdrimary 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 flijz8xi0xa( 3 6ppkpp8- r .hzqow in the secondary. How many turns are in the 0zh6rp.apxx8p-zqp(ij 38 k isecondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prijiob glalx2) o0 5t41c)b b6dvfjj..qmary if the 24-V secondary has 100 turn 61 bl0b.j.joj5b locq4xgtv)fd)2a is?

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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 co66o nvfse;sr.xoh4ie9f:s v e/p,7lr il and a 2000-turn secondary coil. If the current infroof / :h.en6xvsr4sei9pv76s;e ,l the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% ef9eb(4s e+ sv+kp;gx aaficiency, h +bvpsa4eskge ;a9(+ xow many 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 sjh1jv0/if wo,ign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drj fhjo,wi 0v1/aw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turvlsa6;0t 4ur jl56 -an.pk qgiu i2lc/ns on its secondary coil. If 120 V at 2.0 A is applied to the primag qi6k -rs0/5l 2pl tlia6;vnuj.uc4ary, 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 onm6yz s3spy- 1s its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in t1z-3 yspss my6he 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 tufxw--43mshl- xwtp9 crns. If the input curren sww-tx3xcf4p-hml9-t 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 itswd45c y chzzv1xx9 424ya t,qm secondary has 200 turns. If the input voltt2c 4x4dawc9vy myhzzx,45 q1 age to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tlocgspu;h6 dx8h+ 7k 9urns. If the power gsd97op+hxuc k6h l8;input to the primary is 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 usulv;oz4n)hg- xally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find t-g4v l;)ohnxz he 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 usunk9w5h u 3 a+ ,7c)qegtezmzl/ally stepped up to 4500 V by a transformer and transmitted through a power line of tohm q7 z,ea3/9l+tuk zc e)n5wgtal 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. The voltage is usu h4hn18ovh(1 uzpxk4eally stepped up to 4500 V by a transformer and trahnx hp48 4uo1 1e(hkzvnsmitted 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 livulsgy ixg* gni. ud,v6 ri:,:fddxv:;82 fs3ne 50 km long has a total resistance of 0.60 W. A generator producengii;vgi :xf8d 6gvs : luduv2x yrsf, 3d.:*,s 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 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 lonc , g,dsxhr18qg has a total resistance of 0.60 W. A generator produces 100 , ,sq8hcdrx 1gV at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powe7iu f4zd)( oslduzl9 ;r would be lost if the power were transmitted at i;97u lo4sf uzd(dl)z3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. yg6fn /:jxoo 5It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformg o5:y6n xofj/er 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 Ajycx7b:(7y*p bbd fu +. How much energy is stored in the coil's magnetic fbyb7*dbuy(fp7c:+ x jield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-Hq *j*,b +uw(lxg3c l5k wj0bpx inductor. What is this ci p35k bwbxlx q*+0,j (*lujwgcrcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rmdt 5y*++e mgmys voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?;/, quol:xf6i1pel 7+azf1lro2scmr

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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 i+lgou4l5e4p*7,rjmvkw6/4w . kikjwmun 8s os the resistance of the lar6m u7i4knkvo+ j4l8/ww5 l ukj ,s.gm4e*owpmp?

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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 supplye3 /1dky1rhy)1kdn sz . What is the peak current through the resistk z3 nds)/111r ekhdyyor?

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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 powerv0frpr46h( lhbc/f2h supply. What is the power dissipated c hhr60b4(hr/pvff2 lin 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 resistowkg/ pin 9 ,z;u.k4ronr 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-Wdl .r ;e6+h eg8h v+tlf2:odha 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 5 /s:tf,ybuo8o0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0osctn((zk 9my520ay ad8.rubus 52c q -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 enz) / j95hsghiwr8 7m2.50-mH coil 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 1*nr 836keukhn4.0-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 nece9cq ym il3;egk (blppng9y :,0ssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC atw5fjj m:, qf:z a frequency of 20 kHz is applied to it?m :wffjz j,:q5

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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 o) wtq1 dvxs52nh j*iyxqk. 8ckm2z0: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 reactance of a 4.7-mF capadh.h ,6dzu 86+xtl ezm-5jze zo1 /jkgcitor 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 104kz x bekm7pj8c ds6twp0xicy98+,-d 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 reac0*: nfbltra38 uetb+x ;uhx:vtance 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 of a 0.010-mF capacitor bsebs n34nf26bmp3j ie w0m(t (e 100 W?t(niem3m0p 32j(6e f w4bbssn

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 6az xt+ pd(uo ab;,jom,bu v2(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 o * )yxd8ebhu:jf an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W ca*hbd ux): j8yepacitive 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 Hqy2 t51a *(1xhgx o/am8t rfpgz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor agxmx8phot y(*12fgr tq 5a/1a re 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 resi ct*v.x33bk( qsa fxe0stor, 20-mH coil, and 1.0-mF csbqtv a0(*c33.efxk xapacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induqz m. 3iot*ft)l0s9d(nazb t(ctor, what is the impedo0 )bnzlt (*mqd.3zfi ts9ta( ance 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 connectedooe.c85in: 2e8nsah1aaao /6i n2 up b in series with a 20-mH inductor, what is the phase angle at 10ac6aa2ipnoe2bn s ni8h1 5ou8/eo .a: 00 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-oqutc*/xmr* 39d)my fz lk5: t+mnkd,mH coil and 1.0-mF capacitor for a total impedance of 100 W f d/dolxm:r9z)n,kyum5qk+* mt3c*t 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)b99c gxxk /gczf :am6 in series with a 100-W resistor and 15-mH coil to get a total impedance og m zk):x6c9xg /c9bfaf 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 must6: jm7fnc6y/hp s wjq6 be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 400n fsw/766 cy:mqp6jhj00 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 bze xwxu5w d0x 0(idl5(e put in series with a 100-kW resistor at 1.0-MHz for a total impedance uxdwil0x(e05xw z d5(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 capaci42 rb.g jcma87lc8utnc7 k t3d g1cto4tor. What is the impedance at 100udor7 t3 7jt288m.ctg c nkcca414 bgl0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series wihe6 r4j* i1r(hd ljmg*th a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W4e h(hl*r id 1rj6g*mj?

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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 a4p p.ooikxud u m)86x(y/ :ewp 10-mF capacitor at 1.0 kHz for a phase angle :k /oe8(xx oyui.4)pu mwdpp6of $40^{\circ}$?

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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 retc (w/x1fdlh3blt85 m,q9 d qpsistor at 1.0 kHz for a total impedance (q, c/q8tp1lxthdmf5 w3bl 9dof 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 seriaa) )4xewmw v53b.9d i;qbyrhes with a 100-mF capacitor at 120 Hz. What is the phase an)wyqbd9;b aa im3 h)e4 xvwr.5gle?

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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 resistor, 20-mH coil, and 1.v77uo .wf6cb c0-mF ca6of.7ccwbv 7upacitor 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 resistor, a 10.0-mF capacitor, an6+,hmx k .)rg7a qksp,wo+si hd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply.+6,.pa+mog7ih w)ks x,rhskq 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 inductor p,l w2c ca0rf3,xifi/of inductive reactance 30 W are connected in series to a fc/, 2l r,3aiwifp0cx110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 5w;i 1)r:ne q0y3a .zhep lndo23fxn/o 0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6 d n3i.y/): nne0e f;a3xhorqloz 2w1p0-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 phase0uqjre2y0j*h angle of 0r 2u*q yj0ehj$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mFr9u(hi7( r xwl. At what frequency should the circuit be driven in order to have maximum power transfe(rrlwiu 7hx (9rred 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 cilo1e89nng4 eg rcuit with 12.0 W resistance, 15.0 W inducten g 4gen91ol8ive 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 em /iu* wtodf.q1qrun5//lp5 zr22c fAC circuit 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 resis5ratkbeeq-1 m2 s)* gjtance of 30 W. What is the power factorks eqtje*)51br2 -mag ?

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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 fo *u+svx7zb(r-sxh: usr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductoh:bv+xu(r7z s *-sxsur, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capac /epa3adgbw 1;itor and a 15-mH coil in series? 3dwg1;/ba ape

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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 capacitor dkz6 *;+wypo:zy*il pf 0zxq+for a resonant frequen ky ozdy 0*: p+lxizwpf+6q*;zcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for *xqjw,sa8so + a resonant frequency of 1000 Ho s*sjq+,x a8wz?

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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 se6 +6f mjb5qeji p/bpx,ries with a 30-W resistor and a 40-mH coil if the resonant frequency of the cirx5bifpm6be6+ , pqjj/cuit is to be 1000 Hz?

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