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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 9xij2ztgbu) p4zcor ;t)0 z*umagnetic 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 stz:raf b y,9x6xates 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 change on-ssvw g gx:8f ;kn;urm:-4 lfd the ink:l8 fwndvf-s-gr;mxs 4;: ugduced $emf$, 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 wz bf)sa6d v0mmytvx) :0d. l;bire produces what kind of c bdlv60bmsf xt:z0.)a;dm y) vhange 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 wiyv7z +ur. 1p zsjb.z3lre produces what kind of change on the induc.+1p 3z7s .ljzyrvzubed $emf$, 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 cixr3v0h lkn fs.y2x ., j0il3from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curqp q;3f94tovf n -vvh5rent in a conductor will be toqvtf3h;-5vp 4vq f9n 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. Awjf*d3d7r9x p bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (wj*d937r fwdxphen 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. Akx:cmknyx,24tu.q ,a g4avk; bar magnet is held above itsk tqka4gnymuv,4;:xxak 2,.c center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table toe 4-vi3.4llytc.kvg lp in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. Wh4lie.k4-yvg lvt cl3.en 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 thz;tv9hy )lkh , pn8rl. jdi1;oe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direcht p ;1.vkdh ,lo8j inyzl;9r)tion 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 tav z8i8zql82e42jfc iv ble top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from2vzqi4zve i8 cjl8 f82 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 horizod(kt *na x*m7f,hh1c1m0 zym*vlw-yhntal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wireavhmyl 7h1c hmdmt *ykf-z*w,n(x 1 0*. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pol;dqdw c9z:iko yl 32:je entering first. As the north pole enters the wire, the induced cc2i ywqjzo::;3l 9ddkurrent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular s9gy +7o9k9cfn p7bksh peed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dohng sb7kok9c f99 7y+pwn, 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 g h/d6sc2z2 uug hj-m h51lu,pconstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be th c, p6zu52dluhg 1mshj 2-/uhge 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.e mrb (*j+ ,m1-tftdha
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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 thady9-n/lvx,c) 2ez x bqt 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. hzb;o;(s;re hThe $emf$ 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 movedjc2wzx-vy34k4, (c0 bee)pgb5 k aku g northward at constant velocity) 3puvee , k5w4kcazk4(-0gbgxcj 2 by through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a couh-ycz *j s-(wb ,vd8snstant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfo oa)rwb(no90n rms

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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 throughbp*qd*9b5fq4 st 0z jl 60 revolutions each second. The frequency of theql5 j *94 fb0pdzbsqt* $emf$ 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 mf i2b0z miyit 8 j8.cu(zep,;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 devg6; /f (ewit(lkjore:4c bia 0ice 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 loopkx0ebf*. * ,:qkuhhve5 b yxyy.1idz0s than the primary coi*kx .y bu: dz0v1f, .ebhqh0 5iye*kyxl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if v;qcr:dvya*lqz3t9 npj5n83the primary coil contains more loops than the secondary coildz y n33ntr:*; 5jal8qv pvc9q 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 power inzem1.r ci5xn68ah ij3put

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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 circuit. dj0,7 tu/p-dzkl/o8j bpu hh,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series l8n, 9fbp ljp5to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltanp, fp5b9llj8ge 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-l rrc3dlllbdt: r 8/6 an ideal battery of constant terminal voltage. At the moment contact is made d 3/t8rlc-r: ll6 brdlwith 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 connec) u1x jm6nop4/a0qim bted 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 gi z/j nbdg0g-;2ad:tL and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batt)hd xbp8wd6pd cy,x lr)ad1 m 0 dr;c9dx2i67rery. The time constant bxwyd6mx7d8)cd rr rc9a ,xlp idh)p ;d12d60 for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batteryqsv u*if gze0xo(q444 hv5 u0b. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for theqfog05sveqzu4b( 04v xuhi4* 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 une 5tgh5 v6rf7kits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the ow wn7 ,)vz6pn/fzn d,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 suprr ;orfjgflpz ;1774/phde w)ply. In this circuit, the curren4 p; fw re /dro;z)1gj7fp7hrlt

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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 by what factor when the frequepn9gw.c/tma1derx 1x: w f 8;zncy is triplxm98fax.wdz 1 t;p /wnc1er:ged?

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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*tyo3/ f2 ti+3g8ii:caua gil across an inductor is doubled, the inductive reactance of that inductytl *a/ g+o3i uii32tf8ig ac:or

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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 ahsjux 0f*vnzvaposm l0.9jb8:.+a k*n inductor approaches zero, the inductive reazf:0b un9 0*j .jkmas*l8px+ oasvvh.ctance 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 a;iu98 xcnz)2awxg97iqza m b,n AC power supply. In this circuit, the currentu ;c ixi82z ab)wg ,7mqnx9a9z

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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*0ihxf8ugxcvu, 2jb) 2z df/bfp-cg 8 circuit changes by what factor when the frequency is trb2v - g,x8hb*/8ic du0 pf2 uzfjcgx)fipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capahfty7n q.i,42dt at d)citivna),tqth i7dt2y4.dfe 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 capacitor in a w1hku/ j(w ;essk8r , uap.pumo9lx)*RLC serxrkw.9 1ep *hks8 )ow( /uu;uj psma,lies 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 cirkd,2x)r z)eg +s5sqzgqq7 8kb cuit 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/wlqdi: x6jiol c x,-mvy2s4 qv2lpna613 oe4 R increases. When is ti oy- 4l6ve2xa o1/w4 cvq3qplx:ji2d6nlms,his 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 impedance of the circuia n6.z(j+knbv(fwhclzp sd6xa4;rc 0y -9; wot 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 seriem / l9wlndnbcx(jpld56v g3 9(r k4ec(s circuit. 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 capacitance both doub)i11wmp8)b z9 vr sc8 zuo3ujsle in an LRC series circuit, the resonant freque9m1 jwzzpu 8s ir13)ocs)b8uv ncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonanw.hf62mjm : d,qzu .qgynb a)*w6e;na ce,

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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 ciryd qv,rze47 ,miul ugzw330(bcuit 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 gm ov ,n;k(rb:4quet2 a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thm,rk;v2ug4:bno (e qte 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 n6o5zli nj6j 10.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopil61o 6j5nzjn 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 i gv hj:gs0 wc)cw1(1eyn 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 at an angle ofjswhwg 1 0g)(eyc:v1 c $30^{\circ}$.

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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 shulo ;(hu3ofjax c;1 8+ah6s cingle 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 coi; ,eg q9oneu 2i5d(qgi+ekkq7 ypey::l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 tu xic2 wn2s;)upu:y:w4/lo xsqrns of wire on a square frame with sides 18 cm. A uniform magnetic field is a;swnxx uwi)q y/p: :l 2cosu42pplied 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 area zrbfxj *qjf 6*32kbur 4d.g 1sof $0.40 \; m^{2}$ 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 andayde9rw/:k4ky1wb 8 b 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 p.2oduvt*;r8/ lxivi 60 m flies horizontally at a location where the downward component of the Earthuv.v/8i i 2roxpl ;td*'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 annzzm vr2 q:oki5850sp gular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constan qvpsi5no:m2r85zz k 0t 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-j:vv upsv2t3 fr*;lu4 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 of9w6ee,4ro3 s-z kuorz 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 $emf$.

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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. Eachgt;8 (cz8tilm mv n6p*tl,1zh 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 zc,mt(8;tvt zp6 g*nmhl18 lithe 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 of wire of ags322n*; 9wiv7lljvq utnf pj+, p 7wmrea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output x0vf n;2 z8:hy k9wg5enwbx0 wof 12 V maximum when rotated at 60 H9xn by wk5w0wgf0evh:;2zxn8z. 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 genera)j1z6t )8qmpq5pvwepf fk( / )jf p-cytor 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 2jbxd*-ab /a: sz8u q2f7xc nkresistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operpub 0oebo:l 7(ates on 120 V AC, and when running at full speed it generates a (ep l0 ob7ou:bback $emf$ 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. Th/f k* +s dxufakf6p1e5d6,z,zxdy ;mse operating current , 6sdzu p*/6f+mkdz sed a,f;5xkxf1yis 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 24-V power supply.g kjnf71 -pqf:k bk16b The operating current is 1-1k:fng7pj fbk bq1k6 .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.s:m w m+ml5v-m0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back 5ml m-+mv:smw$emf$ 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 reuam1f3as d7b o/ vq4c0duce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the jcq87 djpf 6cbed 80apjb1 ;2gmy6j8hsecondary. How many turns are;b bj fa6 p 78qcpecj62y8m dj01j8gdh in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primaro./147sk(csnre efo ay if the 24-V secondary han.csf 47ea k/ s(reoo1s 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 coil and a 2000-g0m* (rsneg(q iy1-*u4 wc3; j pyelzdturn secondary coil. If the current in the secondaregy* npqy*1i 4; del3jsz((mcw-0gr u y 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% efficiency;on es q,70gys, howyngs 0q;7,eso 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 sign transformer provide:(c7k x teilv*s 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pkex v* i:c(t7lrimary 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 tu8q) xlp8 pmtx8rns on its primary coil and 300 turns on its seconmtp)x q88l px8dary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and w)5pbw4-bgdc4d3z ewb190e rr e. vzh300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present inpreegz341 .rwhv94bdw) bwzd-c b0 e5 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 2gd0..,mbnt/h:/mf rcg ix d +f00 turns. If the input current at the p.0 mrxd+.mi, :bfgnthgd/f/c rimary 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 secondail05- yn,vznf+va :ig ry has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage+vagzln5 fi:, viyn- 0 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 transfo0prcypq++ vj99bw4hb rmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 1+4bc9b+0hp jy 9qvrp w00 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 ni1;or 5 nc)6x eu3rcwV. The voltage is usually stepped up to 4500 V by a transformer and transm5n3xr; 6irn woc )uce1itted through a power line 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 curk,)tq 8qb q1iorent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total qit1 q8o,q) bkresistance 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 usuallyx, ,h ih+6s5bl2 lcdn4dzd:9dtsq 7zn stepped up to 4500 V by a transformer and transmit s n+d7xzqln6,ld5h4zc,st : ib d2dh9ted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 s cc)v7yqr/l- +j:crq W. A generator produces 100 V at 70 A. In order to reduce energy los +7ylr sq v-cr):jc/cqs 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 long has a total resistance of 0.60 W. A genernmj41, b/k6i/ rqxm 3wbbl6rd2 ruw8xator 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 o bxq,rlbm6j/ 1 imbrdkxww3/2 6u8r4n f 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 lessi46ff, o u0vcb power would be lost ifibv ,fc6f04u o the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a lin;a* ;r/pc1/ etpg z/qn6w98prwjqvfn c.9t yp e with resistance of 0.60 W. To what voltage must tp cz;/n89.ttcprqy16;g e9r/jf pp avq/wn* whe 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 energ3j paqp (41kyni/igkwj60 em*y is stored in the coil/(ie 03yqmg*j4 ap6pwjn1i kk 's magnetic 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 cob4couau;a u;,g u)/dk1as+vxntains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constant? gk)ub s,uadc/ o vu+u;4axa;1

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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 a(wtfrm :dpn9u6 k.in9isn )m7n 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 outlet.ude l 7d* xqey,6g ntnpt09+i. 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 resistance of tht5w uv0 -vjn*bki/f,gi:ro/ ze lam:iobw-jiu v n/0zrt/f 5,g*kvp?

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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 c) 8cg ry2(goel crff5;onnected to a 120-V ac power supply. What is the peak current through the recf gfg creo)l;82r5y(sistor?

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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 dixf4*xtg2s ql *ssipated in4g*qx2lsxft* 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 50sh 6p 1jf5nf-v-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W lr)th0 pd 8-4py0jb1 m pto3stresistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ,el:2pfn,p5im 4 he 5j6lkjal ov 0* gyy/o,qxis $I = 0.80 \sin (240 t)$. 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 in3qgztslxw53m a+rq gs 2 i(/.xductor 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 reaw1tl10jb 5gi jctance of a 2.50-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 14.0-mH coil have 14.0 W of ind+6o*blf o;n vqbepxr40vam8. uctive 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 neces)4i7 kevd1py4r / ztkvg6b *fgsary 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 u; y6sh tukm nr/.7 84jncd2nrAC at a frequency of 20 kHz is applied to i2jy kt7rmns8;6 /hu.cndur4n t?

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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 rs,g h y*fuf,-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 cayjf i+oq h36zq38m) tgpacitor 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 xe)d)zc t*a3k ow(l;4u v-tfbrh9go- 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-xz5lh la* h8m/mF capacitor 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 capac,bk :uuvr,xzb1m5,4 q rk2tkeitive reactance of a 0.010-mF capacitor be 100 W?: ,5k m tvzr2,4qkb euxkbr,1u

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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 Hz2 zecdw3g (9d b;)potp 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 se6ub, up 3pssnc-0v7xyries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance? vpxp 3 u70ssyu-6bc,n

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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 impedance2h meuzqr)7 c- at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFzc-rh27 mq) ue capacitor 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 coil mhgperg23us)1ri/ m2, and 1.0-mF capacitor are con)/21g3pmirum h rgse2 nected 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 sr 1mb4,a:4uru h xg5rferies with a 20-mH inductor, what is the impedance at 1rrr:4, a u1fmb54gu xh000 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 series with a 20-mH inductor, what is t 6.gk*;,b pjb 40h ;vocivxieywy7w8o he phasekw;gwh 6 , 7i0joxyvcb;o v8y. b4i*pe 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 need 5u7 ysdf/jenerd6w22 ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at d ufr7ej2de/6 25wysn1500 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 seriessmt8 jf8: rz2:heh y8o with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?s8t :2fyherj 8z8hom:

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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-mH ku s3l .)sfsf uk3d m2v5/xsz.inductor at 5000 Hz for a total imp.2um ksf3uzs sx5ds./vlfk)3edance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1icxrxy-; rt8 31 1vbdr.0-MHz for a total impedance of 150 kxv8 - irrrx3cbyd1;1 tW?

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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 ) nz:tgu36q.gwgjjf6a d 6;ovis the impedanj6wzfvq tj6; o gdgua:6g.n3)ce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a:qfjp hf9jdlpf 9p c1/ :3+7wuiu4 ahf total impedance ojpucq3ff hw1p lia4/uh:9p+ f7:j9f df 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 kH9c9wi oz9p;go hou6 3yz for a phase angle of9coyi3 zwpguo o969h; $40^{\circ}$?

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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 resis r7 65xjdocj9vtor at 1.0 kHz for a total impedancv65j dx7joc 9re 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 /hz57p: rnh kaa 100-mF capacitor at 120 Hz. What is the phase angle?k:prh7han/5 z

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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 1gvvq;n5+10elb4y5x+5tzv hzu2bw o t00-W resistor, 20-mH coil, and 1.0-mF capacitorwv +5vyt 0v55;znlbb 4qzh2+ex1gout 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/krkui( gj*,ek *ixeotw+0*q consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current i/t *0,xikkjeq +gkw u r*(*ioen 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 capa*q r/b5fekq e,*i ofv 7lu.n.itdp.0gcitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cn, ki0leb5er.d7f *pv*f.g.i /qt uoqircuit?

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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 1 **u qzl vt25pk3y;(zoypg2v0cybceRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplzo ;evcybpzgq2(lpt* * 0vc3k 5 21uyyy?

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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 serie8xp bp:q+wki0s with a 500-W resistor for a phase angle ofq :bk pw8xi0p+ $40^{\circ}$ 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 circuitudu4b s.(e7sv has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency su s.7sdv4(ue bhould the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac seref5 + fd; 8i:p,0qx,e(c ftfwyqaczaic5v7, bies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is0(wq z85:af+, iqy,v cifep c,fte7;bdcxa f5 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 *8 o7mujph;qbyc+ fm bgo5b3*AC 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 6 sxc7mj(/0x dg0 W and a resistance of 30 W. What is the7s(/mjdxg xc0 power 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 circuit containing a 50-W resifobm v;((mcws8vqlr,yz7 ):v stor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a(qb7ovmv:r)w;f ,l mczvys 8( 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 capacifa3tgglj+h v-8 v6i,ftor and a 15-mH coil in series?3ai6gl fv,h jgf8v-+t

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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 for a rehex4(spy e:mm55 g gu;sonant frequency of 1eps(u4; yme gg5x5:h m0 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 serzalnf)+ vc:se. gxb1im288 liies with a 3.7-mH inductor for a resonant freque2 zafxlmg18s)cni .:lve+ i8bncy 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 pwkui40yu wz2j67w m5dlaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit 5 wdkm0wziu2 6 uwy74jis to be 1000 Hz?

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