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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluhb * )4.uijdlcx 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 v t+es2nl*7vs f b)v2pthat 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 prox (n qu)u k9;gy0axc8gduces what kind of change on the 8u qkc;unyxa gx9g0 ()induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field t vs* nvnaf)954wd:x/ l +pu6 9lrfajrbhrough a loop of wire produces what kind of change on the induv:d vwl 5f/p9r4nb9*jal rs afn)xu6+ced $emf$, 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 /qhr/js5o:amo.*e go wire produces what kind of change on the induced /s*h5qorjego.ao/ :m $emf$, 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 +cxq0 hocfnfbw3tiiob,), 1u yq 8d9*field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a c0z.;bhv d:/s2udgt e j4z5llss;zx1aonductor will be that which tends to produce which of the following ef/v0;dx hus5b:sldsazj. e4 z2z lgt 1;fects?

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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 un.,uc0b)tp4k m9 xhzt8clegx opm06./ jj s1agnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed frjc 1. k6j t/8eup0zmhu0c,)px4n.9tm slbgox om above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnexw7q93ww snhd .gyyf /4c9/qpt is held above its center with its north y9d9cwxwfsg.p7q /h y4nq/w3 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 top in a region where the magnetic /dnud c1m;a6l field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cdn1dc au/m6l ;urrent 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 talg2utw6* yux,ble top in a region where the magnetic field vector points straigh tg*uyl,uxw62t up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top ido 5s k1geqly thfgp;0*3c 1q/n a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direc py5gg q s0ce3ql*hf1k1dt;o /tion of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tab tf-c/hwantzt)e5 oq +n1xw3(le and carries an ever-increasing current northward. Two coils of wire w5e+tno()3 t 1xzwt- haq c/fnlie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. y84a/n-rs4jnedn w2l9x6k d xsy0bdg3.n iv6 Ax0 628lgi3d-/ s64.avj9nwyx kdreny b sdn4n s the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wirci5v ,+*o/woj6 asvd- jt (arbe is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wh-v ,o+tc5/oir(wbs* v6jajadat 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 wire9iew*a0f ssr4 is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the sae9is04wr*f 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.lsdd b)a v; -7r,(fnlj
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an rfuz 6tg4 awkb 1c82re-pij)6$emf$ 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 t;k/j rr-w9)yxf0zb y magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwuo 2zd(m+v-ofard at constant velocity through a magnetic field that points straight 2mo (f-+oduvzdown. 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 angulax1zz*jy5dh2fw y+dbs3o.n c:r 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 generato qfsetvkmtuxalio0 2c3sf682l 6u8 (7r 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 revolutions each secoz0dvv3xa l6 m7 4gyfyv)fnh) 5nd. The frequency of the0l3y )vfa5znx)vmf6y 4g7hd v $emf$ 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 devye(/jrx dx0i;1wkj v8 ice 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 d9h rsbw-e h3f t(wm3vxe i699xpvu8 (tevice 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 sehc;xu vhg6,;g*1 mhl+di /wld condary coil contains more loops than the primary coil x v,m1gh;l6 gi/d;h*wu+lc hdthen 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 (nm 6gv wke jlg f:b7/:dc+3pecoil contains more loops than the secondary coil then i6w(/vm c n7:3 ge fkldbj:ge+pt 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 inpuev7p,d wx rx 4p.r nuq4d+8y*vt

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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 circu 821 lno 3vxgfekm4/ijwt19eqit,

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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 to an ideal batteo67gw 96nk lavxf3a/ery of constant terminal voltage. At the moment contact is made w 6kf9law 7goex3/n6vaith 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 s cb7g; 0cecnn- xt14oceries to an ideal battery of constant terminal voltage. At the momen bcxne4c1o 7cgnc;t0-t 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 resipni.mgs ;mb i.pzo90j rj :;l4stance 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 ih+z yxq233a glnductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected ivo1- m3rpqfb on,7urt mt qz+ *4ri46bn series to a battery. The time constanoq+nvm ir-,mr u1b*q46rfb 43ttzo p7t 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 con eo3s m+j1+fznnected in series to a battery. The battery is suddenly removed from the circuit. The time o +fsj+1znm3 econstant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have th1.ih5yk pqgazl *n/ d;e same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supr+u 2qz,ddhz, ply. 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 cir(y 9lp-op(3 0(amqfe,rxvprwcuit, the current0 f(pymr- vqp(p,r( 9aw3oelx

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance dy+jrsj:-9 uzin an ac circuit changes by what factor when the frequency is tr-+ dyz9j :ujrsipled?

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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 doub inz5eg,4gwz4)n tn l0led, the inductive reactance of that indu)i0w g tz4nn,4 5genlzctor

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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 ay2 o9wto9zpt- n inductor approaches zero, the inductive reactance of that coi-w2p 9tzotoy 9l

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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 cpk0oz9e1ywi;-9z av en sad;1 onnected to an AC power supply. In this circuit, the curre1 anyw pezd;o az-eiv9k19s; 0nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when thes2p;f-s cmlo- frequency ms-2lcs o;pf-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 approaches zero, the dh 5 a,5:sidchcapacitive reactance of that capa hc5a i,5hs:ddcitor

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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 uqk1m(xi0 6dy of the inductor and capacitor in a RLC series cqix61k(mu yd0ircuit?

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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 myj w)s5o +gr*wj9 t,acircuit 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 t,aszv: 4ogd: 7tfrdw,xg 9g8. The impedance of the circuit increases if R increases. 78 zfwavs49:x dtr, g,gt gdo:When 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 impedance of the circuit if o y+k ,f,8z-0ji-jmb(us lrnncreases 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 imo 0g)*v1o6mq( lef / dlcv ik40wn vqz6u8s0lbpedance 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 7pdji q872g/imd .u* irtcyi 8in an LRC series circuit, the reso7cg7 yr/tq di 8*im.jpd2i8iunant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC appli rgho. k.cfd73ed 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 5x26fuw;tassi: wz fz um5-1j 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 0.49ime ac7k sl010 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flsik7 al04 c9meux through the loop when the plane 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 0.10 m is rotating in a uniform magnetfab-q*e2din; l he5 mh 9xu-a5ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie 5e-9m25ixbhh unqd e*al-;fa ld 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 rayu3 5hpgp *bch49bd2 ,nqkgd 2wv)b4 odius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle ofbw2yvg,34bkp *gbdqu) 59 hd24 pnhco $30^{\circ}$.

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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 adjusgr39 3lqqpr(4*bzet u table 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:ds:z(u zu0si 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 witez 2:a xodu:1mh 200 turns 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 oeu:a2 xdz1: mfrom 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 av51h t g*s+ebyrd/bx9 )5ddxwith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns agw om8b4rl,+6hp irumm 9 w) t7nrjp3:nd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatgi9jzrc ,j q2oq 6db tx*wq58:e 9gnb)ion where the downward component of the Earth's magnetic b:j8jqr2g6 d g)wq9ozq xbe9c,i n5t*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 b 2/f*-rf raqxji2tt;rar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about ajrf qx22*i ttraf/;- r 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 crow(o 8oulslk08q/kkb4ss-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areetc /k010twofk e0a l,2puvw8a $0.090 \; m^{2}$ 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 armatur;)g1p)hehb.m r+zee le. Each loop is 12 cm long and 8 cm wide. rh mbh+ ) pgele)1ez;. 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 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 o+jk i6ll/ tnpd8r0xdn3i.3g* fwk2utf 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 an output o8w b*as1-bznfl nsf (8f 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available f8wb(nas8 nf-s* l1zb. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator w7yhck,.0,w. ghscd9tnju0k nith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The o5se/ ,zbzofm8xb 8x(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 Ws)n5 esvti r1j6eu p6xn.8wy2. The motor operates on 120 V AC, and when running at full speed it guxs28)r .6ytp ns61w 5ijeenvenerates 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 powoo1.9l b0xmc* qv fvy*er supply. The operating current is 1.0 A. What is the start-up . q oco9mybvx*0fl*1vcurrent?

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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 24r0l:pon 0bv/ef- d:oz-V power supply. The operatnp z fe0/-ro0:dblov :ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecte kkdf;z+a4jc8 d to a 24-V power supply. The operating current iskacd+ zk8 ;jf4 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformebvpr0d+c z:;or is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fllvkxhsf4. q3 bwa+s ,s* e7op7ow in the secondary.vfb7q*se w43 ,+saxs7pk l .ho How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns ke6b8 e)rf6oi are necessary in a 110-V primary if the 24-V second6 8e for)ebik6ary 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 coil and a 2000-/aeqkz2 bt5)c6 2rva d :riyd:turn secondary coil. If the current in thk at:bzqic 2 drd:y)6ea5r/2v e 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% efficiency15/xi esdrmnqf6 c-y5, how many amps at 24 V canmi f615cn5yq- s d/xre 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 sjjf ri)8j6;g2rt-v blign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the 8lj)g6v;frj2- ibrjt primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 t 3dxhq/f+ka*d:h olk.bg x-w, 3 q1andurns 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 is present in 3a .b-l*wg hxh/k,dq n +:fa1dxokq 3dthe 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 ha kvwy6dg 069ass 60 turns on its primary coil and 300 turns on its secondary coil. 0a6vdg6 s 9ykwIf 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 afaosl *9e*:;k rrc5nc wia1g7 nd its secondary has 200 turns. If the input current at t gn e w*:79occ;sak5l *r1airfhe 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 10h(aihxa( bmn-vu1 h:-0 turns and its secondary has 200 turns. If th v: mh1(hbx-ahia(-n ue input voltage 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 )v8 bq9j lyvu(bl m90yturns and its secondary has 200 turns. If the power input to the primary iyy bm8u0)bll( vv qj99s 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 usually steppphz/b al+ g6/ ti.2d7bv2lg kred up to 4500 V by a tranl+rbv tgp2h/g6k.za2/d b li7 sformer and transmitted 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 6wz +i( .1-dw(hlguy ly0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transfy+w .y il(zw(dhu-gl1ormer 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 )dlngn nmsr10, z5tq6current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission zm6 tn)q5g1nr,lnsd0 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 resit-(*lt in19.ip tvhhastance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss h it .l(vt-a9*tinph1due 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 generamj418y(capc7gz*yd m ghul+b5 3 d :iotor 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 l 3*h 7do4b+y8:p(z5mcjmi1gg yucdatransformer 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 100 6a1dwuo sf ftbeqza*1:9+ :yu+ln (ow0 V. How much less power would be lost if the power were transme +6w9unz:sfq1tyl1(w*b:duo a +ofaitted 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. lul0+w(5 flc dga v + j55x*l7xgrj4up It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be s+duc+ lx( grvja* 40lu57pfl5xlwg 5j tepped 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 6 ds6tmx0png /04lmg kenergy is stored in the coil's magnpm/tn660ms g dkxl04g etic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W r08 9akvs, aeh8zc xw*tesistor and an 18-H inductor. What is this cir ,8a9hest0zakv*x 8cwcuit'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 a:q-6zgzikj9 ra-va p )n 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 12an1o6xt9m6 gu -ick1g aa6g*w 0-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 amalc*v n.t31aipfelen5 . q9 : 120-V AC outlet. What is the resistance of the lampm9.lpn t3f q a*el nv5.ce:1ia?

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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 pox -j+/ljofz,rz6/c yqwer supply. What is the peak current through the resistj,cz yrx+fq /-6 oz/jlor?

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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 sgqa:712xxnt gb2su2 t9ex:w/y m0gu lupply. What is the power dissipatemquwy:xg1gbxe la22x:usg 029n7/tt d 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 resistor is cg6amc*prw:p3yq yf9 /w y9t2$I = 0.80 \sin (240 t)$. 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 5mt 8bm9skop0o .fx6j 8m,rf+w 0-W 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 axz52-.v ( hgw 7lrdjru 50-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.ye)ysg ) yx2u60-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil (xtfzg :iuo3i 2l* :ryat 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 coivvsx /2+ e xqre qev49zk6ts20l 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 157hng2tajctm.d05+hw. y qnq u p:o7u 26 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 as;s ch)sjf f3k*g5ge 1k4+ajft a frequency of 20 kHz is skasegjh f1)jc ;3 ffs4+k5 g*applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-Vyx;0hmr 3mzcg w):qm- , 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 capacitor at eb9+ /cq sj,bq8wp(t g10 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 to57eqk9wo yl*peow+ytc-ue1 ;c 4d- p u have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 5. yl3 6yezgo+ 2mjzrfW?

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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 c7q oe wz5v5cvm/ndk- z3:6i2vltrfy8apacitive reactance of a 0.010-mF capacitor be 100 W?m liet:/c v7-f5wv2yz qk38zd n6o5rv

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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 0.0bzv53b 15z*x7g g ndcw010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series,8 i v hsyn+e:qcp:9qw circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci89+yp q:sic,:weq vnhtive 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 dwjsl) :ed/0mresistor, 20-mH coil, and 1.0-mF capacitor are connected in seried/esmjw:0)d l s?

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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, and 1.0-wvju, nt-h a r3 j4osc1y9r4s*mF capacitor aj4sv3whtr 4 nuojcsy1a 9r,*-re 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 inductor,u 4jqbstqnr) q- z**z5 what is the impedqbz)rtq5* zq sj-4*u nance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH ik kx; c9+sxjv),zx qvlis;*c9 nductor, what is the phase angle atq9) zks;l;cxij*s ckvxx,v9+ 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil an;n 4wbm45lzud u i(0dbo-u, oed 1.0-mF capacitor for a total impeda0bdoo,lm;i5du4u e(zwb-u4 nnce 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 qntffy; .tb -3needed in series with a 100-W resistor and 15-mH coilfny-t. b 3qf;t to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for12nr+mpw acr,+c j 3)q zuzb4f a total imped,a2c+f qjc z rz)+mw4rp3b n1uance 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 1.0-MHz for a trp;g-a(y ;s;4 8 oh p)vhsqgahotal impedance a arp-y4qgvph;s;8og hh) s;(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 connecto0 .nhenb6g 1tewr57 xed in series with a 20-mF capacitor. What is the impedanceg70tn xne6 e.h1rob5w 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 capacitovf 3 :;fpqmd;jr at 1.0 kHz for a total impedance of 4qd3;mvpjf:; f 5 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.z;nrzgy 3a- o a 10-mF capacitor at 1.0 kHz for a phase angle3r za.nz g;oy- 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,c8 8+/esdkqdno(x ;- mu:4j nit.v kl5rwdrm for a total impedance of 4torni-d d +.8 csem8:xj 4;dm (,knuqr5/vlwk5 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 1bz:rd2 h 4+ l-l.s7npzj9oi uk20 Hz. What is the phase anb:j9hs4.zdi un-okrpl2z 7+l gle?

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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;uz s8,orz oy*j(k1kp 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series o;j,ozr y8k p(zs*uk1?

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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 capacitpn,ohkq7k q 6-u2a3dnor, and a 0.350-H inductor. The circuit is conne32nnqhpukd7 k-,aq6o cted 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 indul,6y ,k xsmu+hctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz pow+,x6m ,lsyhk uer 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 50-W resisto(z qahj)fb 5n2dy4y;l r, a 10-mlnd5yfah (qjz)y2 b 4;F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessa2gz)z r9.yh- lth86vjlrp9 ahry in series with a 500-W resistor for a phase angle of.96yrv-p rgjh9hl z8h2) zla t $40^{\circ}$ 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 mF. At what frequencyfz2t wlh0-i mvpqs rp7 ,*,e7h should the circuit be dri*f,- whv qzs2h,0 ipm7t7lre pven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, kd r5 kfo)o)d2x j ;)eck : pwj.io.bw3vjy)p115.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connect:w2kr ) b5kdjkcpow.j)x y) pf;v3oejd i)1o.ed to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iq og fq38z* ojolaw .7/vf8hb6s $63^{\circ}$. 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 impedanc :.+ffjd s.iexe of 60 W and a resistance of 30 W. What is the power fei.fs .dx:j+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 c5av ol5z+ae*8lz20wwz 3rf z fontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w5wzva *l frz e zl05ao2+8fz3when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 1 za+j,cnz n4r:5-mH coil in series?zj nn:c,zra 4+

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neei/eg,3 z .f nu8wilf )ba,a6qyded in series with a 4.7-mF capacitor for a resonant frequency of 10 kHz?fui g),,.yaf nlw izq/8bea 36

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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-fu ,jdd8h lmfcj9 (1o ,sg14eomH inductor for a resonant frequency of 1000 Hshm4 d918 j,old(cg f1uf,o jez?

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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 pla49i jxq99fehnay/ 1dmced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the x maf9iq4yeh91/dnj9 circuit is to be 1000 Hz?

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