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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 u183nv).h j p*nz ccslanits 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 stawk+. t.he1tzx tes 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 w35xwfg8kvatna a *;v9hat kind of change on the inducaxtv9n a3*;k 8vag fw5ed $emf$, 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 adx5 zucq6*)2 l gvm;3rd cit8b loop of wire produces what kind *l tz5gcdu 2mqc8 dv6b3ri);xof 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 change on thehg5 )+owy: aj;3dwj pm inducog;jywh3w:apd+ )5mj ed $emf$, 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 magnnlymlp g li,u8 6+h7 fzd78m+uetic 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 conddkp2r3ngijqh vn20;1 uctor will be that which tends to produce which of the f3qi;jd p 2vg khrn012nollowing 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+rerl-e to/ g7 horizontal table. A bar magnet is held above its center with its north pole pointinree r+7 o-/ltgg 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 horizontal table. A bar magnet is he1 mj vvm4qz8zm80n(j hld above its cent nj4mv jm1qm8v(zh 8z0er 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 top in a region where the magnetic x5oi4a6k dr .zfield vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what i56rz i4d.a kxos the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vectuvah+se t f:hza5+iz(:x:-cg or points straight up. The magnetic field suddenly grows stronger. W (g ch:fxza+ahs5e+:-z:ivtu hen 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 horix0n .q igs cf kbwvm.j+)iy;+7zontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field di7;n .wk.cx0 +i+q)yfvmjis b gsappears?

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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 j: sa*d3lq if)lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wi3j d )faqsi*:lre. 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 noi()p1dxpuo/,*k) tnfy r4wpo rth pole entering first. As the north ( fnpo,r)p4t w)d/1o*upi yxkpole 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 wire is rotated at constant angular speedyezje ,k1 - c3zzc9sn7 about an axis whose direction can be varied. In a regiok7cz3 1s-ej,yn c ez9zn 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 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*cnbq9;d +ku m whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien9 k;nu* d+qmbctation 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. (btm0v;-b :im-vt qn kvhr/m1
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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 anov)zj+-h tqks3q qb;hnua b6kr.21b5 $emf$ 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 fielmxttztwv d k (dlcw vz95m/)2)3t.zx- d. 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) is2r 5,jh 8im2 gumtv8pp moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning ttmr 5im88j2 gp,2vuhphe 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 b h,s36ktrv q ln*hiaabc7f* 4.ar rotates at a constant 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 bsy *5gk6 5movc3h ef2j(l4 7gssoo0orms

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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 second. The 0 n9hevf0ie5supq)d/ frequency of tifp9en u/e5vh) 0 qs0dhe $emf$ 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 usede*xq:8axkj y nx* i:p+z 5c2k;n i;pby 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 devi;tnxz iad pjr,gzkuf*78-+ s)ce 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 containsw( x*qoakg.p0 s8f wwgb /xd*5 more loops than the primary coil then it is *qo dgxwks(b p 8ww5.*f0g/axa

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondaryn eb(m/-s9sxc7(qvy b coil then it i s(b(mbcy xvse7/-nq9s 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, th2/:i 5;wrt8q fehb)e (jjpwhye power 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 circh0 0oxx0l(/u ; vx20awjudxgruit,

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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 battery of tqbu-le4 gbc- jjy -01constant terminal voltage. At the moment contact is made with the battery, the voltage across the reb-j4lu 1tcbe-yjg -0q sistor 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 connectedxohf,u81 c0gp cmwzk ms1 2*c: in series to an ideal battery of constant terminal voltage. At the mome0 gszf*: o xh2ckm8cm1 ucpw,1nt 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 resistance2e4u i+gbmsck6plx ;* 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 resistance R is conne5 1,l8i3 njumd6zxsv icted 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 batter4q rxidq i38v*39c .vyt+hg hey. The time constant for the circuit represents the time requ+r3g4vii8* t h x.v3ydhq q9ceired 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 battery. The battqm .c7,ffb+ g* h/iz/8srybd zery is suddenly removed from the circuit. The time constant for of the circuit represents hf c, sqr*gfbizz+/8 d/m.7ybthe 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 sshe hy,09pv3vt9 v) nrb6 ls5the 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 supply. On this circtvxz:f 7c9 d-euit, 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 currenws6:7bc2n w.hozi vx 8t2b.i:vs zhw n7 wc6x8o

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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 fa683*g m aayk d7wodkh:ctor when the frequency is triploa6 k*dd:k 83hm7gywa ed?

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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 voltagezs6z mx 1sl -ic 9fgz./zuyq- u-efq26 across an inductor is doubled, the inductive reactance ofcziu eqlx6zs62-m1zs -qf-/9gf.y zu 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 acror)8m w.alxu c: 3un6sbss an inductor approaches zero, the inductive reactance.cr6xulbusw 3: a8m n) of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an Aw;gwo9 m dy:n8C power supply. In this circuit, the curren;n9m :gw8d ywot

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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 circuitx3ats)nb0elpv,by :,e00hj v changes by what factor when the frequency is tripledyj :t03,le0he n,sva)p bx 0vb?

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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 cap7 eehhwd p ne(5)i)mt;acitive reactance of d t(e5ephm 7)einh;w )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 capzt: fkl)w) b:vbcy7m f:ya*d1acitor in a RLC series cir7c a:)* mf:tfb dw)zvly :ybk1cuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is definedd96sfk4* dwh 7iow a(j 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 impeda nqy+vg/t: n:fphe 9y1nce of the circuit increases if R increases. When is this statementpyfgq:n 9e/vhn 1ty:+ 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 t;gjt-gz*v o6 yhe 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 of the circuit increa- le uo6-0rhlkda++samb3,yef 9e 2mt;m. qqgses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circutru2t(:ocl8jxr,7;omdrq2 lqt juza ,p)o. 9 it, the resonant frequency of that circuit w (u tqj2j)mqt ;a,: odoc,7xtr8zu2r9rplo.lill

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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 apjmvf/v5 r;q9kj2g mv/plied 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 10,*tbtnwxy/ 4zezzw 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 radiusql 9p*1iw.mbf 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 and1qmf*bwp. 9 il 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 rolawj rh++qd/b4vcg/5tating in a uniform magnetic field of 0.20 j+//4 d+wh g5c lqbvarT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatingoq 6pggw )41fk in a uniform magnetic field of 0.20 T. Find the magnetic flkp6g ) q41ofgwux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from7nesi *h-s p9b $1.0 \; m^{2}$ 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 frrfyq4y,tsxzl keu2r:0iul 1plms +1 sy j*280om $4.0 \times 10^{-5} \; Wb$ 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 sq5)m/c g:v,m27 uju giza4 ll8k,enupfuare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane e5ng8lp cvja),7gfk,z4u2iuml:m/u 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 ay5fpa/m *w (/forl s7an 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 and area)u7xzafm k; 0h $0.20 \; m^{2}$ 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 zw xk) +t(jl.hlocation where the downward component of the Earth's magnetic f+)k.jtxw z(h lield 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 0amitp xh; :9av0qip, a constant angular velocity of 2.0 rad/s about a vertical axis through oniia : 0tmp ;,aqvhx9p0e of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional areap zty 1x bru5*((76ja ,o qz;taluj/xg 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 consl7h1ok kyvxzrp+yp 0 v69g7(kists of 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 rectann-h cj 8x,(o/ehthyefy+ )l;m gular loops on its 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 outputyj oem(hfch; -e),h8 /x+yltn 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 ofleuy0/fm4 zi9 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 A v+(5qvfuqob2 C generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of qqfov5( vu+b20.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a max83x lrd2rp(+ukmtb)r5 qsw-rimum $emf$ 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 motorg 1(xc.ywon q- have a resistance 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 ut .0y*6b zyjzu+xt:s.00 W. The motor operates on 120 V AC, and when running at fullyztbx u6z+ s0.uj t*y: speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power r)6upef mcso ;iim1f3;,n3bpsupply. The operating current is 1.0 A.m1i3mirc3 pubo;f; epn f6s,) 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 resisprxy m4sm(olp y(r. 6a.of iy*k --4cvtance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the baclfyra-py- com6*sk y(ovp.4 r m (ix4.k $emf$ 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 resi/dlsbs t.x 1z 30p4 x4uw7lzgzstance 6.0 W is connected to a 24-V power supply. The opx x3w/du1z4 4zgls .slztpb07erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volcp cs-o314e qwi. /krzei50bk tage 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 ey7 z5yr7d lyl),s*cwof a transformer causes 14 A to flow in the secondary. How many turns are in the se we clyy,s7lry5*dz)7condary?

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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 11zs0ma yb v:a 24yctf0htn.g :c0 d)-my0-V primary if the 24-V seconc42y afd g0:n tmh ay-).t0yvbm:z0c sdary 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 cqf -neo,1ik a3oil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is theqkoa,3-fni 1e 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 transfor,pfsa;qhu qz4t;f; n 4mer. Assuming 100% efficiency, how many amps at 24 V can4n, ;pf s;a uf;4zhtqq 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 tcibgzih b 05-m:rla+pzb+m7y8 r y,-k ransformer provides 7500 V at 10.0 mA. The primary coil o- :l-cb i0abkzrm m7,yizbp+yh8 5g r+perates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its p ,lb3tlxvxk+lj7wr *u,3n3kerimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p bk*vw,k3n 3r l7 j3l+t,xxeulrimary, 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 300 turns o6+(lnrbwb e5 ln its secondary coil. If 120 V at 2.0 A is applied to the primary, wh5e l+rlw(bb6 nat current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns*9tgzf cmo.+i . If the input current at the primary is fig.c *+ztm 9o100 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 1009l u*ndyg0n o zq/juln3oj/5. turns and its secondary has 200 turns. If the input voltage to the primary is 105ndog39/o nj n yj*ulquz/.l0 0 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 200jlfvf5 + ohh3ao9p /0y turns. If the power input to the primary is 100 W, we can expect the power output of jf3l+ yp/o0h f9 h5ovathe 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 4tnd7ko- gtax.69 kreusually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 6ak79ng4x tedto.r- khas 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 vozews1 idn 0zlpl90 5r)ltage is usually stepped u0srz p0li) z5w 9lned1p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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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 ag60jo7hn+ szet 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 lo67enz0gsj +host 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:xc4aoa a 9v)g of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a tu 9xaoc:gv a)a4rns 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 ,d lijo80k6fv generator produces 100 V at 70 A. In order to reduce energy loss due to ,0fkodv6lj 8i 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. 7izsj,vg 1o ly z*3z gxhw05e) How much less power would be lost if the poh o5yz)g0j*zilw x173gs,ezvwer 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 440ra kta3io;-k( V at 20 A. It is to be transmitted on a line with resistance 3a-(ratio ; kkof 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current/xn-:fec a+w )lwp0qi of 5.0 A. How much energy is stored in the coil0p:cefl w)an-xqw /i +'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 contains a 6.0-W resistorb/0fk d;ieeppi+*,02k ib mdh and an 18-H inductor. What is this circuiidki +h2ib ;d*be/0 p,f0ke pmt'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 voltaj)3kw5ee7fjihda66 h,c0yx)of0du p ge in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cu :a6x23ye x0hmd/ds btse42norrent?

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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. W 6 z6 khqxl9phu04d*1jpaive :hat is the resistance of the lamp?q4k dijhe6 hxu:0 a1z p9lv*6p

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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 connectefjbp*2ad/tuk ,w hd:*3 9ajxxpnw ( n3d to a 120-V ac power supply. What is the peak current p d 3w*t(9k:w,xuapdnhx/2n*a f b3jjthrough the resistor?

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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 sufz+ 89z-so+zgm ylc): xcsrx :pply. What is the power dissipated in thsofs+ x: ) 8gx-+ cczrm9zy:lze 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 d5pswgnif c zus 2u(u 7/2f6n.a 50-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 resistor-ebvfdu-0ws8l )76u7mc7erora n :iv 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 ivnu p+pdd p-y/.y m-z6s $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH induct n5icg)zdl/; kor 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 reacxlm, fqb ;v(n9f05 9; jsje8vfd xrux(tance 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.jv,i 8 yqx9tv3f3lcw90 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 forfh -32t:7ro5 x-o/ynmthf ebh 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 6fnik(d -plgk.u -c.l9 w.ur5o.uxka: 0-mH inductor when 120 V AC at a frequency of 20 kHz is appliedxadkp9 o.lg -fw5- .ck ru(. .uiul:nk 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 11s b+f.y rfyk-90-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 capacitor at 10 kHzng0pc7oy-(- w, kmpwq ?

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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 capacitive2*)0jwycr v y2hm,uke 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-mFyh7zl) ebyw *85g 4wpo 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 z..u4fxmzd ;4gju fevl/e)(dthe capacitive reactance of a 0.010-mF capacitor be 100 W? u.mxl .4)dfgv f/(je;4uezdz

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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 5/2 z6kge :mgbn+f-qoi9ws dstv 6;pb5.0 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 circuit with 12.0 W resistance, 15.0 W ing/pvszky +eus7a m-41ductive reactane1u4 syvk+gzp7-s /ma ce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resiskx3g.nx8n(nk 6di,d ptor, 20-mH coil, and 1.0-mF capacitor are connected in (8,dinp3 dx .ngn 6xkkseries?

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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 ayrv9w 2 n88xou 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?8x29nyu w orv8

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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 seriej k tlh0g6l-)ps with a 20-mH inductor, what is the impedance at tlhpg- l 60j)k1000 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 isj2cgi01f 2c hv.v jyljmm3x(pewn+ ;3 the phase angle at 1000 Hzxjh;lv+jm3j1 g0.wp cvyn fmc22i(3 e?

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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 and 1.0-bf o.p35al*qw mF capacitor for a total impedbq*53lo .fw paance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in /k r u5+z kawzszm5pl7v*3y2mseries with a 100-W resistor and 15-mH coil to get a total imkz5pmm3z5w zk*2sv 7/lry u+apedance 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 inducto; ti ukagm-)w8r at 5000 Hz for a total impedance of 40000u w g;ki8t-m)a 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 oz)e;)n qu.2 ,esggkiw g37i mresistor at 1.0-MHz for a total impedanis)g.nog7u3i)k,2 g; qmz eewce 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 chd 1 *zc6)u5mh okwgw5 -osd2papacitor. What is the impedance at 1000 H)ows-c5kw15*g 2du6 h pomdhz z?

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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 semo2xlzu. 28e9n 5ec myries with a 10-mF capacitor at 1.0 kHz for a total impedomenml22e8 5xc 9zuy .ance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 1 - z+pzn85sv*trp noy/q )k5e:awxj0t0-mF capacitor at 1.0 kHz for a phase angl0*jtw8 r o5pvnp sk-nyz )z+qxt:/ea5e 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 withyrwg, is j95sbt6 c4v* a 30-W resistor at 1.0 kHz for a total impedancer 4 6* 9c,tvjiw5ysbgs of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 1l1+mgf*, kth+*bfni r6n(ps q00-mF capacitor at 120 Hz. What is the phase angl++ q6hsm,f1tfbi*k*(g pnrlne?

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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, gy pwmr;h3 ms5mp0ipgq+v3+3v5p re *20-mH coil, and 1.0-mF capacitor are connmh m 3;y3vg ep *+ ivmqr+5rpw0p5gps3ected 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,*o d8 w.yqozvpzt2 8x.kcu-l 4 and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supp o4q2 -lu .zcyz.8t*kdwvox8p ly. 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 capacno;umh p/o5 (kvlfsj r 48xp47itive reactance 30 W, and an inductor of inductivef5 (p sxupr4 nm8kl h/jo7vo;4 reactance 30 W are connected in series to a 110-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 serly sq8wz(v7 ,fies RLC circuit containing a 50-W resistor, a 10-mF capacitor, l7,wzfyqs8 (vand 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 necessary in series with a 500-W resistor for a phase anns6w/ . jugxx)twv /3ugle of x/tw/x63suv .gn u w)j$40^{\circ}$ 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 freque *m 0rh8-y/ x(cafv:dsmc t7s vu.8jazncy should the circuit 8 (ycxs au*mav.tzrh -:8 07mdcfvsj/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 series circuit wrjx:x v8pd ;u*ith 12.0 W resistance, 15.0 W inductive reactance, and 10;:dp rju *xxv8.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cig/nz*g55ynm jrwo( 1z)lr a3frcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What isybcn4s n2cf0mjne/k-w g+sa.h 9mf,/ the power factor ff/y4ghm+cj.c-/n assnbnw , em290k ?

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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 6c1bs)l yr lz q+:q,erRLC circuit containing a 50-W resistor, a 10-mF capacitqc 6:blserylq ,)z +1ror, and a 0.45-H inductor, 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 capaci; itdeld j139/gjbtc ysp j(.k9 7tp4itor and a 15-mH coil in series?pjgjd d9(e/byt74 .9sit;p ckti j3l1

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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 se36zldh2lfu 6a1v5d nch*x. wmries with a 4.7-mF capacitor for a resonant frequency of 10 kHz5a6hful m* ddx2czn361lwh .v?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant +slwr,6k0osg frequency ofks rw0gs+6,lo 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 bey *z3a,+zkj6s; mg w1hj .qhvi7ikx d8 placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to ija6z, qy1ijzk.8 ;g7h3*vk +dsmhx wbe 1000 Hz?

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