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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 flux excee o*x rq,7cyk:pt

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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 st1eaaag s2i8p1r ,7 ktkates 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 loopz1 5 iju9yyr:ps of wire in a coil produces what kind of change on the indu :5rz1ip9yjyu ced $emf$, 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 th. 0nkoshf)i6ue magnetic field through a loop of wire produces what kind of change on thei. nsoh 0f6u)k 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 chan7ilaefjh7grp 7 f2 xs)kmh9-4 ge on the induc l4gfa7hs- ip jrxk7e )hm97f2ed $emf$, 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 fromvw ths:y. 2h4 t2i88s quakx3i 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 anifr( jbk f) +4hd/4hok induced current in a conductor will be that which tends to produce which of the following effect+dr ) bffo/k4hhk(j4i s?

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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 o+p cqqjy0 s mecs6x2+1n a horizontal table. A bar magnet is held above its center with its north pole pointing down.q0 j s cepq21sc++6mxy 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 held abov x7 ms;ix;q 5(z8dmsiwe its center with its north pole pointing down, and released. As it approaches the coil, the fallsis7i;x5zmd q( x8;mwing 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 magneticxvtu eafncg.; j/123 f field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of 1.;ej ng3/t fc a2xfuvthe 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 tableeklv; gzy3 q 0ay,1vd. top in a region where the magnetic field vector points straigvakyeyd. l3g,0z1 ;vq ht 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 in a region where the magnjxkk.ortt6:w azv 1,sd*,zx8etic 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 ,rx8s k wto kx1,.: vdtjzz6*afield disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries a j(-ab/au.h wzn ever-increasing current northward. Two coils of wire lie flat onb. aujz(w/ha- 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 with7c0l i pkei0o267j pmh the north pole entering first. As the north pole enters the wire, the induced curren07ilpkij7 0m hc6eo2pt 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 speed ljjcs3 * aad1:p jc,m(about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if thjals ,j d 3jcpc*(:1ame 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 angu1,0:eg vwtz mvlar speed about an axis whose direction can be varied. In :vve gzt1m w,0a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. asnmlivy :n5u9 w9,p4
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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 tha7 uale8uw o k4jp6q9n8mu:h8pt 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. x.ypv:y wa:w tk b6;4smtw6:f dy-hc2The $emf$ 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 diy1xz tj28/ x2wh36lyhkzdn.erection) is moved northward at constant velocity through a magnetic field that points straight down. Make a stat hjzk1x 8/ynde xz2lth y6.w23ement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular ve9h *lglk9x-qq okaqc zb 87)u7locity $\omega$ 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 generator5zvwh f:v107v no xyz- 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 revoluj / zp;.erhse6tions each second. The frequency of thee p.z ;sehjr/6 $emf$ 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 ush;b: hqhn*+h3b oa 1ised to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device zf 7gwh:6x.uwc6 qyn+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 loops than the pr4d3n nyb paueu08ls.no-6 c(l imary coil theysnudln b l-6 a4n.p( u83c0oen 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 tu6ls6*zki if; he primary coil contains more loops than the secondary coil then it f *is6klzi;6uis 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 tq(d)d zb*phis+ 1 t*epower 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 cir53md k7o6g,bezn9 nfc cuit,

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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 ind ylrf8 j+k9mv.uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volta.k j9ymfl r8+vge across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of 0q2 ot (8gangvconstant terminal voltage. At the moment contact is made with the battery, t qt2v0n8g(oa ghe 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 io )p.oj dnzq0 )sva-0is 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 p0l:3 zrb a fuc4j2un,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 batterofd fe8)ou usfr79dh*vs5xres0 5,84 + ydg axy. The time constant for the circuit represents h+sx4es50og 9do,dsf8ru* )vef8xf r yu7 5adthe 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 battery. The battery 4f9o7t -kycb pis suddenly removed from the circuit. The time constanpf9 tb7-ocky4 t 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 the same units except: gcpdi7m( fv *xb2s.km42:9l+ uwmy xz

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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 thx9l7ncmyn a27 *8rxtq is 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 pow(/k0myqno pb*er supply. In this circuit, the currenb0/ pn oqm(ky*t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancv*jz xluh/*2 ue in an ac circuit changes by what factor when the frequencz* jh2xuu*v/ ly is tripled?

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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 mlgf;,ec .m7bled, the inductive reactance bm; ,gm7.lecf of 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 acrossx k *dme x2lhx7;fh4d+ an inductor approaches zero, the inductive reacta;e*+dh7dxx m fkh2l4xnce 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 ttow )hij x.c)1o an AC power supply. In this circuit, the curren) c1.xi)otj hwt

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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 bwq9so dr1 9q*e*n1n p-votw/z6k+x wfactor when the frequency isw1k*benq* p xt 9 wvo6s-9oz1dw/rqn+ 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 rfy-mtjbq5 4 0across a capacitor approaches zero, the capacitive reactance o fbjm-y0q4t r5f 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 b5+zr 1ea b426ubawejthe voltages of the inductor and capacitor in a RLabz b5216 reea+uj4bwC series 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 circuit is defb b)*k. ex+-xq vz;cl7ovebcn 1x ,/wzined 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 R ifgkv.w3gk- k3 ncreases. When is this statement true 33kvfg k-.kgw?

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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 imped,e 7m,/fbrxe cance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuiex+8 ;j r.iaptt 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)7cth u yv5g+v * ivk5dvq*/na double in an LRC series circuit, the resonant frequency of that cdv iv5 h u+q*5vncgv*/y7)atkircuit 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 reoksa+ ,ib04, tzglnqcixh/+ :9 pay m8sonance,

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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 occurs1wnb 8ygg37w uy;bto5cf b6c, 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 rotatipx o1 3vtbv(79yo 9swlng 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 parallw9byo3p7x19v (t lv soel.

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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 in5ds0qhm0q(oy ot p.o6 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 perpendicular.mo o.q6sqo5t0ph( 0 yd

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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 rewj5x(4 .g nue.ox 4qaadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Finx(4uewjeg4qnax o.. 5d the magnetic flux 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 reduceia )gaipz9rkb0) 3r m.d 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 ch/aeoq64 f:h vpanges 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 turns of wire on a square fr ,a ok9g)rpjg0oxg0i7ame with sides 18 cm. A uniform magnetic field is a)r00a9 7koxig o ,jgpgpplied 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 wr6 slaak k.;9 :gk.aue lj2zy(,+wuyzith 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 and area+ojox/o33vj;uxs va3 $0.20 \; m^{2}$ 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 vm5/,l cppv2 bs ta/x5of 60 m flies horizontally at a location where the downward component of the Earth's magneticpbs5m ,tv2xp 5calv// 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 u; wqbhkj/-, eis 2.0 m long rotates at a constant angular velocity of 2.0 rad/s abw, ke-hqbu /;jout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crossi ufkcudx r0s 5t:;.k4owp.u9 -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 10z a1usc)p:va-0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Ea.bm*)oq4hqc fs/0of t ch 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 fieldtos/4ohq m0c )*fqb. f 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 consistk7 ms5 :)v-9 mk cvriidcbtu+.s 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 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 outpqfjt)i ss+f.xl;4p 8k ut of 12 V maximum when rotated sip)k;fl +t j.f48qxsat 60 Hz. 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 generat vi n/7vkcsi.jb.0je:b8i + agsi0df2or with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.033ggpl9 .ri nkex1r.p0 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 resistan(h or( pvm k7e0c9bvp*ce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gener0v e bmhrv(ko(*c9p p7ates 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 ak8:7(l cdhekw2 s9gih 24-V power supply. The operating current is 1.0 A. What is the shk:ecw782i9g dslk (htart-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 connectecylh7fc027 nve oao +*d to a 24-V power supply. The operating current is 1.0 A at full +ca7 0f2*eyvlch o7nospeed. 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 connectedu.kfb8*k bf* d to a 24-V power supply. The operating current is 1.0 A at ffk8bdk*f . ub*ull 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 volj20 jtnuq9mp/ 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 of a transformer causw)lanrvk 6h5dqx ze47b9x1 d 0e:-; )b lxxynjes 14 A to flow in the secondary. z 6rxdlw:n-a1bx7nx)54ej;behv 9lkx0) q d y 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 are necesa1* m8uec8of 9x jftf,x40t irsary in a 110-V primary if the 24-V secondarcom jf*a1 i 88xruef4x0 ft,t9y 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-turn 4*emsoverz 4.- uc w6csecondary coil. If the current in the secondary is 3.0 A, whatsrc4e w o* zuc-.evm46 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 transfoq *.zdg 1pjg4(ok*.sybfy* xh/zi y+prmer. Assuming 100% efficiency, how many amps at 2(szqgp1xg *+oyh*b /.*df. ypiyz 4jk4 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 provides 7500 V aspoa yg 0e 91uy/lem87b mpc14t 10.0 mA. The primary coil operatcp1y 4 myp7smuog9/ 18elb0 eaes 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 auf ej;5+kb1n/k3+ i kn fnnv3primary 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 the s35;n j 3 knf 1vunae+/kknb+ifecondary?

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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 sfs hih ev)4/zy 2;a7oon its secondary coil. If 120 V at 2.0 A is applied to the primary, wha f7yh/4svse zo)ih a;2t 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 turmc)9af mvtm;s-(g.x x*p- n hcns and its secondary has 200 turns. If the input curre .msvxfpmn)x;hga( mt-9 *c-cnt at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns , tuk2fenjs 3;and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect t2 ek,su tf3n;jhe 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 seh9tn)9i3pmvir)gx d + condary has 200 turns. If the power input to i3it9+rhg) x)9d mnpv the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped bll o*r.j;wk 3up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0l 3*j.w lbrok; 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 a7-:pfy8i b1p )f2urw9q pn lfA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line op8wpbfu: 7ap2ff)i l- qyrn91f total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Txtp) a8q4y 8srokqk+1he voltage is usually stepped up to 4500 V by a transformer and transmitted through a pow1po)+q8s kt yq 4ra8kxer 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 l/17deniyw49hx r7rctine 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce e9r174 d riye7tw xc/hnnergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genej9xtcgb ok3z1jq+9/9 qsyvg;:r lqd7xc 8( gerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the1qq sg79jby o( ek9gzdjcclq3 :g8t+/x;x r9v 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 lwl i,s8d-auq6w 2q s:wine at 1000 V. How much less power would be lost if the power were transmittd-usswl :26 qi qww,8aed 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. ,jt ks3.dng(nc j -v:3y+mwek It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exce+k3. -c dgy,sj(we:vn mt3njk ed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in 2*acsierw sn 7ip+(:gthe coil's magncw in27a*+: s pgersi(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 resistor and an 18-H inductor. What i 27lcrp:1kjies this circul2i7 p:k rc1ejit'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 voltagekd 9)adj gra0+ 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 currz mj.u3u8lqg33w dgo-ent?

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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 157uz s hpu:5rihv9-sshy2je.b t;t7 d20-V AC outlet. What is the resistance of the lamp?i u:-h ds5pb.uh sz7hery72s 9;jvt t5

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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 powel1s 3ykicp3h-,s2xo 0 l6 oncjr supply. What is the peak current th3 0c is6oj3-2phlkn1yxs,co l rough 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 supply. What is t.i/l* -y nlnvtz894jm+ uj jvshe power dissipated in the s/.8 ivlnj 9y4-ztjnlj*uv+mresistor?

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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(i h(ly3v/u ml $I = 0.80 \sin (240 t)$. 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 ii59+t) oo .iiz3iba o iokx/)1om7fdms $I = 0.80 \sin (240 t)$. 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 resis1wm2lanz t2 wlo vp/bq5m43b4bx68bhtor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH ipwfw5 l:tm(/znductor 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 y+5md uw 9exey h :d 86be/k1nfpy9d(ocoil 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-mf/c. altuw.3w)* r qojj0 .wrsH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157w0 shy4lukx49: o z+bi6u4aoo 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 iayp; *ix)g(dqv 3emh 4ch; 3chn a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applh ma 3(i4 h;xh3 )v;*dgycceqpied 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-V, 60.0 Hz souzh-9zr z8 :ftkrce?

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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 ojg i0+(y.sns+i (uo -qwba7mof a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 jlwz4xoe vni -x24k1l/t*7z y :y j6ldW 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 rtw :y+u.y) yxbeactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF c:o1bgq(4q q 5w fa.3qh1flxmc apacitor be 100 W?1qqfhbo31gac(m4ql xq. w 5f:

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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-mFuo 3i7* zmk f;l) p4bzq1/vfrk 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 circuit with 12.0 W resistance, 15.0 W inteqo r+w 6+3fvhuv)o 6d vt)rh o e6qof6+u+w3vuctive reactance, 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 resistor, 20-mH coil, aso9)zu- z2cz(j5ew(gljs c6fnd 1.0-z2eoulf6(zcjsw- j g5s)9zc (mF 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 aty; tdey6 z2jx1 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor adxj6yt1 e2z;yre 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,fsxt kbl*,3rmlji rg4, 268 ml what is the impedance at 1000js 8kg*,2xli 4l 6,rtmmlf3rb 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 inductif s); zy:)*tlu k je8byb) vmg+0m1door, what is the phase angle at 1000 Hz 8*ijo:fml ks;yvdum0 yz))g)e+ tb1 b?

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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 k 8o vrpvl)3 k vf;.9 jh3nu43v7vnx -fsvu)nf1.0-mF capacitor for a total impedance of 10 ;nfvu p8 74 -3xhvn3 svf.jronu3v))lkf9 vkv0 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 series with a xu*rdh+5z1hz ouq 9 *1yarg )3qvok (i100-W resistor and 15-mH coil to get a total impqz*v5ru)ih (ay xq9uh+g31*o ro1z kdedance 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 i i(x+d/we/s fbnductor at 5000 Hz for a total imw //d(besf+ xipedance 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 m)yp4y z8 vhg94h;nv uat 1.0-MHz for a total impedance of 150 ;mnh zg849v u)h4vy ypkW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is cp t-b-ya b2a/the impedanceptab -yab2-/c 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 neewi8l9 2eoq1pdded in series with a 10-mF capacitor at 1.0 kHz for a total impedance oiq9 1elwp 2od8f 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 seriesxqg: )z3kv k dyoq )y0e7,ah/4imqoym9z 99 io with a 10-mF capacitor at 1.0 kHz for a phase angle of)o io:oyxqz kdk3 7 z,9q0 a e)miym499vgq/yh $40^{\circ}$?

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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 w8h;f4vkc ) lguag,h,k ith a 30-W resistor at 1.0 kHz for a total,h klufgha)4;k,gv 8c impedance 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 uydb+s54pexvyyy73 xu b3a/bc+xaxd0e*. 8b with a 100-mF capacitor at 120 Hz. What is the pha/xxyy 5xbb8 3*vep +3.7d0 uyausb+cd 4 bxyease angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH noqs9(ukz ;j5coil, and 1.0-mF capacitor are cou (knj 59zo;sqnnected 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 100fpnro +th 7+ ho5.tv9bkt-sn9-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to ah n t59 7-+9tnk rtsfvo+h.opb 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 reactanx ukfi2lg3fe,gc d4o* vb-9 p0ce 30 W, and an inductor of inductive reactance 30 W are connec b p-*gcdf 4ge30iox,k29fuvlted 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 series RLC circuit containing a 50-W resistor, a 1tcowjom+ jf 68p .hi(;0-mF capacitor, and a 0.45-H inductor, when co. o+m wpf jjt6c(i;o8hnnected 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 necesynds7c.abk :*fzn ,d9sary in series with a 500-W resistor for a phase angle of z ,: cbnsakdf9y.*d7n$40^{\circ}$ 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(6ai ;a+ e faab7hzoma,ut74gncy should the circuit be driven in order to have maximum power transferred from the driving sourcg a4,aiaaoa(6tu 77m+bzh e; fe?

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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 resistatn2 8;ywtl im.nce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12l;m8 iwn.2tyt 0-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 a . 7jkvlh6ke7aayjo3.n 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 60 W and a resistance of 30 W. sxb,k7 lz4/(tmtdxp y 6k.:oj What is the pty/dt4zpx6.l k7j:sobx (m,kower 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 resisbuz./ na y*e ju-f6/cytor, a 10-mF capacitor, and a 0.45-H inductor, when connecte.ujncy -e* 6buzf a//yd 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 ca248xri p; cx97au3/.gtvn bi dhy8dqy pacitor and a 15-mH coil in series?t/8p7y;axbv rdu. 29i 3xqych48 ingd

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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 reg)de(n (02o3au*3zfmp j70ff szxvf esonant frequency of 10 kHz?su(0z3 m3npf*xe fdof 20(gv)e7 fa jz

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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 f)a/hnlgtl:r,j.z *y c mm2r6arequenc r ,my)hc g2ltzrnaa6m:.j/l* y of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with t0 9tn.8opjmq a 30-W resistor and a 40-mH coil if the resonant frequency of the circun. jtt0om 8p9qit is to be 1000 Hz?

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