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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flu .z)kxtuuvqs64 c(n,v 8mu2e0klb j1ix 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 indh0pjv5:ugq ( i q:u 6cjxt4p9uuction states 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 co;zriv1zabek(f8tf *gf*-9uiil produces what kind of change on the ind1z-;rfev (akg8t f* 9zbifui*uced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces what7 w96x*kvtnmixci +vb6 cts. 9 kii*v9tx6mwi+t. kb cv9cnx 7s6nd of 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 the indui r tz7nzdz+175 )hcbo 9s 5g0(kheeipceh+idzes1tzhp 70 7bzn9er)c g 5ok( i5d $emf$, 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 q qhngz-c+l (/from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an ir0 t*gz8h o.krr5uq5h dz*3 mcnduced current in a conductor will be that which tends thkr tzo0dh* 5qu.8rcg3 r *mz5o produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizonti/) 3ehzhyj8o9u8l gq al table. A bar magnet is held above its ce8ghy)3oh li9eqju 8 z/nter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horikh;hr ip9edq29 r +q )u-k)joqzontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, kq;rh9r) k-qd o9p+)ue qji h2the 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 qm,xmf rqm 21ry14w;wtable top in a region where the magnetic field vector points straight up. fw1 q1q m 4,rx2mwy;rmThe magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the mq:fv/9 c ryc/:op 6tyupmbbb-2 t m+8iagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is t:b 2tf/ub bryqvp cmpym+ct8-/9i 6 o:he direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic jy p:t t5v629x*p.exljytg+a field points straight down. The magnetic field disappears suddenly. When viewed from above, wha+at:l6v*y pjx5 yeg.pxt 9tj2t is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies otnijfg2si 5aiw7m:hm2:t 8 t/n a horizontal table and carries an ever-increasing current northwardhan:8i g7t5if ij2s2:mm / twt. Two coils of wire lie 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 l1xgw :n 3ebup*q-dh +entering first. As the north pole enter xq1*g pw-d3u +lnh:bes 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 speed about an axis whtkc4hkj v3p- ahn7qq * o1vu8)ose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's ax8qockpnk u4*h)a7 v qvhtj31-is 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 constan7(wk qyj3yhbo5 ,p8*o ws -wuzt angular speed about an axis whose direction can be varied. In a region where bw8( qyp3uw o57yws,h* ozk-j 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.xb ++k w5 tnk8yd)m6kb
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways tha,ti6fjhuwue:a9k( xn :0l2hyt 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 f1m:j g /f pqping3rq3*ield. 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 northward i2j+offuo:q + jt2 p:;gcjss ;b) asd2at constant velocity through a magnetic field that points straight down. Makegissoj)2+f s t:2jo ;ajfb2qpc +d:u; 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 c l2wc5-gtshn6f w31 da 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 t g/jvmrp-q ngo89, u*uransforms

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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 revo.4umib06 twy+ qtkfhwg05a( ilutions each second. The frequency of theuw+wtibqga.i ymh4t 60f50( k $emf$ 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 +o lepg8dad/) hai (r) m pwv-nvagz:xi(3v*3used 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 tha :nl-.4g:2 .e: blrf mdplggipt

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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 loop3y i+m)ft, 1b xbn3cwps than the primary coil tbtbyc+1,f3)n xmw p3ihen 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 primarz4:-pli qb-e)m ;yx 0;e 8pcf)vxrsz hy coil contains more loops than the secondary coil then me e xq0)-i l cvp8f:-rps b;x)h4yz;zit 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 e; * .yl/icriopower 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 resonanle4 vu03s+fan1,j 8s plgy2lnt circuit,

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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 ciap,toh;iwnbx ol z62nr q;r+31c*b8onstant terminal voltage. At the moment contact is made+bh;onnbrpwari 6ciq,1l;28 *xot3 z with 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 series to an ideal battery of car) -0akxmq8u ivjs((onstant terminal voltage. At the moment contact is made with the battery, the voltage across ak)xa(vruj 8(0 ms-qi the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is coe 9.khlj, m/f4nu5o :.tjyz3rj7s ikgnnected 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 resiztkx9 *qbl 9m.yvj *f8stance 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 batpmqa lb 7i dc.dsp+d)to /8a/.tery. The time constant for the circuit represents the time required for the current to reacd+8/dso /ppi.tab 7mlc .da)qh

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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 seoxi yoh:j*gv+l yyhgla,2 4 r o2g1)we955dkf ries to a battery. The battery is suddenly removed from the circuit. The time constant ford2+5 2gifrwx: a h, le hgv*o14kg9lyjyy)o 5o 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 vts/uua pq* *lh 6/)rnhave the 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 circuit, zpjq6*j )*y71xi cy bqthe 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, tf)gmuxwyi,0 c2/ l8vmhe currengv)lu82wm cf i0mx,y/ t

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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 h jhb56h wv.aag4 gdrb3 lr36;circuit changes by what factor when the frequency isdhh5jbrw6va4gra lg. 3bh 3;6 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 thedml3oa9:n2a;gk8 daq AC voltage across an inductor is doubled, the inductive reactance of that inn q3lad ok89mda2;a:gductor

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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 aov)8c xhrn52 ucross an inductor approaches zero, the inductiv5x2vuc) o nhr8e reactance 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 co1)hcx rhqz )p(s pg-*ynnected to an AC power supply. In this circuit, the curreqzgsp)p)(* y-chr hx1nt

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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 wh dc;. ahkvt8/sa2cq 5b.gkr)eat factor when the frequency i8k e.)cbdgskcrth.2a;vq5a / s 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 capacitordv y5tmb+u r3) approaches zero, the capacitive reactance of that capaciut5+vm b 3ryd)tor

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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 capacij kjb.z0 0sd*vtor in a RLd0jjs.v z0b k*C 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 i 9yk55gcf 8jrys defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance oqsaj 7p. +c 7p5d es1/s.ilymi cfie8/f the circuit increases if R increases. When is this statement tdfepys/i7./.ma7e 5s liip 1+j8q csc rue?

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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 tbf,kci;i zage8 s.m4.g-9+a4 uyroju he 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 imcn +/rhczo m8j ly4qe-nv9 f*.pedance 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 in a-adwqg27jk7,omnqg z2k0r qif.1o e 1 n LRC series circuit, the resonant frequency of thatew- zj f0o1 2,dmngkq rkiq7.o2a17gq 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 drivenv6f,zuis(we*0pv4ob h(l ij5 by an AC applied 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 whenb g,ri7pl+rh13b wx5vpw2j h 21qjuc +

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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 rotatinq eah0 owwatogd -1s9juf6: m/*1dp9qg in a uniform magnetic field of 0.20 T. Fim:1gd*h/9f e 1wa0sa-u6oqj o 9wqd ptnd the magnetic flux 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.ye3bhpp3e(dm::sqb1 xp .kx0 10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop bpby m:dks130 (px xeh3.pe:q 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 ro9uq oek6/ zeb3ie0h.ptating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loopb.kq0e6eue zip3/h9 o 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 s8 v rga,gc p(aeaac8.b *c4)daawq8 9area of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil change7z zfu z*6:,9 ziznbgqs 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 txqrq6,7*x qrxwl i7u 5urns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicularru q*li6q77 5,wxqxxr to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns zw*nth tt71 ;:bx s z2y2hi;kjand 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 arevy4gea5ri ay1g8zo5t mz06d 7a $0.20 \; m^{2}$ 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 horizonta-q rrs)o0::yr-n e atqx.aas 6lly at a location where the downward c6 :0q)x. raassy- qo r:te-anromponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m y .idkh6. d(vfe6x)ldlong rotates at a constant angular velocity of 2.0 rad/s abof.kvylhdddxi) 6(e6 . ut a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and,;6jhsvol-g *si*i 1 pyo2 iv(qz3ve c a cross-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 consist+eo/p tpoc3-e w c2gp. qr9q(ks 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 rectangular loops on its armature. E 3-h;/uqm moclach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the lou 3momqc- hl;/ng 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 pt mpi6rcp,72zdoi (owl06c86nxa t3turns 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 out ke;z4y1b77 )pe7 cbwc9pwd gsgwqk9;put of 12 V maximum when rotated a sbyw9bewk9714; gcez;qp 7ck 7gd) wpt 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 gen3fe a8z yg24vr mux*lw4 wd2c:erator 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 6.00 W-ub:hi 8rdzu2) r:wdw.od *n s. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motoc; l/)-s(g t0zpv vqkvr operates on 120 V AC, and when running at full speedqc/vv s0kp-t l)vz;(g 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 vyi9r+ dupwozh)sal5+ 2*4 2c7y bgxi W is connected to a 24-V power supply. The operating currenhiuo2y 9 4gc7 +zda ) *lr5+xwsvbpi2yt is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s;p :j p8z/yb 1rno-jtj+y rk3hupply. The operating current is 1.0 Ajj+bkp;pt/ z1jrohy-:ry n83 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 connected to a 24-V power supm,.(j(4l wyko:j szgnply. The operating current is 1.0 A at full spees mz,y ((kno4j:lj.gw d. 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 pr+ spydbjyf 7p+o)n arze,) 3.uimary 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 r-:. q 46ein gemr)ypaa transformer causes 14 A to flow in the secondar:p iq)age -.ymr6ne4 ry. 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 turnaukk 4;i.o3lbn dt0ct( c*3ejc0l w.f ig ;vz5s are necessary in a 110-V primary if the 24-V secondary has 100 t.lwfnu tc; ev3t zb.ko53(*ic0d ;glja4k0c iurns?

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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 v02bwb9ciz+jj6o gd 7rp6 5wl2000-turn secondary coil. If the currenbpjjvd6+ riwcl 5o2gz70w6 9bt in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a ttj by6rdm;24ph:ng 4fransformer. Assuming 100% efficiency, ho4jgmhp r nyft;2bd :46w many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neo jygy ly/g;x b/vm mqf-*dl-89n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primarvjyly yf*- ;89/-/mmgldqbg xy 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 primary coil and 300 tmz z((/t/vjxa-;m trtn60ik* ilv d u6urns on its secondary coil. If 1/ v(v6ritu6*i; xtkd0nj/ altm(mz-z20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and ; vjy8 5uk+-l-(lmqr5 bhgigg300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present bu-5g yg;+i-qlrvh(j5 k mgl8in 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 10u4ecpnvqo-axw *m2.2 fj2dx, 0 turns and its secondary has 200 turns. If the input current at the prima xao.c-mvqpn e 2uf2xw4*,2djry 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 tur ;/pl,rhh5x(0 uhj-rx -thp dens and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of tr/dx urxh 0; h- p5-e,phhj(tlhe 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 y*c6)c98*s cqs2ydbaqd .d ua secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpu .s 9)u qd2c6ya*cd dqyb8*scat 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 6u ./bu b)6fiijrt/bh) 0 A of current at 120 V. The voltage is usually stepped up to 4500 V b)b/ub /f 6r.tui bih)jy 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 has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A ofnr9 )smi 1t6s: ou bfsez96mb) current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmi t6s o9sesir: 1)mfm6u )bbzn9tted 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 at 120 V. The voltage is usually st r2,(uh7gogi- sw,xzwepped up to 4500 Vwr7,ixos zg-hgu 2 w(, by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long h3okb*k*stt4 sas a total resistance 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 turns ratio of 100:1. What perotssk**kb t 43centage 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 :;kn kkc-xtl4or ho/p r4+(z j50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce lo(+h rj kk:;p/-4tzkrxno 4cenergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6nv)kyv51 mnkhge w)9)-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead onh)g 519vv)w yk)mnk ef at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to b/5 mh8 ollkc oxb7coc6pooo 9n0t -fy(k.)lm4e transmitted on a line with resistance of 0.60 W. To whhlc4 (oc.70 t6k-bo8pnkmf/ 5c)l oxoy lo9moat 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 current8)5q fho+4ofigdg nq; of 5.0 A. How much energy is stored in the coil's magh f5fi o8)4n;qgqg d+onetic 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-Hu,o,hsg9me2inzw +oy- 6 s3xl inductor. What is this circuit's+ inhezxwg96-myus ol ,o32 ,s time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where thqe)1 + boom*zbir.hv9e 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 curref -.w3 .msu0+nftlgk mnt?

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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 ou lwxr h1:a:d5vtlet. What is the resistance of the lamp? r51hxv::l wad

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is thsi9 tm y uqi),gsd(9p2e peak current thri)gitm9 psy sud2,q( 9ough 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 the powe cap (nry1t6,ur dissipated intaryp u( c,61n 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 ifni4q pakq :*: bmcto1oi/36a 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 is:wbm or x1tp:+ $I = 0.80 \sin (240 t)$. 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 isdmt-iru6 lm;e:7c2 a m $I = 0.80 \sin (240 t)$. 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 indi/g2m3j+ zapructor 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 m4ew*+x h.irh 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of in0c +ey*c (b f2otipm;nductive 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 fs awu//feys 3 -d:vf,yor 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC ateo4ih , r0bzt1 a frequency of 20 kHz is b z4o,1t0iherapplied 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 z.wvgsj69 q1 h110-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 y+k)72t/l y y5vtgo secapacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactances ln9aqfmf )c3a+pr46 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 4u1.to(l yuec 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 reactand4 znv5g, f0 ugod**mjce of a 0.010-mF capacitor be 100 W?,4o zu* mvgd05j*g dnf

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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. j4u,,wyrr f ,/wyk/om0 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 res,08he9tfj*j 3m w5vw/ t2kanl kdm7x uistance, 15.0 W inductif,/7mt 5dn kjt8exavl0*uw2 jm3kh9 wve 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 imp:)m m0scj em/xedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sem j0mm )e/cx:sries?

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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-w38g y5bt-k pwm1v fvz;pdw-, 20-mH coil, and 1.0-mF c ;ygwv5 mdv18--tp kf zb3-wwpapacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is cgb e,) 6z5q )fv0uyeqqonnected in series with a 20-mH inductor, what is the impedance uzq)60f5qq ,veey)gbat 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 ind *trbnlexlv xw*z 20k+w+h85cuctor, what is the phase angle at 100t5w +*+xc8vhl2*brx0l wk ne z0 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 an53.a twyoivky :b;kfae 7 *4end 1.0-mF capacitor for a total impedance of 10.e;:4 et ny5vabaio k73f*y wk0 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 capacitlqm08 4alv6 maances is needed in series with a 100-W resistor and 15mlv4ma086ql a -mH coil 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 musttf c c; dxvjm08u5nu,whl 9f.s6)(j ks be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?j9c,5u6f8l;. ch0 vjkdf s(xtm)swu n

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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(4d qinr4q*f y-MHz for a total impedance of 150 kW?qr n( di*q44yf

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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 the i7p:gqieu sf/ds. q )8k ip5e7vmpedanceq.i7pue e i sg5fdsp)8k /q:7v 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 nesd- kt* p:i-qteded in series with a 10-mF capacitor at 1.0 kHz for a total impedancet-q:ikdps- t* 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 10-mF capacitor at 1.0 kHz for a pha*wmx/(cv) v444bs;x zek7t v.gni8iib2bcuh se angle of (hb4i2s8u*.gk xv cwmbne /74xvz; 4)ibct i v$40^{\circ}$?

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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 h897puq z d(shfor a total i7ds zp qhuh(89mpedance 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 :jblvk s2v1 z3:a;vm;+e7f s-namga vseries with a 100-mF capacitor at 120 Hz. What is the phase :v :;sg-a7 mm b av3nvjf;zasek1l v+2angle?

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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 in1-bjhh1mqn ll /.kj2 f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect2jm-k /qj bnn11lhhl. ed 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, and aei0 nlrrokf w:l18z4) 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cuwkr ol8e:n 1l4 ifr)z0rrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductor 8i;goy eme;f0of inductive reactan y8; eoe;fimg0ce 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 seriz(;zd cm7fg0f*7gkqz e2.vb pes RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a z(7f7g0zk*zqmve.d 2cfg;bp 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 anglenrxxq1b 57w3o0kk sef/ k)z/y orqk1 5 yxk7eoxn/3 kfwzb0)/sf $40^{\circ}$ 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 W1z08 lby g+ .wacoc,cr, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximu+y 1ozc8lw.a0bgc,rc m 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 seyg 98bn*pe(tq ries circuit with 12.0 W resistance, 15.0 W inductive rb teyqn98 (*gpeactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC 53yb*wjo tx5 vcircuit 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 6vnf)(oaolyoy r(26s an impedance of 60 W and a resistance of 30 W. What is the powerl)sro yovoy(( 6 n6af2 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 50d(ndm kmakzka4c/k*h +i*hw q3g*:8q -W resistor, a 10-mF capacitor, and q*48 qwank *g( cm+ki hahmkzddk/:*3a 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 ykvs1wrj y u*swl-f8:p5r1 1(bbwir . of a 1.0-mF capacitor and a 15-mH coil in series?1 pkbyr-s ufw.j5ilry:vsb w w r11*8(

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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 resojpjupb * 2l8q h +qen;,e-n7m p0zxcb+nant frequency of 10 ke2 uq 7jnlzepjqnpc0b+xmb8,-; h*+p Hz?

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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 cnlg ;jv -xj:*s)dkp (a resonant frequency k*jj g-;pc vx()nsdl: 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 placax64cf3my8*my wo na4 ed in series with a 30-W resistor and a 40-mH coil if the resonant*4y6nw f amm c4x3ayo8 frequency of the circuit is to be 1000 Hz?

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