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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 unitsqzrto,tfl*5 oq ri:08my z+0y 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 st6 tt) y/o7xiliates 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 9fe4gjnj q) 3bproduces what kind of change on thjbe )g jnfq439e induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wireb ;9iww8qkfo f4g-rkfij;4ju,8d .i o produces what kind of change on the inii 9f8 4og r8okkqwjd;;bif4uj. f- ,wduced $emf$, 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 erk 7d)1-glgh y+ms cxz9qaz3/q9mo, on the induce-3a )9r/zlgh sgec x9 m,dzm+ o17qqykd $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fiel(h;hr29pibgl d4qw q 4:zp n5zd 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 d-p n6 zw4/d j-icskay/irection of an induced current in a conductor will be that which tends to produce which of the followkdn4j/pa/- s-w ziyc 6ing 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 hoa i39 g8vblvw*rizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet igw vb9ilv a83*nduces (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 above i-x;sk9-0p r,lz 1vvlslo g* zkts center with-osk,l1;z-g9r*pkvs lxl0 zv 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 regc. ;q9glvy x87coh- wdion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viev8cxg 9d-;c 7.oyl qwhwed 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 magne8eejbc pc )0*yt.a 76vch a:mvtic field vector points straight up. The magnetic field suddenly grows str8thcy .7pav)m bej cce:a6v0 *onger. 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 z2v,:bbrt mn u-azlwc/8y/ 7 swhere 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 disappn/mtb cb 2r7a8 vusy z-lw/z:,ears?

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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 /3fg8qk/:q sb*b bgg ytable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire.bb:b8sggk3 ygf q//*q 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 wv5l (5yxjosg* x yl9p*ire with the north pole entering first. As x*o5j9ls*(5pyg yv xl the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abxwclwq+v-*y nq-c. w.out an axis whose direction can be varied. In a region where - .*.ycl+cq-wvnqxww 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 speee.0c) bx*kxpli(9yux d about an axis whose dire.i0*bc xelxp xk)y9u( ction 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 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.(jdza3 om,h d avz+(-k n6ez6d
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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 a vi*f:v0n;3l lm z dkw-.bdq3kn $emf$ 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.uv+/t tuud3cz(4y/ft ymr5 *z 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 at a-xp f*k m t/6vfso0o/wqd++ cconstant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosp-+cko0tw +xv/fdfa/ms * 6oq s 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 velociqo vj-2qyghb f.,lt:*ty $\omega$ 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 generatorma;czm9q:8.pug /xv p 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 re7zjawj1 y/ens-6aijd i )3vs/q1 -tai volutions each second. The frequency of the a7svjn6s3 dt/y-i1q/ i1ae )izjaj-w $emf$ 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 us+t 9b6nofefm54g(hmmm. xr 6 sed 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 dev*f8 zal:uflg /ice 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 primah1 t54ftzoz (kw0 p ,3n /j/t*vjiitunry coil then it totk1ju nnz 0j4pwt(3 t hf5//, vzii*is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary coi0vpro zps 4479lpkt ,nl thntksp4opr4l7 zv90 p,en it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powmo brek r hs291qtq,1+er 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 cofymw9i o6+bnwggc,nll8- 5+ ircuit,

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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 serie+)s5 lobio0ve s to an ideal battery of constant terminal voltage. Av o leib+5)so0t the moment contact is made 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 ofm7iui-h apn9.vov 58f hkd(8x constant terminal voltage. At the mompo88 k5huvdxmh i7f.niva 9-(ent 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 rv59hlm g/ /gfyesistance 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 l0ctak4/lr byz7 m :e)u u2ia(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 battery.wn.a kk n6y.t6 The time constant for the circuit represents the time required for the currentntn..wykka 66 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.sbjfuaq-z8u+482 ndr The battery is suddenly removed from the circuit. The time urz8nj qaf 2+usb8-d4 constant 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 unitsc- z:v 6p9xnlb 8m1rwd 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,(ohad *3z f,iil -j8og 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 ci (ohz,n;q7shyowx b i*d 5;eu0x/5t ftrcuit, the curren 5xhz 5 f/u( yt*qe0wbhn,ds7x;ioot;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 circuit changes by what factor when -e joohy ,,1dj1zunb cwtk5) )yn)3p2 ;gdtzmthe frequency o dg,5 nhyepc,n;jz1d2) 3ytw )mk1b-jotu)zis 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 doubled, the inductivaen((r 5utdw da1e0a 2e reactance of thata (20radd(1atne ue5w 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 across :mt 4e kmpn1;:xqi ix+an inductor approaches zero, the inductive reaiqxk xm4;p+1mn e:t:i ctance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In9 u3iqgjd77mx w86uho this circuit, the curre wox6ju78u3h dqi g97mnt

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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 xn22 izr2bil) sm,pq( ac circuit changes by what factor when the frequency is tripled?nqi2s2i,r 2)mb( x pzl

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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 a(algerq wc*;gja5y+9a y :op9cross a capacitor approaches zero, the capacitive reactance of that capacpol(y9+9w*5g:ey aqrjg ; ca aitor

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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 angl8u.6 my8vdczo e between the voltages of the inductor and capacitor in a RLC series circui voydu68c. m8zt?

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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 R evxm d92d.yz1LC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of thenkf2m u:b0 9it circuit increases if R increases. When is this statement tf9 nti2km:b0urue?

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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 i -cfdegrr (2g.mpedance 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 ci2 + r/mogz-p2zu,qbugrcuit 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 capacit 4 e2qu- kli:kr+pr4blance both double in an LRC series circuit, the resonant frequenc -4i:b2 4r+rklplqke uy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At rebnk9w6f (4vbw sonance,

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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 oait;j qg *6 aw*yrs,/qccurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in *8e9noeyf b7y ;c mfh)a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whene 8oybf9 7)h ;fecym*n 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 radim, k2 cyz qiw7sj*2v4bus 0.10 m is rotating in a uniform magnetic field of 0.207bkjwv 24s ,2miq c*yz T. 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 rotating in aav0 e derisr81x 6a)1e uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plas8)iex 60ere1rdav1 ane 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 r eh1r d6(nmdz+g5y v*8f 8e cimzw99cheduced 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 coill 6(evzuz:4 jaj- tj9r changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sid49o+o ybtz0 xg1/wdx h y-wo9ues 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. z9tw 4yxu1-yx+w dh9g/o0oob 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 turar kl+68 (0l dlpfx/jjia qkn4rg w-hpf;w188ns 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 ar i3 rre6d3vu:tendb ),ea $0.20 \; m^{2}$ 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 lh1h)o5+mhvtx-g)ai m flies horizontally at a location where the downward component of the Earth's magnetic fielol1aithg)m 5)x hh-+ vd is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular djczkj*b2e)v 2gw. q1velocity of 2.0 rad/s about a vertical axis through one of itsw *jebgq.)d1c kz2jv 2 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 generatorg z-rvz3xbe9vn6og 2, has 50 loops and 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 consists of 11zdt2m 0 mxv3y00 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 i2c .nkq4si x t9b.r-mnts armature. Each loop is 12 cm long and 8 cm wide. The armature rotarc i.knbx-9 t4q2snm.tes at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100eul2lm 6 pz0ond t. q-g,4r8py 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 wid +mb gqtg)f--th an output of 12 V maximfg qbd+g-) -tmum when rotated at 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 generatorrj3: b9g9mxab 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. The motor,-fau daw5f/x operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates onk.q 3s- 61zymddhq/qp 120 V AC, and wh/ qk3qdhqmdz. 6yp1 -sen running at full 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 resistanc+z:5u9 f ucy mba-d+bpe 6.0 W is connected to a 24-V power supply. The operating current is 1. a+: bmufdc95+bzy-up 0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. 4m a8 :w*s4jz(7 nbelqy6fo x kdikm;f+qc:,jThe operating current is 1.0 A an,;d+mfqxk6z:4wsa :c( j7kf qm4lj8eoy b*it 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 W6fcvs ) dw2triy6 9gw* is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back 2*ictw ys9g )w66frdv$emf$ 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 hys/5m6h a.upv 7riy4 primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer ( jyrbkxu25 b:causes 14 A to flow in the secondary. How many turns are in the seco bk 2xujr(5:ybndary?

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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 n8q,; ky0n phpp8bdn,110-V primary if the 24-V secondary has 10dk8n8nb,p,ph py;qn0 0 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.:ltkqik/95 /uu;+* jbmid b hto-mv a of a 500-turn primary coil and a 2000-turn secondary coil. Iv imo:ut ba./u /dtb;*jqiml-kh59k+ f the current 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 x*lw 7o2z fyb pu+0ta/a transformer. Assuming 100% efficiency, how*0po uy lwfz b+ax2/t7 many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 75vreh bu3um :f 6f3a5;g00 V at 10.0 mA. The primary co v3a eh3;r56bu:u mgffil operates 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 h xne zun+oh/7vbl87: 1 r,ikqlas 60 turns on its primary coil and 300 turns on its secondary 7:/o ,neh+8xk7qlr bul invz1coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 3 a w xnkory,rkc9b6abppz/2i,/9w66o 00 turns on its secondaryb k zr pi6,/ r6wbkw 9ooax29/p,yn6ac coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. ngc q5c:m dttxq.*b7+iv* d i*If the input current at the primary is 100 A, we can expect the output current at t:tvdc*ci 5b*.gnq+x*7idm qt he 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 anlh:wozxsvg p;(e8i 21c;g52wf 2mzv z0 ocf s)d its secondary has 200 turns. If thezz f:vhvom;2f)wc0s58 gxe2p go 1( cw;s iz2l input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secon)5bshn)3bv/x 3 t ngskdary has 200 turns. If the power input to the pr)5)/ h3gs3 n bxvstbknimary 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 aee3kbm :nd+g+s1 p-it8gsgd.y ,nw 7wt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of twenn+ds.pe:+8stmggbdk 7y- g13, iwotal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V2teryvb0v 8yj8dr q92. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of y2 2tr08evbjdv ry98qtotal 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 usuallhp-5f+6b e cb zly n4 hin74upq mhw.)0nemq4.y stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 qn+-4p4hme yn4fbqehz.0 m5l7pnu). hbw 6ci W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has 5ym-.nt 5d2 acekj/njg2/ anu3uye 3sa total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to5/2a3nsj3y e ukmeu2.ntg5j dcy- /an 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 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 csy:fen4;ggs :a0g/;klx :cua total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce ene:yan: gl/;ggc ;fk40 xeus:scrgy 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 6-W line at 1000 V. How much less power would be lp yoigvodk.(gs 5/q6e 6rcjfkn * l /h1cqj.4-ost if the power were transmitted at 3000 V instead o yo gjk-sc*qh5 c k.(/4pi16 /qef jol6gvnrd.f 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 generf 4c.r pojymub 1.0)ynator is 440 V at 20 A. 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 exceed 0.010%fpnubymo.c )4r 0y j1. 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 th +p+8oj.wzmttd (xyx5e coil'w x+ dzjyx 8otp(5m.+ts 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 resistor and an 18-H indug l (-xu+ha0 abmx*dt.ctor. What is this circuit's time constb+(lu0ht * aax-m g.dxant?

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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 inl0cisx/ e/y6y 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 curr;hys, z+zac1 hf)(9au*o3up w; sxo kxent?

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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 12y9w9hyqnixz47f zf+ :0-V AC outlet. What is the resistance of the la7+yinyfw4qxz f:9z h9 mp?

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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 )i42zz;+o2v/ zfs g+p(d aomvaa p ax4the peak current through the re a;2zo4ixao a4)v gfz+mp( apvz2/d+ssistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power eu/whk;6zpv iq tm 9cz1a60+l dissipated in t eqacuk;i6zwp ml16+h 9 z0v/the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50pq; 0.nf p0k0ltwot.urz+*2tmbk: nt-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-kx.fqkhqu6m-+q :n v37n) owkW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist-cnim-a/ mkxm yv*(:7 dr p:etor 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 ao4:8nxav*k-gdzs w i8lk ; u:kke9fo,efc8 z. 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil0 9 m xjsawqmjw4-q07q 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 ito o* 4 pyaaq8 u5vv4s9cb3n8dnductive 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 157 W of l,6m*.dc z-ursq s, hpinductive 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 vjdl 8gmij2/: qq8)ai1o 1dug when 120 V AC at a frequency of 20 kHz is a :o lvgiqdj 8)i/ 1d1q2mjuag8pplied 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,7cftp;n; f1 tlx maw7.9 io:.nlsa9ws 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 capacitiveonzpc0 (*wx:m reactance of 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 hu2 k5kz8gpb( *zkr)k qave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120 kpq1jixt ,+7-hz( h qz3l5wij0 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 wild(vnp4 a3/wfv l the capacitive reactance of a 0.010-mF capacitor be 100 W? (34pfwva dnv/

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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 wud /qemqbmqxsi f07-2+y -;brp -qn25.0 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 circy vf;1(r7 wn:dttghm/uit with 12.0 W resistance, 15.0 W inductive reactance, and t :( m wyft;vh1g/n7dr10.0 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 impeda)0qwt7xwuqo0; )bv*iv + jhlgnce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ov txww)*q+ h00j)l iug7;qbv are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 aep*xy0 ) s8xfHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor8fxsxy )*pe0a 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 connected in series with a 20-mH inductor,0kw9drs j3 h4t what is the imped4h93r kjt 0wsdance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is vgat.wi2 y8/6pv1 kk oconnected in series with a 20-mH inductor, what is the phasow /y 8ivk 12.ga6vtkpe angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit,jsw)tn;s z8 l.0hk rf with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W.0,z s)wt8ln;hfsrk j 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 +1ggioch 2/z w7o nw17irwe m(needed in series with a 100-W resistor and 1r g11ew( z7 wignihco2 mo/w+75-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 must be put ina onue1w5al+(i:/y c1) vtjw a series with a 450-mH inductor at 5000 Hz for a total impedaa:e1j ) wo+ vl(itauc aw/y5n1nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for p3qn fag(7;lr*jw e8d a total impedance of 1f w d a;3qegn7p8(r*lj50 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 serirgn,w2)8ffj y es with a 20-mF capacitor. What is the impedaw2g8r jnf ,yf)nce 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 needeqv-h5 qlnxym8zjttee.cd- *7 4.. dcqd in series with a 10-mF capacitor at 1.0 kHz for a total 7cjn.dx qe h.-tc-vzt*84.d5eq qy mlimpedance 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 r1lo lm,367k lpoa:g gkHz for a phase angl lora3k,:1go 7p6lmgl e 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 neededll2gm (pv;sqht0ph*x sd s;i , n6ljtox598d( in series with a 30-W resistor at 1.0 kHz for a total impedans;l (9s(;v85nxhq dt2t xj6smp hg o,l0ld*ipce 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 15j8u/chy 0ri1mdgsx0 f3q dk,00-mF capacitor at 120 Hz. What is the phase angle?0rxu18, f5sjq kdc/ y3ih0mgd

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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,bjz(-vff 7 rhrbyvz6p3-1ku ( ak o41k 20-mH coil, and 1.0-mF capacitor are connecfv 1zpf6yar-ur41-z j v 3kbh(bk 7(okted 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 capacitore 8(g36bsll rflp5f1f, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms 8pl lrl f3(s1 5f6bfgecurrent 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, s4)nrws gwt r.cgbu+5ko9 *o)a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in tw cgb9o4to ug .)nrs+wks) *r5his 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 circoy6 6*3jltx3u( nfyw r4b3 kzxuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect6w y oz un3kx 34fxyjr(lb6t*3ed 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 xmn syl.ny83a s(mo8dfe-w1)phase angle ols -m.f wa(nn)yxd8 e3yo1sm8f $40^{\circ}$ 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 h88ddy ,catw) gas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven incywa)g88 ,td d order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resis0ab o,73 2 o lk9 sev2/fhw px9z00ue5wswasljtance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cons,w7 u0xfw3h2520oa/ sjl90 abkpz swo 9 leevnected 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 a)j 1odnvk3:nst(khj7 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 cw*q fmj) 0h-ped6hu qmh-z5x4 r(okdg 9k+2jof 60 W and a resistance of 30 W. What is the p4j-kd) kfchm6 -xq +mhh*j redq5guz(092wpoower 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 factov:f ry9c51: xqlbx6xhr for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-9: f:6b5ylqx1xc hr xvH 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 capacitor and a 15-mH co)r uu; -kiq,ovil in series? ,ok)uq-i;ru v

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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 capacitonpq;habv, asys;)s 8+ r for a resonant frequq;as+ph sb,svy n8a) ;ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-m3e+k ldqpz+b:H inductor for a resonant frequen+3kzd qe+pbl: cy 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 a 30-Ww9bx* it:s /f4ouu. 2q srusv* resistor and a 40-mH coil if the resonant frequency ufqu*9i sst42. :rv/ow s*uxbof the circuit is to be 1000 Hz?

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