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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 unn nctmn, : s;.i9xe8tkits 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 states that th3ji6i ::eh/313 io7svpnij1mz sh eyve $emf$ 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 fef:i0 zrh8kv 0pig3:of loops of wire in a coil produces what kind of change on theef0zf:h3r 0:pikgi8 v 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 wire produb4dn4cq3qp 3tces what kind of change on the induced3p4 tcbd q3qn4 $emf$, 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 diamete1o.j pkcooa1 3r of a loop of wire produces what kind of change on the induc.jo113o cpako ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a moo nidnww079s.j3.dev)w7 yq agnetic 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 a;i )ox6oq 7prdn induced current in a conductor will be that which tends to produce which of the following effects; 6xrqo7 dp)oi?

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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 hordqjqlk lb7g.tj/(b 7 7izontal table. A bar magnet is held above its center j .ll/7td jq77(bgk bqwith 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 horizontal table. w-h.kumf16jd y3z 7kvA bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil,wy 63v-m1juf7 . zkkhd the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region wlh+pv.b a-mgi 5wj6v( here the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed f(i pm -hga+b65.lw vjvrom 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 prg vvpyq */5 h9u36tlwhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current irlpvv tuqgpy/9*35 h6n 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 z;ba;.a 4x f6 eyj+phgavgf-bd* 6wv -top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced gab*pvz+ -vxg d.yw ;;6h-jf6 fa4 abecurrent 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 idovphpkp9g0-01)bmtqws3qe jh;8, lb(e *rlies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie e;-eqqw 0b( rhdh8 k0l vomist*9p,j3pb p1)gflat 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 throu w)re sw)yjzfq;e,):nmmb5/fa9arh :gh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced curr/rwjfmhrm))z)e 5bw q nay: :, ;9sefaent 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 a 0k4fyuq9/i /bwen-xnt constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatio kby4- uiwqfn 0/x9e/nn 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 constantj/ :mn iz 9mlwmh04ro3 angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced i/:rm 0 nh4z93low mjm$emf$ 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./ *ntnah3 9xg.x5gebg
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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 thk7q:o i;itz+)xldi6n+c 0-+prqxjdt at 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 49z4 a/7 mz)bvkafpnoa magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in tq :k eabki5q47yov5)vhe east-west direction) is moved northward at constant velocity through : oayv75vikbq e)k54 qa magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates ;n 6-z3snkxwh,c5 das at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformmxu bk0sg1/82ywc2 qfjpq97 es

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions rtqosc5p6 06h tq /utl411rc jeach second. The frequency of trutqj cth1so4 0p/5cr1 qtl66he $emf$ 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 usem. d0pasoza73t2epe 9w-5g bfd 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*y 2 crd0s7zert

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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 chc++mt nvq v xi3k4s3nwi()/g ontains more loops than the primary coil then it im3gc+ hv)xtk 4 (/v wisniq3+ns 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 t6w ystqwa ( 0x 6zrkkr ,pqr*e1kf*b:7nq/k0ihe primary coil contains more loops than the secondary coil then ir sk*z wbp:0eq tik (/6*qkrkxn7 rq60af1,wyt 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 inr*. ydpuo m,ways,d 7e,+a8power 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 circuifwh; k3 8)pobwt,

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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 inductoy3xl cpj 76ye/svu+3gr are connected in series to an ideal battery of constant terminal voltage. At ts gpjxvyy+ eu/l3c76 3he 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 are4k+70srgpc b9s 7ez wa connected in series to an ideal battery of constant terminal voltage. At th70cress+7p kwa9bz4g e moment 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 resistance Rn ob,og1f*t5gy ; j6sf 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 redief0 ob8e 27erk x3;ysistance 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 t/-:mwda3+)kqqndn ep *u2ojho a battery. The time constant for the circuit represents the time required for the ndd +mqu*n3/qaw 2p-jh )oe: kcurrent 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 inductonppx)/nyfd c9/6 0rjx r are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the currpn/)6cdxx n 09pfj/yrent 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 exceo-frivm; ad*tw yx02avsn7 )) pt:

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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 thxm6o :cbv.a6yis 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 powele/pn aofquz2njp +l+ - *9/twr supply. In this circuit, the current lnpu n+t /f j*+/wpeoaz-92ql

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanceh,+huz 6o*0lmlc o rg3-(rfwa in an ac circuit changes by what factor when the frequency is tripluhgch+olzrw lr0 36,mo*-a(f ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the 3 p0 7 cvi*h(v4pnv.5 gbutvivinductive reactance of(vu30* pv 5hncvvp7 tvig.bi4 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 across an inductor approaches zero, thee(;v yimd qp.7v wvohk) t*2)u inductive reactance of thd7*v)vw;qvmky 2 upeoi.t h() at 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. In this circuit,a9h 1gu sgkw44 r8fpy, the currew9a4gsfgk 8up4y 1r,hnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when d42jp0z e 0qfsthe frequency is tr4z2qs0j p0 dfeipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, th 8l+ohfso3dit)y6 )e ee capacitive reactance of that capacitd6f8oyh ie+3lot e s))or

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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 capacez4/ nvcvpk:rf-7h(4c c)rvgitor in a RLC serier c7z chge)f4vv n-/v4rp:c k(s 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 Raq h)6/n8fd drLC 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 tghu9r0g+ dohwgxs y6-9gz)e1ov .0xkhe circuit increases if R increases. When is this statement trsuz d ev-h 0)hx1ggo9wkr.o9+xg6y0gue?

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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 orxg5 / mut z)o-f7qwp.f 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 thvdzzg/ s+cvy (x2f;aud/1 :ire 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 an LR lyhxr ;:h13 +3 ,+au grwxe,ubxlfmz(C series circuit, the resonant frex3e u,1h( +lb3 amw+ruyl:;rzfhx,g xquency 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 thatsu a 0rn.7 b:uwz1ebv*2utrs + is driven 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 occursx 8 p6rw:adtpwohq493 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 a uniform magnetic field ofj(i d5fe0jc o9 0.20 T. Find the magnetic flux through the loop whe i9 (oje0jcd5fn the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m*.3-z kal-hm w fy:ukbz9wal8 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux t3yf9 kzl- :k awa 8h*u.blmzw-hrough 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 a uniform magnetic field of+n ;lqpo42rays zq5 h: 0.20 T. Find the magnetic flux through the loop when tq z2; h54lorsyq+: pnahe 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 sinu55.h7s7b4 oqxdcx*n *q wvmzgle 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 ch j*f7kmoaq2 b2anges 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 /md0j qhpu y5gt7:z8p a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the 0pp d5/h7qgz8y :utmj 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 r :h ynw f:k 5xto1 jlvsi,2xhj,09rq/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 x0poj0r0,u xnarea $0.20 \; m^{2}$ 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 wing3ealh okd.g+;.sgu4wab ;x)g span of 60 m flies horizontally at a location where the downward s kg;o b;).e4uhd3 +g.waa glxcomponent 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 long rotates at a constant angula *u/t3ys5lmr. djr84swvo p :tr velocity of 2.0 rad/s abouts 3ld:st*r.vt p 5ymor/uw j48 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 cross-sectional awp bcr,t-5n ;krea 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 wt ,vdi w*:+ta100 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 1 3haqch4l2aw,p qjy)on its armature. Each loop is 12 cm long and 8 cm wide. T32qq wy ,hhplaa4 j1)che armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of e z u ux:v/ib3 ,:6n.0zj n3strwvkxe5100 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 output o2t:rgm lsl 9w,f 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the gt2 9sllw,r:m rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a mxy iq6 ;:).qukmvv* weaximum $emf$ 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 opsrjceufys- 60hb9 vt9: gk s97erates 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 oa6xfolep9/) q n 120 Vq6 fl9)x/oe ap AC, and when 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 internalvab dpim-ntvm2-i j8+0 d.n5 l resistance 6.0 W is connected to a 24-V power supply. The operating currenmiln tp25ni ab0v.- d8 vdmj+-t 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 resist2:28aclbln8- t / :w: otpotla9lgjvhance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What i9p vlaw2 tb ogl:8ocj2/al8-tl t::nhs 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 connl/ c0y9zdnn9vsi5 p,u5t9lfm ected to a 24-V power supply. The op5l n/idnct0f9myu59l s,v p z9erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pritogi5wzu ;j;(cei fwsp7n* 6h)65 wn(u -dnkmmary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the sec/ode h;l *t:pkkboo+0ondary. How many turns are in the seco/db0 o+e t opk;hlk*:ondary?

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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 110-V primary if th;y06ucdf5,b vm h-tdjzjz:6 s e 24-V secon6dtyd ;m b0 j hjz:5,z6vcf-sudary 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 oz.xb4 )d+ udwand a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current id+).z db4 owuxn 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 trans9mdx79b2j3 vvdu*bk. bq9 iylformer. Assuming 100% efficiency, how many amps at 24 V can flow in 9vbbv9 d 2qb3u .*j7kim9 ydxlthe 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 transfol1yq.wk- ol0mo9oa )hrmer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What d0k.loolh-w9q mo y) a1oes 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 primary coil and 300 turns on 36mxtie 9(8iskr+ezh its secondary coil. If 120 V at 2.0 A is applied t t6k3mhe9iz(+e8x is ro 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 300 turns on its *xcs2*dk hz:b( u.pwc secondary coil. If z(**pu2kc: wbch sd.x120 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 t tdyl,-nhq8 /r2l s9jnurns. If the input current at the primary is 100 A, we can expect the output current at tt8l n9qynd,2jhr-/ ls 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 and its secondary has 20064-8ds9cxuoiqp z vuv e( o7,je)x(x r turns. If the input voltage to the primary is 100 V, we can expect xuu(c9re vio 7 8 4jpz-o(dv,)xsex6q 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 seco3g1h)x cxd-j undary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting3ujh)xg1 xcd- 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 usuxe36wdouzl -op9 e,r7 ally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 td9oole3u xpr w6z7e-,urns.

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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 omn1j68 hzq o5v2sf v8tng6:k ls+z2lA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost jz ml 5ol :skz28v1n2h+got68sv6fnq 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 ug8.uaux9b t9wh91 7hb cqhwa)oa x k:op3ej.(sually stepped up to 4500 V by a trans7h. x9th3w ap 1q .wx bak8uochae)9 jb9(ogu:former 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 has a total resistance of 0.6 elvq y /ui.rphn1/a(2up6b( zgb7 )ww0 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 percentage of tpga 2qi7wn /v(/ be .brl61) pyuuwh(zhe 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 resistancemphi,f )/; azz 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 tr iz m/zhp,;)faansformer 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 lessrwk dtco)+7 ziviw 27ucq-5+s power would be lost if the power were transmitted at 3000 Vistiuq d w)v7cc2w+7r o5-zk+ 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. It is g +ao(e4yf z+ey:su)q to be transmitted on a line with resistance of 0.60 W.e( +y qof+) ae:zg4uys To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A.ye;x1rlfs 1.,xx8 e r)ilrp0 7xi9ldq How much energy is stored in the coil's mapr;7i i y).,xef lse 0lx8xrd1 rqx1l9gnetic 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 containih6sp(t cjt;;s a 6.0-W resistor and an 18-H inductor. What is this j6pc; htst;(icircuit'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 etw50tm7r,gw jm0,czdl2gw np3hf1 o x2 p)- iin 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 intqjs dzj j4 i otrn).17c/44fvno a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance otha; p*.nbqi*nrk: a.f the lamp:anht*q ai rn. ;k*b.p?

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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 the p2 1c* zbg x3laziw7.rheak current through r xa.3bwizlz *12g7chthe 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 power di: g-mz6ztss fp rt)3.l4 ,o8qja/oxjxssipated i-rz6sjtmztpso j lg. q3xox 48:) f,a/n 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 k3f9 9a5dk42l n hhnssa 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 resiso1boy2uhp62+ ag* tqitor 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 res83q4m xdkw6q qistor 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 indu,rml:vf s:pb, dft, d63e5uw47u dp rqctor 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 reactad:k-)4 p1r/a0d h-q t:ixj xpg;nqhyc nce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have5 ogw (zve2(zz 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 157 W of :o7,/ 39sgdtc3 blk wrhc/pe winductive 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 at az(l (+(2tl0cr ghivmumgz.fh.1xlg 1d bc6x) frequency of 20 kHz is applieb(x0 (+ lhg1vzl1mm)6c i2 t.g.cz(xgld fhru d 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 tt 2gtycmpx l6zb/. d*-o a 110-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 (;4stoj cd9s btiljbo3e* :u; 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 haj.1ifg *pub./rlww8qu i1-uive 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 hav)eeenk1 w;c4 te a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the 6qt+n 1zjk9omypjq0 6 capacitive reactance of a 0.010-mF capacitor be 100 Wqn1 tpjj6+ 09qokyzm6 ?

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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 capa5 /kyu3,vzp :nmzibh* citor 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 resist:gez cldc9 ,p; plu+shyj /)5oance, 15.0 W inductiveo+9ed j;lc z/uhc py):,pg5l s 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 coimwgv2 k /qk so0u+a5/ jprmd ae87ko09l, and 1.0-mF cek 5 s8m jo qdr70ga /vawk/kpom9u20+apacitor 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 Hz if6(rp z+kv bi)c/0hv koeu.u7q a 100-W resistor, 20-mH coil, and 1.0-mF capacitor qveu 7)v0kior 6uk(pc/.b zh+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 resistor6e jzk wg/el0- is connected in series with a 20-mH inductor, what is the impedance at 10 60wezk/ l-gej00 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 seriec o.ld* w91ssms with a 20-mH inductor, what is the phase ao l1*smdc9 sw.ngle 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 with a 20-mH coil and +dwdsk1)*. hvhu3fqwn (lsn:(: 2wy3 lvozrd1.0-mF capacitor for a total impedance of 1002.vs:z:www u v f )3dyl*+l3sr(hdq( 1dk onhn 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 100-W:yqd1bkx ) (iffk5o owq 4(wa h9et;g3 resistor and 15-mH kqkqfy4awo19 :5eidg);x(w tb(h 3 of 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 inx2 cqw h*da0 e*0c8rg/rnfnc9 series with a 450-mH inductor at 5000 Hz for a total impedance of 40 2h c8nrgc9qcw0r*f*0/x dnea000 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 for00mn4xazll + l a tot0a lz 0l+nlm4xal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What i)l 2;xk o .l)thbz)bkh- 3cffws the impedance at 1000 Hz?)c-f zwlfh xo.ltb)bk; k 3)h2

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need/xe af(mm1y1f /qryss 50; mcoed in series with a 10-mF capacitor at 1.0 kHz for a total xy0r(m1/as mo /5yf 1ef q;cmsimpedance 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 kH .vou/o+sfvx 46 r)rifz-nxp5z for a phase angloo+-xxnu6v f)ipv.r z /4 rsf5e of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a ilu2ucuot0. :30-W resistor at 1.0 kHz for a total impedance o.ci2otu0l uu :f 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 100-mF capacitor at 120 Hz. What is the.euq-yr .r5fl 6.gp;kj(t wjr pharjygr 5r 6eu.. klt-f(w.jp ;qse 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 coil3bxhmhhxo,;* , and 1.0-mF x hh3, o*;bhmxcapacitor are connected 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, a f42m)ej53mgoeix)aa nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the 2m g)oi5xj4m)3aeaf e 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 induq)oqabg t1*4syc,w/tt z() lc 68v+zkm 8we atctor of inductive reactance 30 W are connected in series 48+atzy q/ogw )1zsetqw actcvkt ,8*m)l 6b( 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 .s sph)zu* xw9 gb+nx,for a series RLC circuit containing a 50-W resistor, a 10-mF capap xz9gs)hsx,nb+ .w* ucitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phaz ,fo(m axu(/tse angle of (u/a, tozxm( f$40^{\circ}$ 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 =)o )u)p +u(o:e1ozemvho1jt t 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powe()1eto)1 pojz e)uhvto :um+o r 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 w8fm p,xg c0.raith 12.0 W resistance, 15.0 W incp.r, f8ag0 mxductive reactance, 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 an9/s:u7lz u. npzo1rjg 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. -g .aen5kj: eq What is taqj g.eke-5:n he power 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 containik2i 1 ifntj7nm,khm :.ng a 50-W resistor, a 10-mF capacitor, and a 0.45-H ih 1 f:2nm7.tkj,kni minductor, 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 resonantsv (853aa+y eih9ml i +sjl( qxp9:liy frequency of a 1.0-mF capacitor and a 15-mH coil in series?93slieil j ivlhmy( pxaa:++ 5y(s9q8

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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 resonant frequ2y 2 ccz5ohq x/iom63uency c o hi56xmc yo23/2uqzof 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-mH inductor for a es2k:vy -f (gvresonant frequency of (vvs-2:gfeky 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-Wq fw1p53jyp*;lj8rk xr7:gbb resistor and a 40-mH coil if the resonant frequency of the circuit is g pq8kx5*lwrjpyj:b; r17 fb3 to be 1000 Hz?

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