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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetr y 57kge*i+oypq4 8cgic 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 thw lo6b4jqwe64 e $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kf .t10ngoln +qw0q;k dind of change on the i+ qng d.;qo1nl0fktw 0nduced $emf$, 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 ofxl.i -x2tqv3 if*flr - wire produces what kind of change fxqx til-*2fr-3liv .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 o)6zs 1s645jxyde0/b y -swm tssjc ,mwire produces what kind of change on the inducedd )c mozss-ybss 61jtyj0/ 6x54mwse, $emf$, 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 frxt t.m 1hwa,donm /s1lokx2 /:om 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 ;gclqt) u248b8wqh2)pqs gu6 dsu *kelaw, the direction of an induced current in a conductor will be that which ten 6th q*;q )pq2sd8b )ule42gukug s8wcds to 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 horizontal table. A bar mag7 qsx.,v: pcgonet is held above its center with its north pole pointing down. The stationa x.gvsqp,c:7ory 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 fl.);ss vl siik:1ds35 ofqnugke u6k3:at on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it 3i: u3 qlg ssf6 1usde)nk5; siok.:kvapproaches 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 regi3lyb a 8h60ggdon where the magnetic field vector points straight up. The magnetichb8 3yag lg60d 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 tmw gdah9a /z rr0;(,xi)s jj(eop in a region where the magnetic field vector points straight up. The magneticxm sijh(rw09) za ;d(j,gre/a field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where tho 3yn3tjq5x 2 wc50ghoe magnetic field points straight down. The magneticw5t oon2 03gjhc3q5yx field disappears suddenly. When viewed from above, what 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 bzbm/4qc7 :b 3(dw7wh6uz c npon a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on 34z(czcb7wh dunwb76qb:/ mp 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 j/z3en1eq1q4dza q3a of wire with the north pole entering first. As the north pole enters the wire, the induced current will be3e/3qajzd qqz41 a1 ne (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 const*lb,ixjc 2 8szant angular speed about an axis whose direction can be varied. In a region where xcj*lzi2, 8sb 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 angulwz+ 5fp;z6ghtf ;r le,ar speed about an axis whose direction can be varied. In a region where a un;5;gf whp6+ zrfte,lz iform 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.nj u* b(56avpo
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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 gnoq*4vqq3bl q ok*+ *that 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 ur0a .ejj a7k04k;tbqmagnetic 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 the edreg 9b.gi x:1 mx4iqunym 546ast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indnm5x qg9iuym416.b gdei rx4 :uced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocityah( 9-4ynyt :/zqjgyh0 t ule5 $\omega$ 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 ns1dli 6x (p4atransforms

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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 th5jj3mlml oh dwqwhnrl 38uh*6dq :7/(rough 60 revolutions each second. The frequency of the wo5dd8hj3mhn r7hlq q (3m6:l/ wu*jl$emf$ 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 us0yr nli4 5.fmkzx (n0sed 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 thatddw/ tssbsi7 17w-eo-

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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 th4 oya,rpmtj-ae.2l f+an the primary coil th+ftlyao- m2 . pej4ar,en 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 primary coil contains more loops than the seco4y 1fk gdu-aq/rb9x5 xndary coil then it95f4q-g/ adxy1xku rb 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, them p4if6lu cd8b0;4j ntxecvan, 4dz1 7 power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circfe94+tk.fzwo uit,

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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 series5ww t5 uf7-tyb to an ideal battery of constant terminal voltage. At the moment contact is made with t t 55tuywb-wf7he 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 idealt b3 r.lbalw.-w. gbol34el iv 0d-b4j battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thel.-l- r. bab4jivd3lgw0 lt.bweb34o 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 connectedo zxfn5:(76ax a2edoy2wt5 u 6rx-qyu to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is:2)b-fnugim*yb,,mm xn-uy r 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:.(xde9 dfzf h are connected in series to a battery. The time constant for the circzeff.x(h :9dduit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batteryw3+alu1*vjh i is suddenly removed froma3hvj*1wi u +l the circuit. The time 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 samem*,w2hxpr 5 d t+cy:9fk4q-c1q-dde z6k iqij 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, the currek boq yovg*3,3h ptn:1 x+het3nt

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curren dt kppo /* zx(740ru1apqu*+7zgkix st0t aog p*(d x1rkzxkuq+izup 4p/s7*7

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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 ac1jb9npp )h+ fu tojk +jz:8zb1 circuit changes by what factor when the frequency is tript )ouj1++8jkzzbfbn ph9 p1 j:led?

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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 inductr)w1 oi5 )1m, v -;83h genvnljramwsrive reactance of that induc); wrn l omiwr5rna-11megvjsv, h3) 8tor

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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 b zrqqtp4) zx5mr-j- 4the AC voltage across an inductor approaches zero, the induct5xqqbj- -4zrp4r)z t mive 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 connected to an AC power supply. In th sh3du k/wa+ 2ri5yfc2is circuit, the currenthaf3i/d2 s+r kuy5cw2

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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 c6ji,s tlln9fpe1-/:c l9zs hcircuit changes by what factor when the frequencsi6:sl c l1nptl9h9 -,fzc/ejy is 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 r-,w -b;set6m wxzr)).dykpl voltage across a capacitor approaches zero, the capacitive reactp; - z-. ms)wl)tr k,wxydreb6ance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capac na1myqp 6*1wyxzx/ )z: 5l74eomvksa 1d8pbiitor in a RLC seriesv7ya mp *8m45zxip w zl/ny)a1d 6:oksb xq11e 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 a:n;; lhdm s5zk n3m2sdn RLC 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 the circuit increases if 0:fi iu,sd/+uwazx : bR increases. x:a ud/if: 0iusbz+, wWhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circdtjeu7ub 9vtylto.v u (q(:tijl)h+5d)g)2 xuit 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 impedans ow q6gehjl0e3u(*e1ce 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 inyqek 7p)l- ik9*pv2 cs an LRC series circuit, the resonant frequency of that cicl 2 *yiepp 9kks7-)qvrcuit 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 .y)et3(tevgr 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 RLfv,k ex*pv 9)oC circuit occurs 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 radiu j mggpib6u,0a*/7 zsus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pazgj6 u/p,gs*7mi0 buarallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in 15q ::b voud:*hkgcxe a uniform magnetic field of 0.20 T. Find the magnetic flux through the x5hvd::kq*go1eu cb: 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 magn5,a0xxzqlp1 j etic field of 0.20 T. Find the magnetic flux through the loop wp5 ,laz10qxj xhen the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single looyb*9+sh1ovb 5 ie*5sp rlej+ gp 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 coil6dbr/c9 an*a.v5sk;hyhh7 j s 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 orw/4ov1 ai 1dif wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes v/r1 a dio41iwuniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of qtl *(vquk4 c2$0.40 \; m^{2}$ 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 aremm( 1 uyb7fy)la $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locationh0grrgj7i xkh546j- z where the downward hz7h5x-gigjr0 jk r46 component 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 angular veloc2t3q pw6t wa+qmohf48kd8nl, 9: iyu iity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiely+qwl pi8f3nko timhq92:ut, d46w8 ad 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 cros 84y:k w;vglmvs-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 100 turns of wire of 3 2q ov4yvdc u-ej.tz9area $0.090 \; m^{2}$ 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. Each loop isd+;lrv a 6bpdk(xl,f bvc+-/s 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loopl /fx p+(dkdc-sr v;6b+abl,v 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 turns of wir jngb+lk; *;yonvhf-3gb8ny), 3e puue 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 tf iywmj 5d/-*construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avmyj5fd t*w-/i ailable. 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 gs j 0dk8xnh8ku(qgq q6ef;25fenerator 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 resistancoh(zmjdd 9zx,o yt451e of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC moti pkowp/)2i:e2 v6fyior have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full s2p2 : ei6k)/opv wfiyipeed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W isrlf .-dq507hrew3 x ua connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr.e37uahdw 0xq fr- r5lent?

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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-Vyzfnz+ad+ ho ziw.0 +v.,gvx g9-wr1 z power supply. The operating current is 1.0 A at full speed. w+vg yz +.xnr.ig1 -v9z 0,hf +wozdazWhat 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 sw:+dlw* twshh7voeh)f za).n d: f*y6upply. The operating current is 1.0 A at full lat:wohw y6nweh):s .vhd)*zdf +*7f 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 reduw1*n-xgvc;h(e ikww 2 ce a 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 causes 14 A to flow iysm5h0a 4+q yqn the secondary. How many turns are in the secondaryyasy0 hm4q5q +?

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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 necessary4qecko y5m46 e/vz (lz in a 110-V primary if the 24-V sec6/ z(44ye5mz evqlock ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondaby;2(wb3 7a ;crxiie lry coil. If the current in the rb7iw; 3 bxlyei;(2casecondary 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 transformer. f9m: jck*a2rihf0 to* Assuming 100% efficiency, how many amps at 24 V c2*orcfh j*af:90i mktan 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 75008on(7 ot/bd7 nx(v ugo V at 10.0 mA. The primary coil operate( u78 7/xbo(ovdntg ons on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns oq( zv/)t66ui2t rn j0dn ci3pdn its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondaryjq6tididrp /nt 6u2 v3n cz()0?

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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 t 3;w1 ga2gzbjo9 m:mfiurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A i;zmf j92m3b :goiag1ws 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 it8kv0s htups8i8 k2 2b xpv/ qojom9:i*s secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curres vi *q:2txh 8p8v8k2ijku9b0som/o pnt at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary p: /vw4ta)pmf has 200 turns. If the input voltage to the prim:tw)v/ 4ppfam ary 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 1zp9q;ne lkd:oi88 u esecondary has 200 turns. If the power i iz:d 8k1l puen9q;8eonput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator producesseqhthb ;h 9*b*s f(s8 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer as8q bh eh;t9fs*hb( *snd 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 nl8w5bam,;r,bx wr4pu4q 7qa A 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 in the transmissiob q5x qa;w4barm,up,ln7r48 w n 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 cuqfi ,oe1ef8 j(rrent 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 in the trfjeq i8, (f1oeansmission 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 r y g4racy,,8ftu7xzd 8esistance 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 o ,8yf gaz yurtc78,xd4f 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. r wptort9usk(. 07dh:A generator produces 100 V at 70 A. In order to reduwu:t .7sr9 tdp0ro(hk ce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when 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 atxm7w3 7wyk5ghuj(3dl+ehz2 k 1000 V. How much less power would be lost if the power were transmittezkjy73 h3dugm w(hwxl57 k2 e+d at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitt9 o 8b-jb68q.vikfrjp ed on a line with resistance of 0.60 W. To 9vb rpif.88jojb6- kq 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. How much ee, eu3y1z) y3ayn hy3 x0fu gpz7.7vdvnergy is stored in the coil's magnefz)g. y 7v3yn73 y0y3u,e dheu1 avpxztic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. W lme94+ i- 9rwlmrcwspj*-o(ahat is this circuit's tim-9powc*-mij+ (emswa 9rl 4rle 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; av:e8jz4jgp 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 peazk/)1ng 9)3uc is( mtk:o qvskk 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 rd/o,fadk4 ocvpgi 0 )lks5,m9 esistance of the lamp 54/dl fmiksg9kp ,0o o)c,dav?

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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 connen:ecoc: hjk9,p(kce+ cted to a 120-V ac power supply. What is the peak current e+ hcon:, :pkk(cc9ej through 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+wh)v 3lh0ll3o7ebv i supply. What is the power dissip03ivhll lwb h7)o+3 veated in 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 50-W r692s/w4a wzfp psrx e+esistor 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 vyfeyi.9d*yet 3(0qqw; i/6 z s1tfpn50-W 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 5:yb;il(.l2 2ms ipcwdoyp -q3 0-W resistor 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 10 ziw : )z3 kmx)nc-y1ucuafl,.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 coilw 2+5nrhfvkw jc *qxt3b-* uh2 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;nahf hl(5o g:j)6bps have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W ofict t,2o g 4bug3r-q9oik y*: vzvl4) un(my:j 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 at a frequjcq qe1h-4e35u2p b gyf6c6cl9zfuc 1b *bs1fency of 20 kHz is applqy 1hgec lsu - 41u 6965p2ecb c1*cfbqzfjb3fied 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 11*, ,+8pczmryv6wfvamkra/d j ,eu4 e,0-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 capacierr v)4ntz)cgs :uhxd3x: 0(btor 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 capacitivmlnve,ys 8y3fj:0.zch jn 4y3e 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 r hf9uc w2k34zeeactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor 6ym panmuk,y 4bkd5pkh)-dr 32j4xh5be 100 W4k3ry , upm hh)6mbx2ndkpk5yajd4-5 ?

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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 capacitky( kb vk /*pwt*j35 prwvxzv0g6s0;m or 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 7hv2 xy,t uyk5W resistance, 15.0 W inductive reactance, and 10.0 W x7yuvk2h,ty 5 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 impedancep9,rbpjzg no2 e a8nk,/adk2 1 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serierz,a,2p2n k/gjp a8b ko9 dn1es?

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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- +t1iqi o(auw 2wbji5.W resistor, 20-mH coil, and 1.0-mF capacitor are o ibq+(uj1tw. wii25a 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, wh dzr f;+ifl57 f3bs-mbat is the impedance at 3z + dfi;7 fr5mfsb-bl1000 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 i df6+w 5jfrmoy,,0woi n series with a 20-mH inductor, what is the phase anww+r ,jyoof,dfm5 i60gle 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 a7x,lubincem9:jo3euh5 , n lwi 3; q-w series circuit with a 20-mH coil and 1.0-mF capacitor fu-wcmie iq ,,:nonl 57;wux3j hble93or a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in sertc,(5 1bqnf4e9ahacwb7 q y-ries with a 100-W resistor and 15-mH coil to get a total impedance owh e57y9-abc f q4,1aq(tnrcbf 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 4/aoj3 f/rr wu q dn(fcsfp)/,650-mH inductor at 5000 Hz for a total impedance of 40000 qrnfp u/a /(,)wcrosj/fdf36 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 vu5pam;67j) d.ybprv at 1.0-MHz for a total impuv7a )5 .jpmvyb6; rdpedance 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 c3yto ic 8gx5oz 63ahak6t7 yw:onnected in series with a 20-mF capacitor. What is the impedance 7kiyz5:xt6a t38yh oaw63gcoat 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 needed in series with a 10-mF capaciknw.v,7 bjg(vtor at 1.0 kHz for a total (bnkv .vg,jw 7impedance 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 av *2g+nvme uq6/u6jxr 10-mF capacitor at 1.0 kHz for a phasenm 62 xg/u6qrjvvu+* e angle 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 nee -ajnpa xb7-1oded in series with a 30-W resistor at 1.0 kHz for a total impedance p ao1 jxa-n-b7of 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 witxxn p1ut7*hf /r3m1: c qwzze1h a 100-mF capacitor at 120 Hz. What is the phase a1/r*pnz xe f3u7hqx1 :1mt wczngle?

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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 resisto5os e+kf6vf 5d(6uneur, 20-mH coil, and 1.0-mF capacitor are connected in seri 6e(5os6kfndeuuf 5+v es?

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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 capadjm:nbp)mxe *mpz*1b d8) x; bcitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppln bp8 j;xez )*1) dmmpmd:xb*by. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a c*98 q (c s-npzj8hefjjapacitor of capacitive reactance 30 W, and an inductor of inductivs9epcf qhj(88*znj- j e reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing gw /ptt2:kp :ha 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whet/:hw:kg ptp2n 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 i 3za;czq kop)7n series with a 500-W resistor for a phase angle ofc o7a)3p z;kzq $40^{\circ}$ 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,a+vlzp5 / r ht/bdx/n = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sxt5/h /l,bn p+vzr/ adource?

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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 reu-cpi/l82u w*h zcfcrljc.* 3sistance, 15.0 W inductilccucju.8zf3/ 2- c*r* hiwlpve 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 an AC circutst q fwsrn9)hip ,;k;nsc55t *yt jh9l2i.u/it 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+ -3t8mvh :khysxf* it impedance of 60 W and a resistance of 30 W. What is the power factor?f -3xyt+ m tv8hkhs:*i

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resisto be,vm- xonp0-r, a 10-mF capacitor, and a 0.45-H inductovonp0m-b- , xer, 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 ckcdy6 r0;f9dd apacitor and a 15-mH coil in series?cdfdd kr9y 60;

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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 frwvix 6tb,p-s +equency of 10 vwsx-ti6pb+, 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 neqo3 ) srj(kqi0eded in series with a 3.7-mH inductor for a resonant frequencyi)0q3s (jkrq o 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-W resistor and a 40-ma6)uqiq hy ,co0n,s)jH coil if the resonant frequency of the,js o ,)qnc6u0q )yiha circuit is to be 1000 Hz?

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