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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux ua.s fl 1+-hs4tltq ;dexcept

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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 t et14x o:bjnf s67z,je ntc,o;he $emf$ 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 n n+t345xyfou- t /d mqbcdj69of wire in a coil produces what kind of change on the iq+ f9 -tub4o n5mdxnj d/yc3t6nduced $emf$, 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 pr8g n 9tdy/na6uoduces what kind of change on the induced u6gtadn/n 98 y$emf$, 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 kpk2mhhh-os t as;xu(7g;c; 4what kind of change on the induced ;hs2ghs4p (h;xokcm k- tua7;$emf$, 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 i5 p t2gtbc4kjqa.+,pd an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducea 2mcn8ceq0d 5d current in a conductor will be that which tends t28mqna 0ccd e5o 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 tablegh10 8ecof h3h. A bar magnet is held above its center with its noeco0gh3 h1f8hrth 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 +.ao/e mv3*g .l uz mzan1np9von a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it .uo+lm/v3eng *9.1 mzn vaza papproaches 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 region where the m3eq: dp0,l tav h68yc:w had5wagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced chwt5 hye8l: 0a:waqd6 ,pv 3dcurrent 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 h:7di a.gj9 xkin a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When view7x9dg a kh.:jied 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 h4mdrw6l8e8m jn dt, ;eorizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. Wher,l8mn;8j4 dm e6dtewn 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 on a horizontal table and carries an ever-increasio m:rsqro -f*ml/5y i,ng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced c/rmi -m*,:ys5lqfo or urrent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterins(t 7in1o+h9phe qai5g first. As the north pole nse1+p7qh tiah9oi (5 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 rotl+kn a9/seu rx:-ej,d. gz7reated at 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 orientation of the lo .asgeld:- 9,zre+ ujnr7/kexop'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 speed about 4 b/y;alvztg: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 induct /v zbg4;la:yed $emf$ 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.8owf81p 71qyqmb gad)
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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 t l eale8m:,zwk81.zrhhat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. :dwmjw gf8- d; 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 (orh ofc+.61*nx r*aewibiented in the east-west direction) is moved northward at consta co.*ba+exfr *n6i w1hnt velocity through a 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 at a constant an4/:0qmqx9ltb8/r )xdsgq d dagular 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 n.vzuxp2 gb 2gisjd)i7;0 an,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 rotr/q db0 m342shbyue+gb rd;d 3ates through 60 revolutions each second. The frequency of trr/u02 ;+qbdhdbbs3mg3y4 d ehe $emf$ 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 dee8ie x3i u/tu(vice used 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 mr+( p45 hikruz8sq r5that

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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 f2)p (mnr8w lzprimary coil then r(wf)2 zlnm8pit 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 p;r8tomblg hrmo0x 0q++h4 1hhrimary coil contains more loops than the secondary coil themho+ghbo84hrqh0xr0t m l 1 +;n 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, th.lu yfz6xcb,7w1cw ewh2yl:s9 y o(9 ue 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 circs/h jp))lm4 tsuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of constr4zffq y: ;*: eroafoaz41*c zant terminal voltage. At the moment contact is made with the battery, the voltage across the r ffq4faz: r:za1z croe 4o*;y*esistor 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 c)l -w/6n6:7zstxr8xh aw 5 rpm,ryftconnected in series to an ideal battery of constant terminal voltage. 7l x mrpzs6r nwr tf h-)c/8x6ytwa5,:At the 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 resistb 1 5r2nxyohy n,wa+er+*k4itance 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 inductanmbc8dm;mqo3 kbx)j*:ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bai2 4a2/sjiq o-;ju71kv t .1*xmb2juemtazqlttery. The time constant for the circuit represents t1-mlb2kj qxt 2 41iav/ tuo7m iuj jsa*eq.2;zhe 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 +ccth9y0 x ns bg6*ea2battery. The battery is suddenly removed from the yh9cg e2 +6 xbn*st0accircuit. 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 h34zx fw6(jxtzave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC k0ph k(scdt1:u,js0 w power supply. On this 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 power supply. In this circuit, th5 iprpk(/ aai5e curren/5aipra pi (k5t

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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 bygkai-32oyi5u what factor when the frequency is tri 2gu 3oyi-a5kipled?

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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 inde -nlcg;k7k2cbi5b 5zmv +4zfuctor is doubled, the inductive reactance of c+bbncz-5l5fk24 g7 e i mzkv;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 volo8er u v5ctyrxn5r,;* 3wd;vdtage across an inductor approaches zero, the inductive reactance of that ; r r3 5w,rdt* ;y5ndeoxuvc8vcoil

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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 t2,wm-r- sa gechis circuit, the curren e-,rmws g-c2at

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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 b.tfzd 3*m bsn/y what factor when the frequency is t m fbdsn*3t/.zripled?

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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 zcxnj8pr, kb4 6ero, the capacitive reactance oc6x p8 ,4knjbrf 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 induct7hu tqmxnuiw21i4t /7 f x3slurr ;+v1or and capacitor in a RLC ser qt7mx72 v1ruhnst wif1 3il4 ruu/+x;ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as +hohld0:l whea:)7v.epd gh/ $\cos M = R/Z$, 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 en t9;fhxaa3s2m z etyp-,:n) increases if R increases. When ista2s9,3nz x :-pten; heyam f) 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 impeu5dgac c7: oq.dance 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 m (p7b l:t7.4 2ipkxxymcvi9wi,sw8l 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 doubs o(k ze1j8 hkks ff v93c,u.y, 65jy1e,asdygle in an LRC series circuit, the resonan kvo6ks8ysye, u fy(kzaejj.,csd 35fh119,gt frequency 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 resonancvz )dll9xmj3t6y bc h72z39x ie,

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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 ciznbjyl9 fah ;z0/npz-d(v8/ s2p: wubrcuit 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 radius 0.10 m is rotating inl- l q vcxc/0/jlfs6q+ a uniform magnetic field of 0.20 T. Find the magnetic flux throughsqjc l+/0 c/6vxllf q- the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 muh/ a. sdk1z*g17nmzq 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 fie.dg* 17qmh /1sazkznuld 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 rof7v r; y -ve+jm-rik*jtating in a uniform magnetic field of 0.20 T. Find the mrre vjym-+vik*j-7 f ;agnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustab32omz1 n6e1bbjyq)rcr ,w7j fle single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes d om0hi* cker9s.s 7v r;7p ooes80+vqfrom $4.0 \times 10^{-5} \; Wb$ 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 wc4j0btn-tk *c: zcm6)sh 2 ojof 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 uniformly from 0.50 T to 0 in 8.0 s, find the average value of 6k cb*hwct 02 jon):c-sjm4z tthe 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 wi tosn(h*;yh sznq t6*.fx )gk2th 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 a 4.rba6eyzf :drea $0.20 \; m^{2}$ 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 3n x(fjxnd(v7 flies horizontally at a location where the downwxf7vjx( dnn(3ard 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 constant2q0bf8 hxt(os nliq3 l3 pal0q45(g m1tkug +g angular velocity of 2.0 rad/s about a vertical axiag3os+ gup3n8b iq tgkf1(5(2lq0lm 4 h0ltqxs 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 y nm;98cv-7d6 cgho rfarea 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 turnsfnf.oy9*,d ; uzqji( ,r*diiz 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 rectangul27otj *qvx; spt d(9v,eg7pht ar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axisgh,otdpx tj7s2t ;eq*v( p7v9 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 1)5k-9yw y dnzf7x wcqvr3f5,b00 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 ,9aqz:uz-t fc1 7 vsdsan output of 12 V maximum when rotated at 60 Hz. A masza 7s,ut-q91 f z:dcvgnetic 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 generator with a maxia*lj ,:) 9potb.gk) h kk dzb:lpj,8bimum $emf$ 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 c1t0+7k*6k4 rl s,mrhiaugugmotor have a resistance 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 motor have a resistance of 6o6 03vfqoewdw8ibw w/t56 j c2.00 W. The motor operates on 120 V AC, a e0o2 bvdw5iwq6o w6w8jcft/3nd 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 interno.z3v;sid:q 1u2abk nal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What bv;dzso 3uik.1a qn:2 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 Wh ud.y7sbi 5jk6t0+ec is connected to a 24-V power supply. The operating current is 1.0 A at f 6 y7bi ut5.hsdc0ekj+ull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectedhb4vcy3m;h q j m4(*ck to a 24-V power supply. The operating current is 1.0 j (hc4km3v4bh*mq;cy 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 tg* x 8gs7audtuaj -w*-o reduce 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-turnoq+ .pmapyr4/o e )/fouq. 4hk primary of a transformer causes 14 A to flow in the secondary. How many tur/ yuq4 eao)f. oh.+qrpm4/pok ns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V pwx -er4p 1vwl:rimary if the 24-V seco -4plrx1w:wvendary 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 cfc0m6p zpqqi *oxf166vcl :s 1oil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is t 1*0mqf :siqcv x1po6 6fclz6phe 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 p 0mqodv0;kk6wrimary of a transformer. Assuming 100% efficiency, how many amps at 24 V mo6 dqw0 vkk;0can 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 yn8si3jgh;i 0e/ru 8zprovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does tzhey8ng8 ;u ii03s rj/he 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 tur2anfo+jg;,) nxf. tzn7fkp r2krao :8ns on its secondary cp:r2jfo kgao,+7n zf xt)2nkfrn8 ;a. oil. 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 300 turns on ip9z yub (*)7ip f:z2dvlp.djfts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is jf( pyl.i279 zdzpv)dpf:bu* 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 turnsgp x4pnhz4ndmn/;j/pc.on/ 5. If the input current at the primary is 100 A, we can expect the output current at the se pxpo.;nng /4h/pm zd 4cn5jn/condary 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 20mims; 3o) -ac +rxh(jd0 turns. If the input voldm -+c(3hmor)i a xjs;tage 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 secondarylcn6pemm l f1+br27b+gm6.sc has 200 turns. If the power input to th+ 1ebp+nf ll6m 6s2r.cgb7 mcme 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 producesznntf(6u v:2iwtrq73 60 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. Fiiwurt zf:n(t72 63nv qnd 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 V. The voltag9))sfvsv lpb z* e(ov;e is usually stepped up to 4500 V by a transformer and tran9s) lvvbfsp ovze()*;smitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V.uw+l)+i ce4e w 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 transmission line if the voltage ie w)ci+u4w+les 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 0.60 W. A genezr078r82snjk2,3p y9ve5dyu uyj jrqrator produces 100 V at 70 A. In order to reduce energy loss 2jrun jz eyv5u j8yr9 r0d3k8,yp2s7qdue 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 l+5b f hpv-805sbgwiq3kb pvl1ine 50 km long has a total resistance of 0.60 W. A generator produces 100 V atfb sqi8gv0kpvw5-53pb h+l b 1 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when 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 b/q/),c hxc0uq jgl xrw/)py6 less power would be lost if the power were transmitted at 3000 V insh)w0c lg ,r/c/xx )ypbjqu/q6tead 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 transi fvvi4y83p sb;q h08tmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped uv0iipy h;fq 4s8v3 8tbp 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 enbqm*iw 0 2kyab au3b/9ergy is stored in the coil's ma9wim* akbub qb0y2 /3agnetic 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.l0z1l 1tkf7j e0-W resistor and an 18-H inductor. What is this circu fl0zt7kj1 el1it's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC c/-s r6yg97m*mbkr +tfzx h.dcircuit 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 currentiog (e yqn0hd1 4im+)k?

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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 i wi .xd7.3 m9kv)xbu7jce au:knto a 120-V AC outlet. What is the resistance of the la3ide 77xbx v9kwaum.)u kc j:.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 1 x:mm5y6ip87f j*axap20-V ac power supply. What is the peak current through the res86i*fax pyap5 :m7 mjxistor?

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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 com8gcv (9qlgl+nnected to a 120-V ac power supply. What is the power dissipated in theql(8v+c g m9lg 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-W267i c+ls fp.yn k+g0h0wqe:9 pb q,hvu klge3 resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor v 6;gvybd06e q 6wm2dgis $I = 0.80 \sin (240 t)$. 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 resg9d1 l5g4y/1p rcqfmdistor 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 inductorj)it;wacc 2 0m 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 coil at 1000 Hz?e xoxsfs 6(5bxo3,b8 n

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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 cespj ;ih1q/m.l9 c:xwoil 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 necessq8*mxk u6wk:jjg4d ,z 8xtm.c+ *hqzuary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mHzc/)o qf 6ci-qgiaedfvc ;801 inductor when 120 V AC at a frequency of 20 kHz is ivd8qgf10 f ; c)qi-ez/cao6capplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcecwpeavum8 5.qj0 ):i v?

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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 ya:,b :zb7 q muen//);zha dnuknw)q )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 t7,upt7y cepi7 yy.3joo have 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-h); du ysqy*s3ao- hr+/u3dfemF capacitor have 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 capacitive reactance of a 0.010-mF capacitor be gvu)xlvsn( .q9b0 f)x100 W9vlxugn0 (s) bf) .vxq?

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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-mb 1r8 sqj;g)eso/w( 0 7xekx;m:ljxl mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistarr 0h 8uz-xtp;e5bnz4nce, 15.0 W inductive reactance, and 10.0 W capacitive re8-4;bxrr n 0hzp5 uetzactance?

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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 c71q-uaol pa j+xi8*r eoil, and 1.0-mF capa+au7j1ix-rpl*8 qoe a citor 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 if a 100-W resistor, 20-mH coil, and 1.0-tbg .- : (sy0iksma)bmw(kcg 6mF capacitor are co: .mb(6 gs(w)0 makci-kbtgysnnected 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 2bjb bc:b1oid838c aqwith a 20-mH inductor, what is the impedancea 1j:c2dqob8 bb38cib 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 connected in series with a 20-mH inductols d0uzzy0fr76q)f 8p r, what is the phase angle at 10u8s f0zp)ql7ryz6 0df00 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 1.0-5dh s61ote(ggf bl9l- mF capacitor for dggf s9b1 thl(-56 olea 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 capacitancexsw qg h :cya 66d 1m:rpio, q+dtger3v2e+8z7s is needed in series with a 100-W resistor and 15-mH coil to get a total impedance ofto+:g1m:s +yech qq7da xe 2rg63z w68ipd,rv 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH4skf1dfchidjj4j (;5tdx e/4 inductor at 5000 Hz for a tot(4te/f4fkx1s5hjd;d d j4cji al impedance 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 1.0yz(- swa cag/)-MHz for a total impedance of 150 kW?a zs-w cg/)ay(

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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-m (f 9p9lpql5nr:fh 1.l*w jddcF capacitor. What is the impedanclj.:*pl9ldcf nr1pf 9 d wh(5qe 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 nkes12szg /xr+eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of srz k1gx/se+ 245 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 at6j5e l e8gzw mpj att e:0vmll3k91j2* 1.0 kHz for a phase angjml e:ja8lj35tg*p2 e kvlmw 96 etz10le 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 30-W resistor atdy 9 99vmwciy r/zl9f6 1.0 kHz for a total imp9zryd6/w 9yv9 ci mfl9edance 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 wi,zj3,+/ skhskbfy m*d th a 100-mF capacitor at 120 Hz. What is the phase anjym3 ,*/kk s+sh,dfbzgle?

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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-Wml,f*b n ef4p7 resistor, 20-mH coil, and 1.0-mF capacitor are fnm4e l*p7b,f 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 r egu(qwh3e9,f-,x 92exeot ej4z lo-mesistor, a 10.0-mF capacitor, and a 0.350-H , e9m- eu(xweo je3fzgox,9- l24qhet inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W;0+nn(iwm pg b, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuimbgn+n0;ip w (t?

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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 containin+v pthzdb8 o,5g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectvbop+5 z,th8ded 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 5mkpst r;/r 4w-vu9x r000-W resistor for a phase angle or wptxsr4uk m/r90 -;vf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frv-:ry1fcn df3+aj.oqyu 1o ,pequency should the circuit be driven in order to have maximum power transferred from the dqja,.3ud: 1vfp conyy1+r-f o riving 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 resistance, 15.0 xp(na+ 28+7rabcwn drk(wt hp *p b88kW inductive reactance, and 10.(n ncaxkr + htd28p8w(ap7 +*prbwbk80 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 Ad,s w ewnv1r.,C 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 h ml x:n,j0pm-60 W and a resistance of 30 W. What is the power fact-xlpj:0, mn hmor?

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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 circosr 7w vouaccv q qh5t5.vt;5 jc14u.,uit containing a 50-W resistor, a 1u.55shq7,avco cq1r;jvt.o v tcwu45 0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH corb1s( gju5mtur6+ (eail in series?+(a(1e rrj uubmg5st6

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needpa.4 e63 sfhmwtfbssu+(9ah .gv )j*ded in series with a 4.7-mF capacitor for a resonant freque(p*fs6d 9s.gwa3 .fv4 hmj+b te shu)ancy 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- ji*modq5k a3 with a 3.7-mH inductor for a resonant frequency ofj5o3 ai*q-kdm 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 p(v5rrf t up:028wp ba4efy vg,laced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?a4 , (ebfwv:r vyuftr5p02pg 8

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