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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 arere,k -mg/i7 r:+ ,m*anq(akpqfvdo5 r units 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 stat)a 9 ctncm+qg3es that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind *pw4 ihu9gt83h mnhr7of change on the indn3 ru4w89hmhgtpi7 *huced $emf$, 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 throughz: py6se7)36nmd hjj bm z(,rk a loop of wire produces what kind of chan:(,d jzsp7j hemmnzk6)y3 rb6ge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire *co rf1n2cr ye4ex 5h-produces what kind of change on the inducerfrc5o4ec1n h*-2ye x d $emf$, 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 magk-j *d/cvma0d)jpr4ny/x h7 rnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducf- krosz952;3w d. rtvxm: cgued current in a conductor will be that wh s:mor dr5x9 fuwv-.3kzg ;c2tich tends 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 magnet is heb5 /jdt qw8rmr233u3khcet qqd9a83o ld above its center with its north pole pointing down. The stationary magnet induces (whe qq3 ctor893b 8qa33w h rj5t2eu/ddmkn 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 ta;/7dq y twl vr5ej*nu,ble. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, thy /v, 7*uejtrqwdl5;ne 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 ig5cu x 7 svh4nme)k 1xza-(ud7n a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of t )7uuh(5 a1xknmv7z4cdxgs- ehe 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 a5o92rwwng2 oeph6zm9 level table top in a region where the magnetic field vector points straight up. The magnetic field s9gw 2h 6opz9ow2en mr5uddenly 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 im/a7 rbitb)1*3h s6 5r.jhgislw xr8i n a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, iijgbt) r lsmxs 631b.hiar7 8/5hwr*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 e3qgw4zc1)6e+it rr x )d o4npon a horizontal table and carries an ever-increasing current noo 4g+3wcidnt4px6ezre) q r)1rthward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wirv5w6fuh pqe fst+v- ;z e,k0o +uqwc8*e with the north pole entering first. As the north pole enters the wire, t5 *u0 8vvfw +;,q6t k-qehuwzce+pfsohe induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh cy*oxf*1x(n,iu w6 qtose direction can be varied. In a region where a uniform magnetic field points straight down, what must be tnx o1c f,(tu*xiyq 6*whe orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an9x6 8)utzaudk axis whose direction can be varied. Inud xz6a)89 tuk a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. 2zcs0ryta7cez+je; /
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that 14 odzp7zkh47,i8 l wj-tobqp 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 f oyt4n: hik 58xw4;z4 5zmpfkoield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direct ,0hdni l 47xc 9n0q8gna iil7iz1s+ipion) is moved northward at constant velocity through a magnetic fielp0illxs1n,n0ni a 7h8c 4qi i d9giz7+d 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 c qik y5sj* +0nnkjbihk6ybj 7;pz3p4 8onstant 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 t1lc p.k,fl w.transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions *c xm.tw -sq7keach second. The frequency of thwqt7kx- .c*sme $emf$ 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 used sjfh+e(y)q owe.0y 5m 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 devi1:(,eq reb*o:hdfaccc ty -, ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil conufa dojg.,m 54tains more loops than the primary coi,o.jf gu4dam5l then 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 w1c:cuodumg +n+/ vdik;4*z u the secondary coil then it is au ;ud4wmg:k dvucz1 *oci+/+n

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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 powey7ai72 o /v u-sgqwef7r 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 resonawx5 t19v/ry-+ 5o r ue*oddhjk59 mjiwnt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series*w )/oj( 2nwo gh,epca to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the rp*2e)o/ ch( w wnao,gjesistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batte a *y)o-b+-7htc3 w pgvaa,kjnry of constant terminal voltage. At the moment contact is made with the battery, the voltage across thej*v7n-a-tc+hk)owap gy3 a ,b 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 in7y9/q z4t (nlz yw*p6 zz1rysxductance 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 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 in fbmvw .2vwg7(b5bdko o qeg)8 i:a2a.ductance 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 conn7tlsq 2rj nj+q))o 3igected in series to a battery. The time constant for the circuit represents the time required for the current to r)ni 2gj7o)3qqtjls +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--vo 0ex+xk g k 6j:kjyd9w oiw154egb. The battery is suddenly removed from the circuit. -6jkbogx-ywoki4 0 9 5w+ke gj:dxve1The 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 saml6+u5ycztpgdr8w9k f*i,hx7g61 yl be 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 connecte9k):ndqhl m, )3lrae x3rnuz4d to an AC 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.ijfa-d(go +j / In this circuit, the curren( -gj aio/fdj+t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes vwv*8xt lyx4:wj0o / icfqd((by what factor when the frequency is tripled?ifw8jvo/dw xtx (lq(*cy40: v

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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 anjp87yi fha)pbt(wh* 6 inductor is doubled, the inductive reactanb tp6f87wa)hp* h(ijy ce of 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 gic1,,w*lke /v,u tszmr44wu approaches zero, the inductive reactance of that coi,z l/gv1 cku*s4 ,mu,4ew tiwrl

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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 suppd3z*d:l sikr 6ly. In this circuit, the currenl6 did*k :r3zst

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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(q)0oagxz21my9. g 8cvw1wb bd5m*,km iu uqi when the frequenci*91 yu iq()0 b g1aum5z bx8wgkdcm2voq,w.my 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 ts ;7lzn6kg chm-v4po 5he AC voltage across a capacitor approaches zero, the capacitive reactance of thatcnmlp6- go5h 74 vzsk; 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 ghp2dcpd:9gzf,u q2ank + 9byi,;( sbof the inductor and capacitor in a RLC series circuidb9+pigg9 2b 2;dhfs:nc,ayqk, (zupt?

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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 definedr d 8yllhk2yv2y(0:wi 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 thyk(:nlnmld7/inf(p5r+54j gfyq(nbe circuit increases if R increases. When i5 :pj(gly4kryn (qn5nfl7+/ ifdb nm(s 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 c7:w7u1ay3q 8ta vyv+q 925fyi mnyyyrircuit 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,1c1evuvv0(zs x) gsr r/,aqs. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circqxtdnh9+v9s0 unk 75 -rtehy 9uit, the resonant frequency of that circuit x q99 +9heunydt0t 5-hrskv7n 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 appliexpi2u0 we.+ygd 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 oimog9 k b/cl6 4by:7gjccurs 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 fie)z 14ezaqi syy,w t:k1ld of 0.20 T. Find the magnetic flux through the loop when the e1)1k4wa,:i qytz ysz 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 is rotating in a unqu-6 ha6l kw:but92a wm2dw* ziform magnetic field of 0.20 T. Find the magnetic flux through t* kl tbm w6q2d 6hw:9-auwz2auhe 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 ae1) d qf/pc v/9der/5uik pj+e uniform magnetic field of 0.20 T. Find the magnetic flux1eq5c) u dek i9+ep fpjr//dv/ 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 adjustable single lo65 4( u vvroep-1u+psqvlxo4 lop 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 cecz up9y2*w7p,gjw 5suxf50jh u4sh) i s 2i)boil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of w +tge3e(o lc8y+ze j2gire on a square frame with sides 18 cm. A unifor+(2eoyzet 3+g8le gj cm 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 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 anokx9w)m72 yn-mkuy:jykg, 1ob( b4 it 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 vf*.gb kvf6 n*7b4ngyd, it:jand area $0.20 \; m^{2}$ 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 a*(oc omp.u om+t a location where the umo.(ompc+* odownward 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 constbwt1 v lcue7bkz*++w/ ant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whil7e bu1/ +z tw+wklb*cve 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 5b,xw0 tas9)- ds il;fwjtft 9;0 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu8935cskpn qcdnfk z 88rns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12od3; o(sjzv s1 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 axis of rotatiszjv (1s o;3odon, 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 o lgs-8vpcc5)(tqiu4 v f 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 ohs 7;cltra;vmldl 5x(;tx9 x- f 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I tc7xx;( -lx5hms al;t;ld9r vf 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 maximum01we: 2v2oh7xt o yeia $emf$ 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 operatesv/i.g e g6nl9o -4nuxa97qqub 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 melhxc.76k( px2j :ay ootor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speey (:.2l7ek6o hxjpxc ad 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 is con fr- :q4m8zxgnnected to a 24-V power supply. The operating current is 1.0 A. What is the stq:-8gf xrm4n zart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2wcr7,9vtx 89vw 8tow k4-V power supply. The operating current cr,8 w7vxwt998wvtk o is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistau 4unj(b p,kg48nh ny(nce 6.0 W is connected to a 24-V power supply. The operating current is 1 4(pnk y8h,(gunnub4j .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 km)byi. n*q *vw4w0tzs ,knk x:q b-7ia 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 flowt w*x.t7 jfqi) in the secondary. How many turns are in the seconj *tfi.xqw)7tdary?

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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 kso90a h4 miuokg2.* dprimary if the 24-V secondary hm20 hod.*s9akk uigo 4as 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;x phzrxm*0mbn- rm)o *r7(oc secondary coil. If the current in the secondary is 3.0 *;n c) r-box (0p hmxr7mo*zmrA, 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 primar.sb4b +uyoy(k y of a transformer. Assuming 100% efficiency, how many amps at 24 V can flysk4. +buo(ybow 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 7500 V ntyd/jr5 u79i,il nbmk22.oz at 10.0 mA. The primary coilz25 m .,jn9ylb/tido2ukrn i7 operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil anexpw).n; zfk;yr 5 +ap *kz3icd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seconda;.+i;nyfe5x w r a pz3czpkk*)ry?

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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 tt,l (ty.qo1rturns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wh 1ttrt,( yl.oqat 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 ht;:) a tzzo rdi0d+mw5as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary toi5tw dm0a +)od :z;trz 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 z4y,t3o u006ec d m f:6s(hfdk9n tnmgturns and its secondary has 200 turns. If the input voltage to the pri40 3nt,gtd(6ukye d6hncomf z09:sfm mary 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 secondary has 200 turns. Ifvp*nwu z0 3f 4sbh+co 607iuvq the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictii v0w*47 u0o6s3 hubcz+pvqn fonal 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 us3i gvbuih9ci084g0 q iually stepped up to 4500 V by a transformer and transmitted through a poweriq8 9 4bg30iiucg0hvi line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage i,nz v9zinoks q) xb(6c; o28mjs usually stepped up to 4500 V by a transformer and transmitted through a pownom2 vjnq 8bz(zi)ckx9; o6, ser 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 currov7a:3k; emr,hg2yzh psjg/ ,ent 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 transmismj;okv 7hy,2 :z3ah,g/s g eprsion 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 hddit2huwk)a/ 9d ykr 7kw38c; as a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to he8 du7d2ick/9t ;3rh)ywk wdka ating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resis bviqmaq-fa9gtl.m ol*/+1qq u4+- t0 bq na0ytance 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 1la.-*4bauq go0-/ t q9b0tv aq+ lnfiqq mym+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 1l 7xb3;c 8vcxr000 V. How much less power would be lost cxr l73;bcx8 vif the power were transmitted 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 transmitted on a li 7rlc w:cw4.5,vy4:onzlo o mine with resistance of 0.60 W. To what voltage must the generator output be stepped up with a translco mri:c57,vo.n4l wo4wz y:former 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 energy is stored ix0*xv ;wazd9qn the coil's magnetiq dw*;z x0x9vac 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. What vj0yvb*sme.m 3p37 pnis this circuit's timybm jp33vsmpv * .ne07e constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage ibfrydm1v4+an5cvdl s ,o9) r6s 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 cur-bw-g wr 0ag3h;:ekhr rent?

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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-e nq04se0h;vfV AC outlet. What is the resistance of the laevhs n4e;f0q 0mp?

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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 j:1u glm kh2cc449ovu ,-zroqac power supply. What is the peak curre jo l- vuqgozu4m:c924rch1,knt 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 )qyy0 n klpd;(a 120-V ac power supply. What is the power dissipated in the rq(ndy)0kp y l;esistor?

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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 resistor iskh1 usggnc u:pthd. -a-:gzc-6k,,wg $I = 0.80 \sin (240 t)$. 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 resisto+rqhcd tls;zh09j 8b1e*dejh6 4o3 shr 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 rejsgq4 yv441 kxky-:rl sistor 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 inductor at v : wkx/5( ak)cu tp6elo:4wdn60 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 .yjqkr9*v(cdg f1 w+zHz?

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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 coiatmzw4n/zoxbs6h32b sm8 y63 l 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 of ian oe-ufq *3hvjtk(: 8c0cf7qnductive 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*y ak8:xr7wjaym 8 q+s 60-mH inductor when 120 V AC at a frequency of 20 kHz is:*x+ 8amrywjkyas78 q applied 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 som( k5;jdsb*z lpo d repq:-1i,urce?

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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 capacitor at rtir2 r;3g d)y ugo9b1ky:y uh; y1c8g10 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 +vkwywlk j2 jw k9;+fg;v8,f*eke mxls1/m y9have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1-r9ilb .1 o4f g1bksyy200 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 w)o3 o,q3t ;0zl pxq8qcd6zj8ewhan* 100 W?x zj8;*d3eopq6,80c l nhwz tqaqo3)w

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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 /+ g -ej;of1nye ig)zycapacitor 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 a 5wo);,;bvpbf1tz heqa; fg2 cn ac series circuit with 12.0 W resistance, 15.0 W inductive reactao ;1cfpfaqz t2v)5 ,;bwg;bhence, 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 1fn7wh4w2 ly za1if72hmo 6e h+ru3y 8c500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec7h+8 c1nyha i6wy rzh2 4u32 lffowem7ted 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, 20pyy/qr92+xz e -mH coil, and 1.0-mF capacitor are cz/ y yx9e+2pqronnected 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 connected0xcb:, +mxuc a in series with a 20-mH inductor, what is the impedance at c+x:ba m0ux,c 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-yks1zwc1)0qm 5i,taomH inductor, what is the phase anglekyic,q1mz 1 0o5wats ) 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 w8 *cd x3lyn.rui rt-c:m-:qd1.0-mF capacitor xqlnt.im--rd* ycd wu r:8c3:for 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 ispivxpb ;ly z4z1yx/ja06 0:wl needed in series with a 100-W resistor and 15-mH coil to get a total impel v4bazlw0yy; x6zpip j /:x10dance 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 in series with a 450:*f;b qn/x p:3b okkfk-mH inductor at 5000 Hz for a total impedance pb:/qo kk;nf:3*xkf b 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 lvibw+. fmy0+put in series with a 100-kW resistor at 1.0-MHz for a total iy0.+ilfv mw+b mpedance 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 i8s)t .9jjk rsseries with a 20-mF capacitor. What is the impedance8 issjt).kr9j 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 needed in series withe2j6 m0 t5d4fi(zgtz n a 10-mF capacitor at 1.0 kHz for a total impedance ofnt j4dg 2 z(t0i6mzef5 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 dqdg(.ajhq)+y1. u y qot)t+va 10-mF capacitor at 1.0 kHz for a phase ang.odd yju agy) +.qq1(th +)tvqle 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 reslzknm ;j9ka8piiep2 vxy64c3t: nu966yha s2istor at 1.0 kHz for a total impedanccxy 2pazy9lm3k kt6s4hi9p i: 6unjev;n a628e of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phre 1 h 4w1+qgy;vqh)jpase angh)jgvr1y ew+ 4;qq p1hle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows aezxf79wrv:- st x:oxv3v v;w0mkr4. yt 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie037yt v:k ;r wmxrxxo e.vs4w:f z9vv-s?

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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-u 0vdid, zcbk5p k: af/-zrz./mF capacitor, and a 0.zp:f bvcrk-/d.5z/ akuz d0, i350-H 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 reactan mjzwdm u1x xn3-q4c*;ce 30 W, and an inductor of inductive reactance 30 W are connected in s jnq;cmx-z *3d1 4mxwueries 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 series5 11yol qq+3ox;tcsn k RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, 1 qo x5;oq1l3+ks ctynwhen 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 phase anl+ bg :4o)cc 0euv.elwgle of eeblcvc0uw4+.g)ol : $40^{\circ}$ 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:fk*a.)re eht-:metd has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order d:a t) .*:m-rtefehekto have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ace(4kemp rz1z4/xnu: d series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivene 4r1d(: 4ezmzx/kup 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 cin dfnxf8e2rt-x5s 6; trcuit 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 u wkvcjh/+ hh5d7z)jpo; 6lzt6;vxr3 an impedance of 60 W and a resistance of 30 W. What is th6+/j3 zw; voxhlvtu )z5 7dk;6jhrcphe 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 containing a 50-W resistor, o-lg mi6pci375 b-tl.n 2vkpnf x/z)n a 10-mF capacito im zpgn3nl2nv)c 5kpo/ .l6-ibt f-x7r, 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 capacit oboz0fnh*,i5 g 4x7 o;schm9wfr7 c:yor and a 15-mH coil in series?74rh0;fcsz :9igm7f5b*,ohowy x noc

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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 seriesu;) wxszgudaun *q(:+ with a 4.7-mF capacitor for a resonant frequency of 10n*(q;uagds zwux ): u+ 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 ikk,;/ fw iklm5zq*a8jn series with a 3.7-mH inductor for a resonant frequency of 1000 H 5fzw;l i*k,/ kjm8qkaz?

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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 an gyka0yxb(o;7 d a 40-mH coil (7xoykygb;a0 if the resonant frequency of the circuit is to be 1000 Hz?

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