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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 evc0azkw1s )a8gc(idief - 93o xcept

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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 f h1j4fhwh 3j-yy- af/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 wirwxh; ct3 :li9tu(dz(ke in a coil produces what kind of change on the ind3i:wlk; (htzt9ud c( xuced $emf$, 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 prodee3nrd z5i g17uces what kindg 3dr7e5zine 1 of change 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 produces what k8h pdm(-u 1q1amup0 bvind of change on the induc b(uhd1map1m 0- q8vuped $emf$, 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 magnb,h9sb +1subg 1+frxt etic 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 induced current in a conductor wiyq8iz62zbk wo4os)1w ll be that bz)q1oo wy w4 is6k8z2which 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 862zdfgeff/apjf3 ) xc, g6eshorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducfepjz 2f ,c68ed f63/gfg s)xaes (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;8(n.mynl v*b wrqo +kat on a horizontal table. A bar magnet is held above its center with its north pole pointing downnqb v8(lorw.nyk +m;*, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vsx 2uwn7yw+ y2;onb*s ector points straight up. The magnetic +sy2n; snb*wux7 ow2yfield 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 top in a ren lk19y(b kfx.gion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, xf yk(.9kl1nbwhat 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 the magfhuqu0 z5zt+i3q: :oh netic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disapz fi:u 0uzh:3hqtoq5+pears?

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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 cxbt1.:zobf s +arries an ever-increasing current northward. Two coils of wire lie zo1f+x:tbb s. 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 wire with the north pole entering5 u bass:ctg ivn)+:e3 first. As the north pole enters the wire, the induced current will be (as viewed from above)v+b3 ine:s: )ca5u gst

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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 5sz3;b/xle s4xneu (bza :p rme(44br whose direction can be varied. In rzssxem;pn4a(b 5(4ube3zb/ xle r4: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 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 rotatedygin;- - 7o dk7tjz8nq 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 loop's axis of rotat87 tz inyoj7;-nqgdk-ion 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.f eq8i x8lq0q7
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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 an0i 8vvoy2 zfi- $emf$ 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 field8c u4d5qk*h zr. 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 direhddoh5( il0/ nction) is moved northward at constant velocity through a magnetic field that pinlh h5od(/d0 oints 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 a0y lqj mvx zdx+)rggk(xc 03n90vg55m constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator t/jbo;t-.ysua xtdk;n utz spc 1-g y:i/ b*14aransforms

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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 eac( 67j8fracx6yc(lw h hh second. The frequency of thj((l6haxwh fcrc68 y 7e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device us /y ax/rg 0l(z2yg,ziahuv z8;ed 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 devitg8ws(zxyhim(vgj s 64(8ky .ce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops t p+gj7)g.zhszp mv*p/han the primary coilpsg z)+/j.hgp 7vmz* p 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 the zy2mwpq932ofg f93 d esecondary coil3zgfo9yw qpdm e9 2f32 then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the +,ina 0b 3mqvmpower 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 cxk w8/g9qv:ff udd j./ mpgwx tg:20cl5l.aw 4ircuit,

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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 seriea;iveyp6*tlcwz4l t( 1r9s tr.cj2c6 s to an ideal battery of constantl6tpvs * i;j4( ewt1a9tlc.cr6cy 2z r terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of constasdp*-tjbp/ wz9 yp1.f nt terminal voltage. At the moment contact is made w1zfp/w tbpsyj.p9*-dith the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectnk4ddyx r.(xs raek5sco o3 0c,.q*v/(fs ru6ed 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 inductanc)p6 ahcd*yp*u/ l/ovt e 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 serieq n:k9n gmo5js,aak y; *8m+2f( a;m cv(vcsels to a battery. The time constant for*age;9(as 8a y jm;vcfk:kn+mvc 25qmns(,lo the circuit 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 batteru n zy6m+pfx746v. mtp wr32try is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrea4nufp7r+z rt3 .mv26w xtm6yp se to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same soj4zg8g0)c t 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 current z4c8hrmc l;r2il,8an

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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 c 7 k9:gql p(ucsuee/q0onnected to an AC power supply. In this circuit, the current ekp es0ql9u c(/7g:uq

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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 5,j8x2m: :u:zhvwjjs ocsx9 m3u8 f, w6b pprgac circuit changes by what factor when the frequency is triplewj2hf:u x6r:c 3s gv,pujopm,b58:9sxwz 8 mjd?

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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 thede muv(11,*wi rqp5j z AC voltage across an inductor is doubled, the inductive reactance of ,q 1wr5*1jp mve(dui zthat 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 the4k/(q8y, dv . qhbaypee48z fq AC voltage across an inductor approaches zero, the inductive reactance of8 f8kpz 44beq (a/ hyq,dvqey. 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 t9 b(/ign+ h*k2i/ zw jtb*etzthis circuit, the curreg *bntzb2e9i*jtwz( / /tik+hnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what * eb9o y4kzp9dg1m ,g tta:o,afactor when the frequency is t* bad o,1ggkpzmytt:9,e4 9aoripled?

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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 abtthd k kc9z.hzs3 nrw:.gm / 9,l.0ethe AC voltage across a capacitor approaches zero, the capacitive reactance w/9h:,nc.kb z3k9 ste tl.r.a mh0 gdzof 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 anglq3xn:h0l 4czue between the voltages of the inductor and capacitor in a RLC series cirnlc4z :xqhu0 3cuit?

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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 RL4t:vwy (byg2sjgi;h 9C 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 tjx2j 7d/jdqr/ gkgm:9he circuit increases if R increases. When is this statement tr7jqg/r 2g/kjddmjx9 :ue?

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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 impedancdeyqfe,,5)n kw 5 qmxw,r89zb e 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 impedanx0vf3nam 56wpe0 sf 8uce 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 seri6*v6zw ylflfaqg69lhhk*:87 y nob6 tes circuit, the resonant frequency of that ciyby6 klalwf:gno6fql8hv*6 z79th6 *rcuit 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 druq f0z q4)q jpapv8r8,iven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occw /m(41 1 pyk*-2zhthff azvuturs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.maguhe+8 1-h q5tmo;x: zwc5uil 1u:e 20 T. Find the magnetic flux through the loop when the plane of the loop am;luuq: ci+1 xe-1ewz855gmt oh:hu 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 mqg.r0nmxmji-d ,;if*0l et-m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic n il ,mqm x0.id*rmf0--;je gtflux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is3mq /mayn u3*2q +;zb c8d y.alocclk9 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 vec*l9oc8/qldm.3+ b n yzkacaqum;c32ytor are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop isf1 rz5-v xfm6;cf9d tn 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 from vdqk+3(5yg cv,t; gd a$4.0 \times 10^{-5} \; Wb$ 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 se/zt a4obt4b1m -yg0c 7lh2iwire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane o/-li s hm1 t0b74boa 2eytgzc4f 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 ls cwlz os3o4-))z3fd with 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 area ,no1gy ;vt)n;z lc o6r$0.20 \; m^{2}$ 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 ha*ae7t1 *hv yzorizontally at a location where the downward component of t**av1ehta7yz he 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 constanysgwtw 5n6 .347u1hehqdym:mt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while ineyuw4g7.m13h s5h nd:ywt6q m 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 harpia0x .f(8i/ n+wwaoc1dc r1 s 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wiyd 2:jw my5yb(ct(q* nre 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. Ek)dbfb- gj/ md5 xg)8sdec.h9ach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the lonc. xk- /9dhmdgfb)8seb5j dg)g side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistsb6*al 3h6 pkr4jrb.qix bj7p 9 of 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 of3r+d8cj x5gxb4tnt 8k 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the ark8jx+t cb5n4tgd3x 8rea 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 max:m 2aumleq1n0a9kkaa f7tb 0 9imum $emf$ 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 ztsw-30 *e 66kcogf dca 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 resi0-iz6 ycibc -zoyd7+ostance of 6.00 W. The motor operates on 120 V AC, and when running at full soz- -c +zoi7dycib6 y0peed 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 connected to a 24-V-iipxx23*xx24m: zatcn; w o k power supply. The operating current is 1.xa2o :4 2k;wxi 3m-zticxn*x p0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resixkc kt85;tttb/edqm2)th 3it1m 9+l xstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spe) bt8mq39e2+t/ ;tmkcxtt hxd51 klited. 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 m 1hqyl:a,+-kedcb7iW is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whycm7:dabq i l,k1+-ehat 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 ivy8)djw j7x 54rm7 svm gbz6j6s needed to 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-turn primary of a transformer causes 14 A to flow in the seckpy1/b )4aj ldzle,-aondary. How many turns areldzlaya )jeb,1- p/ 4k 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 primary if th5zvg 5. xi+qpj(/hjss e 24-V se(zvsxi.hps5j+q/ j 5gcondary 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 secondary co2 sdgy)qn* j: 6gotp:hz:xa*bil. If the current in the secondary is 3.0 A, whojggaxz 6:2h*n:s p)ty q *d:bat 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 theb5.pb2 n ipp7ikl:+u ehj,m r5dqsw.1 primary of a transformer. Assuming 100% efficiency, how many amps at 24 V cb7kp, i.s rpbi: e52p.jqdl u1 5wm+nhan 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 7500 V at 10.0 mA. T42i r,sm;r osnhe primary coil operates4o ;s,mri n2sr 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 itsv7vsb 0alz)e 9dlze.5;r o*fc6pcx(q/bzz5l primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presene(f)r 5dz.vzz0sqlcc5b6x lov *b/ze;79 aplt 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 nr2nmzwv1 (hw o y*u+8and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the suzyr2 nnhwmo8+*v(1wecondary?

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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 0 ns aa3q q0qg-(kn;hvturns and its secondary has 200 turns. If the input current at the primary is 100 A, we canqa hq03n gkv-(aqn s0; expect the output current 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 has 200 turw4rox: 9 u ls)r3p7yli+m blgmo :k+1rns. If the input voltage to the primary is 100 V, we can expec:1pwb4ok u:lilr+lr) 37o mrm9xsg +yt 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 transformerr, 9t4db/qkvp has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (net/v4rk p9qb ,dglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually26wy81xwm ymr stepped up to 4500 V by a transformer and transmitted 1yx268 y mwwrmthrough 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 A of current at 120 V. The vxfqgm l lz4 ;mk+ c0+:io*a2lxoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tolm2*4 li0 +lmf oakc;gxz+xq:tal resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagekwix ;jxth4/h-ibo:- j. wgv- is usually stepped up to 4500 V by a transformer and transmitted through a power line of tot; i-kjowg:/h.xi4hjb t-wv-x al resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.mh6ldu i52 ej1xi;-zsz:.cmi 60 W. A generator produces 100 V at 70 A. In order to reduce energy loss :-c5jile;z. hu6m x1isi z2dmdue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a* gka roa+;ofd;;b3 zz total resistance 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 of 100:1. What percentage of the d o bz*3fr a;g;;ok+azoriginal 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 1000l dp fp/nl3(y0e1x;bp V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10(pbxf3 1pl0/p;deynl00 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 generatp: ;uo p ig/ buo0rvfaex40d72or is 440 V at 20 A. It is to be transmitted on a line with resu7/ xr4 va0uodpfieo0 2;p:g bistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% 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 f8l-)r gsev81ha:;s ywfjn:fstored in the coil's magnetic f: wrv)8gse8jl-sf:y f ;hn a1field?

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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 vgti)l*wmg 4 06pg zcab)j*y8 contains a 6.0-W resistor and an 18-H inductor. What is this ci *g vi8)b*ltypa )06zg gwmjc4rcuit'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 circuit where the rms voltage is 120ehl l tf)13b,sx w/8ef 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 th.9ta b8qsr*w cg+h6fwe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thejm(1 *zonhs9 n a8z8rr resistance of the lamp* 89s znormh rznaj1(8?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wdohpu:x 5 -j nnkp -0:69 o0xaiscc7rxhat is the peak current through the resdnh5k0 cojcxp 9- xn -:axpr:u0s76 oiistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pow4ccr4pp 3mvbn:g) in .er dissipated in th4nb3p4gcnp )mr. :icv e 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 ag .jr 9ahv.je3 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a63 8nn5dfproq-xr;yws8 po j4 50-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 50-W resistor7x;veb oy6 yvtt/6 5tu 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-mHfet-zi.a: p6d .5m hqa+db .mb 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 coil at 1000 Hrpv76r kt )sl)yiuh902 b ; yjpkxn(b.z?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W ofeh*ftnxdx f 8bo6p 73+ 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 inductive reactac(gzb ib- k/1xnce 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 frequency of 20o-86i /edvahu (n3 rxu kHz is aviu(an-rd/e o6 3u8xhpplied 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 tzrf;jo l jvty0t91 pi jx*a0l54+ull4o a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitiv94o w eao+82ehblh2 s8lhbl1qe 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 isw* iwh +r7(cut2/0 fxv r,krnc needed to 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-mF f/oi0) n i*zxtcapacitor 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 capz,/ 2lbk anil00*q dabjp1 i8xacitor be 100 W?*10ladbn k0pialqz/,i2 bx 8j

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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 thn:zuh/a /*pdr rough a 0.0010-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 circuinl6nk(wvi c q25xy4hs2z *8bo t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive *xni c vkb8ln6 5s(o yhw2z4q2reactance?

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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 impe4b)+ywvw ep4 pdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serpe yb4wv)+ wp4ies?

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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 iffex+,oehzzfd( 6o o * b5u9;2zg.ouyb a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedf2;e5u z,od9b(6.u ofobxzo y * ezh+g 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 lupj t28u5u)ighj s55 a 20-mH inductor, what is the impedance at 1000u)ih uj58ug p52jsl5t 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 induc3yd ) q 5ctovy.1f bsf+h)1iwfgf 1:hwtor, what is the phase)1h qwf:v fgfy3 sbitwcd11h y5)f.+o angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1cyix wv(ne43jq0e b88 .0-mF capacitor for a total impedance of 100 W at 1500 Hz?yj we348v0 8 niq(xecb

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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 gz4 j )guf(r:.fb6p yvneeded in series with a 100-W resistor and 15-mH coil to get a total impedance of :fugp)fzgbv 6.(4yjr110 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 8 wnqhz2u3y 5pfru*( ca 450-mH inductor at 5000 Hz for a total impedance of 4qw8(23zunfu *yhcp 5r0000 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 s34 gxiegpc)6l+e*q f series with a 100-kW resistor at 1.0-MHz for a total i*3gei)l6 4qgcf+px esmpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF e5+4pt r41oaq g8vl(dz2laa o capacitor. What is the impedance al8v dtaar +geq2z4 pa lo451o(t 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 ih5)h02tjcs ; ) k3u. ad)enuvba/rr1.kd n kqcapacitor at 1.0 kHz for a total impedance of 45 5jak)adb3ces.1;)0n tu)r2k./und vr hihk q 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(ixwjeh,9p8mh8 /nqtrt6 : wo capacitor at 1.0 kHz for a phase angle o:i,wetnrh h ( q8 po6xt8w9mj/f $40^{\circ}$?

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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 a a(0nnk 4jagn0t,pu :mt 1.0 kHz for a total impedance of 45 W4ta:nn (puam k0n,gj0?

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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 9af/.wtq f3 nzphase aawtqn z.3 f/f9ngle?

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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 jx(2f vlqrka(a/,)xo Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar(,q/fxkrj xo)2ava (l e connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10cicds1 zui n2f 9b65*u.0-mF capacitor, and a 0.350-H induct2 5d 9*cuu1znsfi6bic or. 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, and an inductor*mmme4 x9/fvrj19 9- hqmjoyf of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in /fqr*99oe mj mx1m9jh4- ymfvthis 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 circu:+z2/ :6ysfx c/ipwr-lwbz vdp oum:.it containing a 50-W resistor, a 10-mF capaw zlp2.x-zmo vu6f rc:b iys:/:/+wpdcitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series wit-hs.87ww kljltzj h 65l ru37ih a 500-W resistor for a phase angle of kl58ww tlhjji 7s67rl. z-u h3$40^{\circ}$ 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 mFc h j-zk6 *w+c puyt98:m3xt;qq at,ni. At what frequency should the circui:9*t wax;ncqtyp3m68qj+c -hkt iu,z t be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac s u,x )n il,ywmz,;+msseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whens+;mlix sz) yu,,, wnm 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 circuit is h*og46lul2 gy0 ytucj;o c ;)p4 kwlr+$63^{\circ}$. 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 imp id ,pmf6ji kxft/x. / meu4496vlobt,edance of 60 W and a resistance of 30 W. What is the power,9 djf4tvm/m u/ ,b x46p6fieloikx .t 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 resis(;vclb 9npw 2u4vd9,8 dg3*imyhmrm wtor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supgncvh y4mv u( 3i9wmwrb; dl89 *mpd2,ply?

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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 capajpctmt05bpf2v -6c wj w sw01ic(e5 b(citor and a 15-mH coil in series?b05p cbccjv2f-1wj 6m(5es0 w pi(wtt

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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 4kl9++k iqs(ioe l5g j;.7-mF capacitor for a resonant frequency of i9 ;+k+se5lj( kgiloq 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for4; pd.zz9cn7 f0upcxfun); yy a resonant frequenc)9 ncucd fupn7; fyxz0 4;.zypy 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 resisy 4gk(brodum9 sr3 *cd;1 yg2ltor and a 40-mH coil if the resonant frequency of trg d y1c;2lg4yos(u d9 m*b3rkhe circuit is to be 1000 Hz?

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