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Unformatted text preview: Physies 54%» W9 QEEZ 8 WW Name egg? g t 5 ﬁre”? @eg gectinn: .1le
Q n e
P C ircle the best answer: 1) A capacitor is charging with a current I, causing the charge Q to increase with
time. At the point P near the edge of the plates, 1 ﬁnd a) a nonzero electric ﬁeld and no magnetic ﬁeld. & at g p Q nonzero electric ﬁeld and a nonzero magnetic ﬁeld. } ﬁg; ﬁg é {3 @MW%& e as ewe ﬂfmﬁ g c) a nonzero magnetic ﬁeld and no electric ﬁeld. d) that the electric and magnetic ﬁelds cancel. 2) Two laser beams (Bl, BZ) have identical powers, but are of different intensities. I
want the electricﬁeld of B1 to be 5 times smaller than that of B2. I should adjust the area of El to be 25 times smaller than that of B2. 1 g g: g E g the area of B1 to be 25 times larger than that of B2. f?’
the area of B1 to be 5 times smaller than that of B2. 9: J;
d) the area of B1 to be 5 times larger than that of B2. E5 ‘9 5 ga
ﬁt 7" .3. age: “‘5' s: f? i=
dp d2 5’ $2 3) A 20 W laser beam propagates in the z—direction with a X—polarized electric ﬁeld
and passes through two polarizers (The solid black line denotes the polarization
axis of the transmitted beam for each polarizer). The frequency is 5 X 10M Hz. Use c = 3 x 108 m/s. Use sine] = 0.6, cos91 = 0.8. a) What is the wavelength? s 62%
dﬁgﬁ dgﬁgﬁi»wiﬂegtw@ 5%
g farm? b) When the ’E—ﬁeld of the incident wave points in the positive xdirection, which way does the B—ﬁeld of the incident wave point? Draw it on the
a» ﬁgure. '5 gaggﬁg @ﬂaaaj % @‘f gﬁfgﬁﬁ Ed 0) If 8} is oriented relative to the x—axis as shown, how much power hits the
second polarizer? ﬂ 5: aeegr‘égy a? gagséeﬁf mtg W t d) If 92 = O 0 relative to the x—axis, how much power passes through the
second polarizer? ﬁg 2 rat, a read {maﬁa}: racemg‘gej ‘5 e) Suppose that the 20 W laser beam is replaced by 20 W of ungolarized
light from a bulb. What are the new the answers to parts (0) and (d)? g a,
9&3: QM
@=% 2@ Q, 6/ a ‘7? m9 faﬁigfaaﬁﬁ 2/23 made; ...
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This note was uploaded on 05/13/2010 for the course PHYSICS 54L taught by Professor Thomas during the Spring '09 term at Duke.
 Spring '09
 Thomas
 Physics

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