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Quiz8-5409 - Physies 54% W9 QEEZ 8 WW Name egg g t 5...

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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»wifl[email protected] 5% g farm? b) When the ’E—field of the incident wave points in the positive x-direction, 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 @=% [email protected] Q, 6/ a ‘7? m9 fafiigfaafifi 2/23 made; ...
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