32 - Intensity and Polarization

32 - Intensity and Polarization - Physics 212 Intensity...

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Physics 212 Fall 2009 Intensity, Polarization 11/11/09
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Solution(s) E ( x , t ) = E m sin( kx ω t ) B ( x , t ) = B m sin( kx t ) E x = kE m cos( kx t ) B t = B m cos( kx t ) E x = B t E m B m = k = c Summary E d s = d Φ B dt ( E + dE ) h Eh = d ( Bhdx ) dt dE = dB dt dx E x = B t Faraday’s Law B d s = μ 0 ε 0 d Φ E dt ( B + dB ) h + Bh = 0 0 d ( Ehdx ) dt dB = 0 0 dE dt dx B x = 0 0 E t Ampere-Maxwell Law Wave Equation(s) (Equate mixed-partial derivitives) 2 E x 2 = 2 B x t 2 B t x = 0 0 2 E t 2 2 E x 2 = 0 0 2 E t 2 2 E x 2 1 c 2 2 E t 2 = 0 c = 1 0 0
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Antenna Shape Before the days of cable, televisions often had two antennae on them, one straight, and one circular. Which antenna picked up the magnetic oscillations? 1) the circular one 2) the straight one 3) both equally, they were straight and circular for different reasons.
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Intensity The amplitude of the magnetic Feld component of electromagnetic wave “one” is B. If the amplitude for wave “two” is 2B, how does the intensity of wave two compare to that of wave one?
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32 - Intensity and Polarization - Physics 212 Intensity...

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