102lect15_handout - Physics 102 Lecture 15 Electromagnetic...

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Physics 102: Lecture 15, Slide 1 Electromagnetic Waves and Polarization Physics 102: Lecture 15
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Physics 102: Lecture 15, Slide 2 Today: Electromagnetic Waves •Energy • Intensity • Polarization
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Physics 102: Lecture 15, Slide 3 x y E loop in xy plane loop in xz plane 123 Preflight 15.1, 15.2 “In order to find the loop that detects the electromagnetic wave, we should find the loop that has the greatest flux through the loop.”
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Physics 102: Lecture 15, Slide 4 Propagation of EM Waves • Changing B field creates E field • Changing E field creates B field E = c B x y If you decrease E, you also decrease B! This is important !
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Physics 102: Lecture 15, Slide 5 Preflight 15.4 Suppose that the electric field of an electromagnetic wave decreases in magnitude. The magnetic field: 1 increases 2 decreases 3 remains the same E=cB
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Physics 102: Lecture 15, Slide 6 Energy in E field Electric Fields Recall Capacitor Energy: U = ½ C V 2 Energy Density (U/Volume): u E = ½ ε 0 E 2 Ad E d E d A CV U 2 0 2 1 2 2 0 2 1 2 2 1 ε = = = d E d A C o = Ed V = A
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Physics 102: Lecture 15, Slide 7 Energy in B field Magnetic Fields Recall Inductor Energy: U = ½ L I 2 Energy Density (U/Volume): u B = ½ B 2 / μ 0 lA n L o 2 μ = () Al B n B lA n LI U 0 2 2 1 2 2 0 2 2 0 2 1 2 2 1 = = = nI B o = A l
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Physics 102: Lecture 15, Slide 8 Energy in EM wave Light waves carry energy but how?
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102lect15_handout - Physics 102 Lecture 15 Electromagnetic...

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