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Unformatted text preview: Midterm #1 Review Not on the midterm: Sections 24.1 and 24.2 (Maxwells equations, displacement current), 24.4, 24.6, 24.8, 24.9 Chapter 24 EM waves have oscillating electric and magnetic fields that can be written as E = E max cos( kx t ) B = B max cos( kx t ) with k = 2 / , and = 2 f . Important Concepts and Equations 2 2 12 m N / 10 8542 . 8 C o m/A T 10 4 7 o Important Concepts and Equations Speed of EM waves is f c o o c 1 m/s. 10 3 8 c For EM waves, and Poynting vector is given by c B E max max / c B E / o B E S Important Concepts and Equations Direction of Poynting vector is direction of propagation of EM wave. Magnitude of Poynting vector Important Concepts and Equations o o o cB c E EB S 2 2 Intensity of EM wave is equal to average value of Poynting vector: o o o avg cB c E B E S I 2 2 2 2 max 2 max max max Important Concepts and Equations Important Concepts and Equations Intensity is equal to power per unit area: A P I avg Chapter 25 Not on the midterm: Section 25.6...
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 Winter '10
 Scheibell

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