lecture24 - 26 Electromagnetic waves 1 Maxwell’s...

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Unformatted text preview: 26. Electromagnetic waves 1) Maxwell’s equations and electromagnetic waves 2) Properties of electromagnetic waves s m c / 10 3 1 8 ⋅ ≈ = μ ε f c = λ Speed of light: Wave length: z direction of motion of wave E B x E v e.m. waves are transverse waves This wave is polarized in y direction Light is polarized when its electric fields oscillate in a single plane, rather than in any direction perpendicular to the direction of propagation. B Polarization of EM waves: Note: 1 nanometer = 10-9 meter Classification of Electromagnetic Waves Wavelength decreases ⇒ Frequency increases ⇒ Gauss’s law for electric field Gauss’s law for magnetic field Magnetic charges do not exist: Amperes law ε encl Q A d E = ∫ = ∫ A d B Faraday’s law ∫ ∫- = A d B dt d l d E ε ρ = ∇ E = ∇ B dt B d E - = × ∇ n dA di j dV dQ C C ˆ / ≡ ≡ ρ Charge density: Current density: Maxwell’s equations (review) (integral and in differential forms)...
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This note was uploaded on 12/10/2011 for the course PHYSICS 222 taught by Professor Frishman during the Spring '11 term at Iowa Central Community College.

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lecture24 - 26 Electromagnetic waves 1 Maxwell’s...

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