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lecture24 - 26 Electromagnetic waves 1 Maxwells equations...

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26. Electromagnetic waves 1) Maxwell’s equations and electromagnetic waves 2) Properties of electromagnetic waves s m c / 10 3 1 8 0 0 = 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:
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Note: 1 nanometer = 10 -9 meter Classification of Electromagnetic Waves Wavelength decreases Frequency increases
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Gauss’s law for electric field Gauss’s law for magnetic field Magnetic charges do not exist: Amperes law 0 ε encl Q A d E = 0 = A d B Faraday’s law - = A d B dt d l d E 0 ε ρ = E 0 = 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) z k y j x i
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