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Electromagnetic Waves Maxwell`s Equations Lecture 23 Thursday: 8 April 2004

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ELECTROMAGNETIC WAVES E = E m sin(kx - t) B = B m sin(kx - t)

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POYNTING VECTOR This is a measure of power per area. Units are watts per meter 2. Direction is the direction in which the wave is moving.

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POYNTING VECTOR However, since E and B are perpendicular,

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INTENSITY

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RADIATION PRESSURE

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Comet: Picture taken WEDNESDAY 26 March 1997,at 2000 CST,at White Bear Lake,Minnesota.

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MAXWELL’S EQUATIONS

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AMPERE’S LAW

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Reasons for the Extra Term u SYMMETRY u CONTINUITY

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SYMMETRY u A time varying magnetic field produces an electric field. u A time varying electric field produces a magnetic field.

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SYMMETRY

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CONTINUITY

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AMPERE’S LAW

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ELECTROMAGNETIC WAVES

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MAXWELL’S EQUATIONS

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