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Electromagnetic Waves Maxwell`s Equations

Electromagnetic Waves Maxwell`s Equations. Lecture 23 Thursday: 8 April 2004. ELECTROMAGNETIC WAVES. E = E m sin( kx - w t ) B = B m sin( kx - w t ). POYNTING VECTOR. This is a measure of power per area. Units are watts per meter 2 .

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Electromagnetic Waves Maxwell`s Equations

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  1. Electromagnetic WavesMaxwell`s Equations Lecture 23 Thursday: 8 April 2004

  2. ELECTROMAGNETIC WAVES • E = Emsin(kx - wt) • B = Bmsin(kx - w t)

  3. POYNTING VECTOR • This is a measure of power per area. Units are watts per meter2. • Direction is the direction in which the wave is moving.

  4. POYNTING VECTOR • However, since E and B are perpendicular,

  5. INTENSITY

  6. RADIATION PRESSURE

  7. RADIATION PRESSURE

  8. RADIATION PRESSURE

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

  10. MAXWELL’S EQUATIONS

  11. AMPERE’S LAW

  12. Reasons for the Extra Term • SYMMETRY • CONTINUITY

  13. SYMMETRY • A time varying magnetic field produces an electric field. • A time varying electric field produces a magnetic field.

  14. SYMMETRY

  15. CONTINUITY

  16. CONTINUITY

  17. CONTINUITY

  18. CONTINUITY

  19. AMPERE’S LAW

  20. AMPERE’S LAW

  21. ELECTROMAGNETIC WAVES

  22. ELECTROMAGNETIC WAVES

  23. MAXWELL’S EQUATIONS

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