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# Chapter 32 - PowerPoint PPT Presentation

Chapter 32. Maxwell’s Equations Electromagnetic Waves. Maxwell’s Equations. Describe EVERYTHING in Electromagnetism. Gauss’ Law (Electric). Gauss’ Law (Magnetic). No magnetic monopole exists. Faraday’s Law. Ampere-Maxwell law. Rewriting the EQN. Another equation.

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Presentation Transcript

Maxwell’s Equations

Electromagnetic Waves

Describe EVERYTHING in Electromagnetism

No magnetic monopole exists

Maxwell’s equations(second version)

Maxwell’s Equation(Two Versions)

E

Light is represented by fluctuations in the magnetic and electric field called electromagnetic waves. EM wave is a consequence of the Maxwell’s Equation.

B

• Always travels at exactly the speed of light c.

• E and B are always perpendicular.

• E×B gives the direction of the wave.

• |E|=|cB|

• Two independent direction of polarization (later)

This is precisely the speed of light! Conclusive proof that light is a kind of EM wave.

And God said,

Let there be light,

and there was light.

- Genesis 1:3

The Dual Nature of Light(Quantum Mechanics)

Sometimes waves

Sometimes particles (photons)

• Acceleration of charges

• Electrons jumping in energy levels in atoms

• Changing energy levels in molecules

Poynting Vector