8/5/08Lecture 2 Part 21 Maxwell’s Equations of the Electromagnetic Field Theory Gauss’s Law – charge makes an electric field The magnetic field is solenoidal.

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Two questions: (1) How to find the force, F on the electric charge, Q excreted by the field E and/or B? (2) How fields E and/or B can be created?
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Presentation transcript:

8/5/08Lecture 2 Part 21 Maxwell’s Equations of the Electromagnetic Field Theory Gauss’s Law – charge makes an electric field The magnetic field is solenoidal (no monopole sources). Faraday’s Law of electromagnetic induction -- E curls around a changing B. Ampère’s Law – current makes a magnetic field Maxwell’s “Displacement Current”

8/5/08Lecture 2 Part 22 Theory of Electromagnetic Waves

8/5/08Lecture 2 Part 23 Theory of Electromagnetic Waves

8/5/08Lecture 2 Part 24 Theory of Electromagnetic Waves

8/5/08Lecture 2 Part 25 Photon Energy Frequency Wavelength Applications Each part of the electromagnetic spectrum has important applications!

8/5/08Lecture 2 Part 26 With our modern technologies, we use all parts of the electromagnetic spectrum. But how do we create the different electromagnetic waves?

8/5/08Lecture 2 Part 27

8/5/08Lecture 2 Part 28

8/5/08Lecture 2 Part 29 Radiance = Power per unit area per unit wavelength Photosphere

8/5/08Lecture 2 Part 210 Blackbody Radiation Radiance = Power per unit area per unit wavelength

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