Lect_26_note

Lect_26_note - Chapter 34 Electromagnetic Waves James Clerk...

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Chapter 34 Electromagnetic Waves
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James Clerk Maxwell 1831 – 1879 Scottish z Provided a mathematical theory that showed a close relationship between all electric and magnetic phenomena z His equations predict the existence of electromagnetic waves that propagate through space z Also developed and explained z Kinetic theory of gases z Nature of Saturn’s rings z Color vision
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Ampère’s Law s I o d μ ⋅= B ± B
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Imperfectness of Ampère’s Law
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Imperfectness of Ampère’s Law s I o d μ ⋅= B ± s I o B ± B Choose surface S 1 : Choose surface S 2 : 0
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Modifications to Ampère’s Law z Maxwell’s modification was to add a term z Animation + µ o Ι d s I o ⋅= B ± E do d I ε dt Φ = Φ E =E · A=(q/ ε 0 A) ·A=q/ ε 0 d = ε 0 d Φ E /dt=dq/dt=
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Ampère-Maxwell’s Law + µ o Ι d s I o ⋅= B ± s I o d μ B ± s I o B ± Choose surface S 1 : Choose surface S 2 : o d = o
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Ampère-Maxwell’s Law E do d I ε dt Φ = E oo o d I ε μ dt Φ ⋅= + Bs r r ± z The additional term Ι d is called the displacement current z Animation
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_26_note - Chapter 34 Electromagnetic Waves James Clerk...

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