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Unformatted text preview: R i to R o or visa versa? Show that the disk will slow down and ﬁnd an expression for ω ( t ). 2) Using only F μν , show E · B and B 2E 2 /c 2 are Lorentz invariants. 3) Show that the 4vector potential A μ is not unique, by showing the 4vector potential, A μ = A μ + ∂ Ψ ∂r μ , gives the same F μν . What equation does Ψ have to satisfy in order that you can work with an A μ that satisﬁes, ∇ · A = 0 or ∇ · A + 1 c 2 ∂ Φ ∂t = 0, even if A μ doesn’t have these properties. 4)JDJ 1115 1...
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This note was uploaded on 12/24/2011 for the course PHYS 5406 taught by Professor Blecher during the Spring '10 term at Virginia Tech.
 Spring '10
 Blecher
 Current, Magnetism, Friction, Inertia

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