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The retarded potential is given as follows. (A₀, ϕ₀, k, and ω are constants)

(a) Find the electric field E (to be obtained from the given A and ϕ).
(b) Find the magnetic field B (to be obtained from the given A and ϕ).

A = Ao cos(kx – wt)ŷ, ¢= ¢o

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