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(6) A region of space in the form of a cube L/2 on a side contains an electric field at t = 0: E(r, t=0) = Eo z^ sin[(2π/L) x]. -L/4

E(r, t=0) = 0 for r outside this region at t=0 And B(r, t=0) = -(Eo/c) y^ sin[(2π/L) x]. L/4

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