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If ?⃗⃗ = 5 cos (?? + ??)?̂ V/m is given in free space and the...

If ?⃗⃗ = 5 cos (?? + ??)?̂ V/m is given in free space and the time period is 50 ns,

(a) show that this electric field can exit (find the condition),

(b) determine the magnetic field intensity, and

(c) the direction of power flow.

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