Question: In a certain medium, E = 10 cos(10 8 t 3y)a x V/m. What type of medium is it? (a) Free space (b) Lossy

In a certain medium, E = 10 cos(10⁸t – 3y)a_xV/m. What type of medium is it?
(a) Free space
(b) Lossy dielectric
(c) Lossless dielectric
(d) Perfect conductor

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