A uniform plane electromagnetic wave propagates in the +z direction and impinges normally at z = 0 on an ocean surface. Let the magnetic field at z = 0 be H (0,t) = yH, cos 10t(A / m) (a) Determine the skin depth. (For the ocean: Conductivity = 0, permeability = o) (b) Find the expressions for H(z, t) and E(z, t) above the ocean surface. (c) Find the power loss per unit area (in terms of Ho) into the ocean.