A plane electromagnetic wave E = Em cos (ωt — kr), where Em = Emey, k = kex, ex, ey are the unit vectors of the x, y axes, propagates in vacuum. Find the vector H at the point with radius vector r = xex at the moment (a) t = 0, (b) t = t0. Consider the case when Em =1 60 V/m, k = 0.51 m-1, x = 7.7 m, and t0 = 33 ns.
