The magnetic field of a uniform plane wave propagating in a lossless dielectric medium is given by: Ĥ(z,t) = î 1 - COS 2π Ꮓ Z : (10³t + 1/2) + ŷ 1½-½ cos (10³t + 1/72) — 1 COS a) What is the direction of propagation of the wave? b) Determine the frequency f and the wavelength λ. c) Find the dielectric constant of the medium. m d) Obtain the phasor and the time domain expression for the Ễ field.