- Q2: A plane wave traveling along the x-axis in a polystyrene-filled region with er = 2.54 has an electric field given by Ey = EO cos (wt - kx). The frequency is 2.4 GHz, and EO = 5.0 V/m. Find the following: (a) the amplitude and direction of the magnetic field, (b) the phase velocity, (c) the wavelength, and (d) the phase shift between the positions x1 = 0.1 m and x2 = 0.15 m. 50 points