A plane wave traveling along the x-axis in a polystyrene-filled region with e, = 2.54 has an electric field given by E, = Ee cos(ot - 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 xi= 01 m and x2 = %3D0.15 m.