Two materials 1, 2 have a boundary surface at x = 0 plane. For x < 0, B = 4I LSp and for x > 0, B = 6p. In the first region B = (0a, Aa, 3a) / 20T. Find (a) the flux density Bz and the ratio |Bz/ B| (b) the angle between B and Bz (c) the energy densities in J/m^3 in each material [Bz = (10a, + 16a, - 12a) / 20T, 2/1 = 36.870, 5/(48/)]