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Practice Test Problem 1.9 [3 pt(s) Two infinite planes of charge are shown to the right. They have charge densities 30 and -o as shown. Calculate the electric field everywhere. II III +30 X Select One of the Following: (a) El = -20, En = 20 0, EIII = 20 (b) Er = - 5x, En = 201, Emi= (c) EI 20 1, EIII 260 2ED (d) Er 20 0 EN = =D, Em= 20 T ED