An irregular conductor carries a surface charge density of -6.75 C/m2 at and in the vicinity of a point P on the surface. An electron is released just above P outside the conductor. What are the magnitude and direction of its acceleration the instant after it is released? (e = 1.60 × 10-19C, ?0 = 8.85 × 10-12 C2/N m2, mel = 9.11 × 10-31 kg)