find the potential at point p.

(a) find the potential at point p. (q = 2.5 x 10-9c, a = 50 cm) (b) how much work by an external force is required to move a charge of – 3 µc to point p. (c) if the particle (mass = 5.0 µg) were released from rest at point p, what would be the value of its initial acceleration?