An electric field has a constant value of 4.0 ×103 V/m and is directed downward. The field is the same everywhere. The potential at a point P within this region is 155 V. Find the potential at the following points:
(a) 6.0 × 10-3 m directly above P,
(b) 3.0 × 10-3 m directly below P,
(c) 8.0 × 10-3 m directly to the right of P.