Answer:
4.73V
Explanation:
Parameters given:
Radius of sphere = 65.7 cm = 0.657 m
Electric field = 7.2 * 10^5 V/m
Electric potential, V, is given in terms of Electric field as:
V = E * r
Where r = distance between charge and point of consideration.
Since we are considering a point just outside the spherical conductor:
V = 7.2 * 10^5 * 0.657
V = 4.73V