電勢同電勢能~~

Potential V at X is given by,
V = kQ/R
where Q is the charge on the conducting sphere
R is the distance between the sphere and X (= 2 cm)
k is a constant

Electric field intensity E at X is given by,
E = kQ/R^2

Hence, E/V = [kQ/R^2]/[kQ/R] = R/R^2 = 1/R
hence, E = V/R = 1.6/(0.02) N/C = 80 N/C