Question

(a) Calculate the electric potential of Q= 25×10^-9 at 1m

(b) Calculate the electric potential of Q= 25×10^-9 at 2m

Answer 1

The electric potential of point charge is given by

$$V=k\frac{q}{R}$$

(a)

$$V=9*10^9*\frac{25*10^{-9}}{1}=225\:\rm V$$

(b)

$$V=9*10^9*\frac{25*10^{-9}}{2}=112.5\:\rm V$$