Answer to Question #184347 in Physics for yam

Question

an equipotential surface that surrounds a +3.0$uC$ point charge has a radius of 2.0cm. what is the potential of this surface?

Answer 1

$$V=k\frac{q}{ r}\\V=9\cdot10^9\frac{3\cdot10^{-6}}{ 0.02}=1.35\cdot10^6\ V$$