Physics

Problem

Which of the following expressions gives the electric potential

V

at a point located at a distance

r

from an isolated point charge

q

in vacuum? a)

V=\dfrac{1}{2\pi\epsilon_{0}}\dfrac{q}{r}

V=\dfrac{1}{4\pi\epsilon_{0}}\dfrac{q}{r}

V=-\dfrac{1}{4\pi\epsilon_{0}}\dfrac{q}{r}

V=\dfrac{1}{4\pi\epsilon_{0}}\dfrac{q}{2r}