Which expression gives the electric potential at a distance from an isolated point…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which expression gives the electric potential

V

at a distance

r

from an isolated point charge

q

in vacuum? (a)

V=\dfrac{1}{2}\,k_{e}\,\dfrac{q}{r}

(b)

V = 4\pi\,k_{e}\,\dfrac{q}{r}

(c)

V = k_{e}\,\dfrac{q}{r}

(d)

V = -\,k_{e}\,\dfrac{q}{r}