Physics

Problem

Four equal point charges

+q

are placed at the four vertices of a regular tetrahedron of edge length

\ell

. Which one of the following gives the total electric potential energy of the configuration? a)

U=\dfrac{5kq^{2}}{\ell}

U=\dfrac{12kq^{2}}{\ell}

U=\dfrac{6kq^{2}}{\ell}

U=\dfrac{3kq^{2}}{\ell}