Physics

Problem

Three point charges are placed at the vertices of an equilateral triangle of side

0.20\,\text{m}

. Two of the charges are

+5\,\mu\text{C}

, and the third is

-5\,\mu\text{C}

. The space inside the triangle is filled with a uniform dielectric material of relative permittivity

\varepsilon_{r}=2

. What is the electric potential at the centroid of the triangle? (Use

k_{e}=8.99\times10^{9}\,\text{N}\,\text{m}^{2}\!/\text{C}^{2}

.) a)

+3.9\times10^{5}\,\text{V}

-1.9\times10^{5}\,\text{V}

+1.9\times10^{5}\,\text{V}

+1.1\times10^{5}\,\text{V}