Q11. Ques: $\sigma$ is the uniform surface charge density of a thin spherical shell of radius $R$. The electric field at any point on the surface of the spherical shell is :\\
(1) $\sigma / \epsilon _ { o } R$\\
(2) $\sigma / \epsilon _ { o }$\\
(3) $\sigma / 4 \epsilon _ { o }$\\
(4) $\sigma / 2 \epsilon _ { o }$