The total charge on a uniformly charged spherical shell having radius $R$ is $Q$. Then electric potential at a distance $r = R/2$ from the centre of the shell is . . . . . . .
- A$Q / 4\pi\epsilon_0 R$
- B$Q / \pi\epsilon_0 R$
- C$Q / 2\pi\epsilon_0 R$
- D$Q / 8\pi\epsilon_0 R$
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