$A$ thin spherical conducting shell of radius $R$ has charge $q$. Another charge $Q$ is placed at the centre of the shell. The electrostatic potential at a point $P$ at a distance $R/2$ from the centre of the shell is

  • A
    $\frac{2Q}{4\pi\varepsilon_0 R}$
  • B
    $\frac{(q+Q)^2}{4\pi\varepsilon_0 R}$
  • C
    $\frac{2Q}{4\pi\varepsilon_0 R} - \frac{2q}{4\pi\varepsilon_0 R}$
  • D
    $\frac{2Q}{4\pi\varepsilon_0 R} + \frac{q}{4\pi\varepsilon_0 R}$

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