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A point charge \( +Q \) is placed at point
\( B \) at a distance \( 2 R \) from the center
\( O \) of an uncharged thin conducting
shell of radius \( R \) as shown in the
figure. If \( V_{A} \) be the potential at point
\( A \), which is at a radial distance of \( R / 2 \)
from the center of the shell, then
\( \begin{array}{ll}\text { (1) } V_{A}\frac{Q}{8 \pi \varepsilon_{0} R} & \text { (2) } V_{A}\frac{Q}{8 \pi \varepsilon_{0} R} \\ \text { (3) } V_{A}=\frac{Q}{8 \pi \varepsilon_{0} R} & \text { (4) } V_{A}=0\end{array} \)
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