A solid sphere of radius \( \mathrm{R} \) is charged uniformly. At ...

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A solid sphere of radius \( \mathrm{R} \) is charged uniformly. At what distance from its surface is the electrostatic potential half of the potential at the centre?
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(A) \( \mathrm{R} \)
(B) \( R / 2 \)
\( \left(C^{*}\right) \mathrm{R} / 3 \)
(D) \( 2 \mathrm{R} \)
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