Consider a sphere of radius \( R \) having charge \( q \) uniformly distributed inside it. At wh...

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Consider a sphere of radius \( R \) having charge \( q \) uniformly distributed inside it. At what minimum distance from its surface the electric potential is half of the electric potential at its centre?
(1) \( R \)
(2) \( \frac{R}{2} \)
(3) \( \frac{4 R}{3} \)
(4) \( \frac{R}{3} \)
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