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Problem
Problem
A solid sphere of radius
R
R
R
has charge '
q
q
q
' uniformly distributed over its volume. The distance from its surface at which the electrostatic potential is equal to half of the potential at the centre is (a)
R
R
R
(b)
2
R
2R
2
R
(c)
R
3
\frac{R}{3}
3
R
(d)
R
2
\frac{R}{2}
2
R
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