A conducting sphere of radius R carries a net positive charge Q, uniformly distributed over the surface of the sphere. Assuming that the electric potential is zero at an infinite distance, what is the electric potential at a distance r = R/4 from the center of the sphere?
Electric field inside a conducting sphere is always zero, and electric potential is constant inside the sphere.
and this electric pontial is given by:
(for distance less than equal to Radius)
where Q = charge on the surface of sphere
R = Radius of sphere
and so at distance R/4 from the center electric potential is same as above i.e
so first option is correct.
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