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A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 volts. The potential at the centre

A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 volts. The potential at the centre of the sphere is

(a) zero

(b) 10 volts

(d) same as at a point 25 cm away from the surface

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