MHT CET 2022 Physics question

They are two metallic spheres of same radii but one is solid and other is hollow then

(A)they can be charged equally (maximum)Correct
(B)solid sphere can be given more charge
(C)hollow sphere can be given more charge
(D)solid sphere can be charged double to hollow sphere

Answer: (A)

Solution

Charge given to a conductor (solid or hollow) resides only on its outer surface. The maximum charge a sphere can hold is fixed by the electric field at the surface just reaching the dielectric breakdown strength of air: , so

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Question ID VK-095706