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MHT CET 2022 Physics question

PhysicsElectrostatic Potential and CapacitanceMHT CET 2022

Three isolated metal spheres A, B, C have radius R, 2R, 3R respectively, and same charge Q. , and be the energy density just outside the surface of the spheres. The relation between , and is

Answer: (A)

Solution

The electric field just outside a charged conducting sphere of radius is , and the energy density is . So for the same charge:

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Question ID VK-093785