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JEE Main 2012 Physics question

PhysicsElectrostatic Potential and CapacitanceJEE Main 2012

A charge of total amount Q is distributed over two concentric hollow spheres of radii r and R(R > r ) such that the surface charge densities on the two spheres are equal. The electric potential at the common centre is

Answer: (3)

Solution

Equal σ: , , with . $V =

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Question ID VK-103549