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A cone made of insulating material has a total charge Q spread uniformly over its sloping surface.Calculate the energy

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A cone made of insulating material has a total charge Q spread uniformly over its sloping surface.Calculate the energy required to take a test charge q from infinity to apex A of cone. The slant length is L.

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wext = ΔU = Uf - Ui 

Here VA = Electric potential at point A.

The electric charge on the considered ring

∴ Electric potential due to considered ring is

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