A dipole is made up of 2 charges +q&-q separated by a distance 2a.Derive an expression for the electric field E due to this dipole at a point distant r from the centre of the dipole on the equatorial plane.Draw the shape of the graph,between |E| and r>>a.If this dipole were to be put in a uniform external electric field E,obtain an expression for the torque acting on the dipole.

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