Electricity challenging problem

Electricity and Magnetism Level 2

A system consists of a thin charged wire ring of radius $$r$$ and a very long uniformly charged wire oriented along the axis of the ring with one one of its end coinciding with the centre of ring.the total charge on the ring is $$q$$ and the linear charge density on the straight wire is $$\emptyset$$ .evaluate the intersection force between ring and the wire. let $$\mu$$ be the permeability

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