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A thin wire ring of radius R carries a...

A thin wire ring of radius `R` carries a charge `q`. The ring si oriented parallel to an infinite conducting plane and is spearated by a distance `l` from it. Find :
(a) the surface chagre density at that point fo the plane symmetrical with respect to the ring,
(b) the strength and the potential of the electric field at the centre of the ring.

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