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A wire having a uniform linear charge de...

A wire having a uniform linear charge density `lambda` is bent in the form of a ring of radius `R`. Point `A` as shown in (Fig. 3.145) is in the plane of the ring but not at the center. Two elements of the ring of lengths `a_1` and `a_2` subtend very small same angle at point `A`. they are at distances `r_1` and `r_2` from point `A`, respectively `(r_2 gt r_1)`.
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