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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A wire having a uniform linear charge density λ 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 a1 and a2 subtend very small same angle at point A. they are at distances r1 and r2 from point A, respectively (r2>r1).

A wire having a uniform linear charge density λ 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 a1 and a2 subtend very small same angle at point A. they are at distances r1 and r2 from point A, respectively (r2>r1).

A point charge +Q is placed at point B at a distance 2R from the center O of an uncharged thin conducting shell of radius R as shown in figure. If VA be the potential at point A then which is at a radial distance of R/2 from the center of the shell