(i) At r = 0 (i.e. at centre of the ring) E = 0
(ii) At r >> a (i.e. at for off points on the axis) E = (1/4pÎ0)(q/r2)It shows that the ring behaves like a point charge for far off points.
The magnitude of E increases from zero as we move on the axis starting from centre of the ring. It attains
a maximum value at some point on the axis and thereafter again decreases. At the point, whose E is maximum , (dE / dr) = 0
Þ
Þ
Þ r = a/Ö2
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