, , A ring of radius R is charged uniformly with a charge +Q. The electric field at a point on it...

, , A ring of radius R is charged uniformly with a charge
+Q. The electric field at a point on its axis at a distance r from any point on the ring will be :-
(1) KQ/(r^2-R^2)
(2) KQ/r^2
(3) KQ/r^3(r^2-R^2)^1 / 2
(4) KQr/R^3,

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