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
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
- A
$\frac{{KQ}}{{({r^2} - {R^2})}}$
- B
$\frac{{KQ}}{{{r^2}}}$
- C
$\frac{{KQ}}{{{r^3}}}{({r^2} - {R^2})^{1/2}}$
- D
$\frac{{KQr}}{{{R^3}}}$
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