A ring of radius R is charged uniformly with a charge +Q. The electric field at any point on it axis at a distance from the circumference of the ring will be:
KQr
KQr2
KQr3(r2−R2)1/2
KQrR3
A
KQr
B
KQr2
C
KQr3(r2−R2)1/2
D
KQrR3
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