A ring of radius \( R= \) has charge \( -\Omega \) distributed uniformly over it. A charge \( q ...
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0A ring of radius \( R= \) has charge \( -\Omega \) distributed uniformly over it. A charge \( q \) is placed at the centre of the ring such that the electric field becomes meru at a point on the axis of the ring distant \( R \) from the centre of the ring. The value of charge \( q \) is
(A) \( \frac{C}{2} \sqrt{3} \)
(B) \( \frac{Q}{4} \sqrt{2} \)
(C) \( \frac{9}{3} \sqrt{2} \)
(D) \( \frac{Q}{4} \sqrt{3} \)
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