A ring of radius R has charge -Q distributed uniformly over it. Calculate the charge (q) that sho...

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A ring of radius R has charge -Q distributed uniformly over it. Calculate the charge (q) that should be placed at the center of the ring such that the electric field becomes zero at a point on the axis of the ring distant R from the center of the ring. The value of q is (Q / 4) √(N). Find the value of N ?

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