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We are given that

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We know that the electric field at distance x from the center of ring of radius R is given by

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$E=\frac{KQa}{(a^2+a^2)^{\frac{3}{2}}}$

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Hence, the magnitude of the electric filed due to charged ring on the axis of ring at distance a from the ring's center= $\frac{KQ}{2\sqrt 2a^2}$

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