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A point charge Q is located on the axis ...

A point charge `Q` is located on the axis of disc of a radius `R` at a distance `a` from the plane of the disc . If one fourth `(1//4th)` of the flux from the charge passes through the disc, then find the relation between `a` & `R `.
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The correct Answer is:
[`a = (R)/(sqrt3)`]
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