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The electric field strength due to a ri...

The electric field strength due to a ring of radius `R` at a distance `x` from its centre on the axis of ring carrying charge `Q` is given by
`E = (1)/(4 pi epsilon_(0)) (Qx)/((R^(2) + x^(2))^(3//2))`
At what distance from the centre will the electric field be maximum ?

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