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The force of a circular electric current...

The force of a circular electric current acting on a small magnet with the axis perpendicular to the plane of the circle and passing through its centre is expressed by the formula
` F = (C (x))/((a^(2)+x^(2))^(3//2))`
where a = radius of the circle
x = distance from the centre of the circle to the magnet ` ( 0 lt x lt oo)`
C = constant
At what x will the value of F be the greatest ?

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