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A ring of radius r has a uniformly sprea...

A ring of radius r has a uniformly spread charge + q on quarter of its circumference. The opposite quarter of the ring carries a charge – q uniformly spread over it. Find the electric potential at a point A shown in the figure. Point A is at a distance R(gtgt r) from the centre of the ring.

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The correct Answer is:
`V=(qr)/(pi^(2) in_(0)R^(2))`
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