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A thin nonconducting ring of radius r ha...

A thin nonconducting ring of radius r has a linear charge density `q=q_0costheta`, where `q_0` is a constant and `theta` is the angle at the centre from the diameter of maximum charge density in the anticlockwise direction. Find the electric field at the centre of the ring.

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The correct Answer is:
`(q_0)/(4epsi_0r)`
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