A thin nonconducting ring of radius \( R \) has a linear charge density \( \lambda=\lambda_{0} \...

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A thin nonconducting ring of radius \( R \) has a linear charge density \( \lambda=\lambda_{0} \cos \phi \), where \( \lambda_{0} \) is a constant, \( \phi \) is the azimuthal angle. Find the magnitude of the electric field strength at the centre of the ring;
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