A non-conducting ring carries linear charge density \\lambda. It is rotating with angular speed \\omega about its axis. The magnetic field at its centre is

{3 \\mu_{0} \\lambda\\omega}/{2 \\pi}

{\\mu_{0} \\lambda\\omega}/{\\pi}

UPSEE 2018 Solved Paper

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A non-conducting ring carries linear charge density λ. It is rotating with angular speed ω about its axis. The magnetic field at its centre is

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