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Question

The magnetic field at distance y from the centre on the axis of a disk of radius r and uniform surface charge density σ spinning with angular velocity ω is,
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A
μ0σω3(r22y2r2y2+2y)
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B
μ0σω2(r2y2r2+y2)
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C
μ0σω3(r22y2r2+y22y)
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D
μ0σω3(r2+2y2r2+y22y)
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