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From Faraday's Law, there is no change in flux The magnetic field you propose violates Maxwell's equation $$ \nabla \cdot \mathbf B = 0 $$ on the line $(x=0,y=0)$, which means flux cannot be uniquely assigned to the ring, only to some specific choice of surface attached to the ring. If that surface is plane disk, then flux is zero, but if that surface is a ...


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