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A ring of radius R, charge Q and mass M is spinning around its symmetry axis. The ring sits on a horizontal frictionless surface.

A ring of radius R, charge Q and mass M is spinning around
its symmetry axis. The ring sits on a horizontal frictionless surface. A
uniform external magnetic field of strength B is parallel to the plane of the
ring. Find the angular velocity  at which there is zero normal force between
one edge of the ring and the surface.

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