Pathfinder Magnetism BYU Q. 20

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India Santosh Sir IITK (Apex Physics)
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A rigid ring to roll along the ceiling of a room, where a horizontal uniform and static magnetic field of induction B exists perpendicular to the plane of the ring. Velocity of the centre of the ring is constant and its modulus is v. A charge particle P of mass m is fixed on the ring. What should the charge q on the particle and radius r of the ring be so that there is no force of interaction between the ring and the particle ?



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