On a smooth horizontal table a disc is placed with non conducting ring with uniformly distributed
Channel: Doubtnut
Date: 2021-11-02

On a smooth horizontal table a disc is placed with non conducting ring with uniformly distributed charge q fixed on its circumference. Both disc and ring are of mass m and radius r. If a uniform magnetic field of induction B which is symmetric with centre of disc is switched on in vertically downward direction, find the angular speed attained by disc due to this.