A non conducting hollow sphere of mass m and radius R having total charge q is rotating with constant angular velocity o about a

Question

A non conducting hollow sphere of mass m and radius R having total charge q is rotating with constant angular velocity o about a vertical axis as shown in the figure The sphere is then gently placed on the horizontal surface having a magnetic field applied in the horizontal direction as shown If there is sufficient friction to prevent any slipping then the friction force acting on the sphere at qoRB t 0 is Find the value of n m RI I 4 B

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