Deriving the answer to this question can get involved. I am giving the formula only and am assuming you are looking for the magnetic field B at the center point of the sphere. If the sphere rotates with angular velocity along, say, z axis, then the formula for B is as follows:
Answer:I know the answer for B cus I’m doing the same problem. For B, you would only take the coefficient of friction given and then multiply it by the Normal Force, which in this case is the same as the Gravitational Force.
