Consider a thin cylinder's shell with radius r and mass m (inertia mr^2). Two sides of the surface have different characteristics. Outer surface of the shell is a conductor with resistivity ρ and thickness δ (δ<<r). And the inner surface is an insulator which is charged uniformly with surface charge density σ.
A torque τ works on the cylinder. Find the angular acceleration α of the cylinder when its angular velocity is ω!
Assume that magnetic field inside the cylinder is uniform and equals to magnetic field at the middle.

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