Determine the self-inductance of a toroidal coil of N turns of wire wound on an air frame with mean radius r and a circular

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Avoltaic cell converts chemical energy to