Question

A pivoted aluminium bar falls much more slowly through a small region containing a magnetic field than a similar bar of an insulating material. Explain.

Answer 1

Answer:

Non-metallic or insulating materials are free of the effects of induced eddy currents or induced emf. According to the Lenz's law, the direction of the induced current is such that it opposes the magnetic field that has induced it. Means the induced eddy current opposes its cause. That’s why an aluminium bar will falls slowly through a small region containing a magnetic field.