A metal ring is held horizontally and bar magnet

(i) A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. What will be the acceleration of a falling magnet?
(ii) Consider a metal ring kept on top of a fixed solenoid (say on a cardboard) (see figure).
The centre of the ring coincides with the axis of the solenoid. If the current is suddenly switched on, the metal ring jumps up. Explain.

(i) As the magnet falls, the magnetic flux linked with the ring increases. This induces emf in the ring which opposes the motion of the falling magnet, hence
a < g.
(ii) When current is suddenly switched ON, magnetic
flux linked with the solenoid and thus, with metal ring increases. Current is induced in the ring in anti-clockwise direction (as seen from top of the ring). Since, the direction of flow of current in the ring is opposite to the current in the solenoid, therefore they will repel each other and the ring jumps up.