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Q. A metallic ring with a cut is held horizontally and a magnet is allowed to fall vertically through the ring, then the acceleration of this magnet is

Electromagnetic Induction

Solution:

Since the metallic ring is cut, although there is a change in flux through the ring but the circuit is not completed so there can't be any current in the ring to oppose the motion of the magnet.
Thus, the acceleration of the magnet is just equal to $g$.