Question

A magnet with its north pole pointing downwards along the axis of an open ring as illustrated. As the magnet reaches close to the centre of the ring

• A. its acceleration becomes greater than g
• B. its acceleration becomes less than g
• C. its acceleration remains equal to g
• D. none of these

Answer 1

Answer: (C)

its acceleration remains equal to g

As the ring is open, and not closed, induction of emf cannot take place.

And hence there is no opposing induced magnetic field.

Thus, the acceleration of the magnet remains same and equal to $g$.