PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A horizontal conducting ring lies on a table. A bar magnet with its north pole pointing downward is released from rest on the ring’s axis, falls through the ring, and exits below it. Viewed from above, what is the direction of the induced current in the ring (i) while the magnet approaches the ring, (ii) when the magnet’s centre aligns with the plane of the ring, and (iii) while the magnet moves away below the ring?
(a) Clockwise, no current, anticlockwise
(b) Anticlockwise, clockwise, anticlockwise
(c) Anticlockwise, no current, clockwise
(d) Anticlockwise, anticlockwise, clockwise