A square coil has its plane initially perpendicular to a uniform magnetic field that…
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A square coil has its plane initially perpendicular to a uniform magnetic field that points out of the page. The coil is then rotated clockwise about a vertical axis so that the magnetic flux through the coil decreases. When viewed from the original position facing the coil, which statement best describes the direction of the induced current during this rotation?
(a) It is clockwise, the same direction as the rotation.
(b) No current is induced because the coil’s area does not change.
(c) It is counter-clockwise, opposing the decrease in flux.
(d) It alternates between clockwise and counter-clockwise each quarter-turn.