Q.
Two insulated rings, one of slightly smaller diameter than the other are suspended along the common diameter as shown. Initially the planes of the rings are mutually perpendicular. When a steady current is set up in each of them,
A) The two rings rotate into a common plane
B) The inner ring oscillates about its initial position
C) The inner rings stays stationary while the outer one moves into plane of the inner ring
D) The outer ring stays stationary while the inner one moves into plane of the outer ring
Explanation
(a) Both the rings rotate due to magnetic field induction of the other, till both come along the common plane.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.