Q. A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at $t = 0$ and completely emerges out at $t = Tsec.$ The current in the ring varies as
A) [image:6_image13.emf]
B) [image:6_image14.emf]
C) [image:6_image15.emf]
D) [image:6_image16.emf]
Explanation
(b) When ring enters and leaves the field polarity of induced emf is opposite. Also during the stay of ring completely in the field there is no induction
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.