Q. A magnet is suspended lengthwise from a spring and while it oscillates, the magnet moves in and out of the coil C connected to a galvanometer G. Then as the magnet oscillates.
A) G shows no deflection
B) G shows deflection on one side
C) Deflection of G to the left and right has constant amplitude
D) Deflection of G to the left and right has decreasing amplitude
Explanation
(d) As a given pole $(N\ or\ S)$ of suspended magnet goes into the coil and comes out of its, current is induced in the coil in two opposite directions. Therefore, galvanometer deflection goes to left and right both. As amplitude of oscillation of magnet goes on decreasing, so does the amplitude of deflection.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.