Q. The period of oscillation of a bar magnet in a vibration magnetometer is 2 s. The period of oscillation of another bar magnet whose moment is 4 times that of 1st magnet is
A) 4 s
B) 1 s
C) 2 s
D) 0.5 s
Explanation
(b) As $T \propto \frac{1}{\sqrt{M}};and\ M$ becomes 4 times, therefore, $T$ becomes half. New $T = 1$ s
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.