Q. The period of oscillations of a magnet is 2 s. When it is magnetized that the pole strength is 4 times, its period will be
A) 4 s
B) 1 s
C) 2 s
D) $\frac{1}{2}$ s
Explanation
(b) When pole strength becomes 4 times, magnetic moment $M$ becomes four times.
As $T \propto \frac{1}{\sqrt{M}}$
$\therefore T\ becomes\ \frac{1}{\sqrt{4}} = \frac{1}{2}$ times
$T = \frac{2}{2} =$1 s.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.