Q. At a certain place, a magnet makes 30 oscillations per min. At another place where the magnetic field is double, its time period will be
A) 4 s
B) 2 s
C) $1/2$ s
D) $\sqrt{2}$ s
Explanation
(d) As $T = 2\pi\sqrt{\frac{I}{MB}\ }\therefore T \Rightarrow \frac{1}{\sqrt{2}}$ time.
Initial time period = 60/30 = 2 s
$\therefore\ $New $T = \frac{2}{\sqrt{2\ \ \ }} = \sqrt{2\ \ \ }$s
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.