• # question_answer The time period of a vibration magnetometer is T0. Its magnet is replaced by another magnet whose moment of inertia is 3 times and magnetic moment is 1/3 of the initial magnet. The time period now will be              [MP PMT 2000] A)            3T0 B)            T0 C)            ${{T}_{0}}/\sqrt{3}$         D)            T0/3

$T=2\pi \sqrt{\frac{I}{M{{B}_{H}}}};\ I\to 3$ times and $M\to \frac{1}{3}$times So $T\to 3$times i.e. ${T}'=3{{T}_{0}}$