Question

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

• A. 3T₀
• B. T₀
• C. $T _ { 0 } / \sqrt { 3 }$
• D. T₀/3

Answer 1

Answer: (A)

3T₀

Answer 2

$T = 2 \pi \sqrt { \frac { I } { M B _ { H } } } ; I \rightarrow 3$ times and $M \rightarrow \frac { 1 } { 3 }$times

So $T \rightarrow 3$ times i.e. $T ^ { \prime } = 3 T _ { 0 }$