A) Is directly proportional to the square root of its mass
B) Is directly proportional to its pole strength
C) Is inversely proportional to its magnetic moment
D) Decreases if the length increases but pole strength remains same
Correct Answer: A
Solution :
\[T=2\pi \sqrt{\frac{I}{M{{B}_{H}}}}\,\text{and}\ I=\frac{\text{w}({{l}^{2}}+{{b}^{2}})}{12};\ \ \therefore T\propto \sqrt{\text{w}}\] (w = Mass of the magnet)
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