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Two bar magnets of the same mass, same length and breadth but having magnetic moments M and 2M are joined together pole to pole and suspended by a string. The time period of assembly in a magnetic field of strength H is 3 seconds. If now the polarity of one of the magnets is reversed and the combination is again made to oscillate in the same field, the time of oscillation is

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$6 s e c$

$\sqrt{3} s e c$

$3 \sqrt{3} s e c$

$3 s e c$

answer is B.

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Detailed Solution

first case effective moment is 3M. Second case it is M and time period T $\propto \frac{1}{\sqrt{M}}$

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