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Two bar magnets of the same length and b...

Two bar magnets of the same length and breadth but having magnetic moments `M` and `2M` are joined with like poles together and suspended by a string. The time of oscillation of this assembly in a magnetic field of strength `B` is `3` sec. What will be the period of oscillation, if the polarity of one of the magnets is changed and the combination is agnain made to oscillate in the same field ?

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