Two bar magnets of the same mass, length and breadth but magnetic moments $M$ and $2\,M$ respectively, when placed in same position, time period is $3 \,sec$. What will be the time period when they are placed in different position

  • A

    $\sqrt 3 \,\sec $

  • B

    $3\sqrt 3\, \sec $

  • C

    $3\,\sec $

  • D

    $6\,\sec $

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