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Two bar magnets of the same mass, same length and breadth but having magnetic moments \( \mathrm{M} \) and \( 2 \mathrm{M} \) are joined together pole for pole and suspended by a string. The time period of assembly in a magnetic field of strength \( \mathrm{H} \) is 3 seconds. If now the polarity of one of the magnets is reversed and combination is again made to oscillate in the same field, the time of oscillation is
(a) \( \sqrt{3} \mathrm{sec} \)
(b) \( 3 \sqrt{3} \mathrm{sec} \)
(c) \( 3 \mathrm{sec} \)
(d) \( 6 \mathrm{sec} \)
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