Time periods of vibation of two bar magnets in sum and difference p...

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Time periods of vibation of two bar magnets in sum and difference positions are \( 4 \mathrm{sec} \) and \( 6 \mathrm{sec} \) respectively. The ratio of their magnetic moments \( \mathrm{M}_{1} / \mathrm{M}_{2} \) is
(a) \( 6: 4 \)
(b) \( 30: 16 \)
(c) \( 2.6: 1 \)
(d) \( 1.5: 1 \)
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