A short bar magnet having magnetic moment 4 Am2, placed in a vibrating magneto meter, vibrates with a time period of 8 seconds. Another short bar magnet having a magnetic moment 8 Am2 vibrates with a time period of 6 seconds. If the moment of inertia of the second magnet is 9 x10-2kg m2 the moment of inertia of the first magnet is (assume that both magnets are kept in the same uniform magnetic induction field )
OPTIONS
a. 9 x 10-2 kg m2 b. 8 x 10-2 kg m2 c. 5.33 x 10-2 kg m2 d. 12.2 x 10-2 kg m2
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newton 2 law of motion . when a object change its position with passage of time
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