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.
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 again made to oscillate in the same field ?
A. `sqrt3s`
B. `3sqrt3s`
C. `3s`
D. 6s
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Correct Answer - B
`T=alpha(1)/(sqrtM)Rightarrow M_(1)=3M and M_(2)=M`
`therefore T_(2)=sqrt3T_(1)=3sqrt3s`
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