The frequency of vibration in a vibration magnetometer of the combination of two bar magnets of magnetic moments ` M_(1) and M_(2)` is 6 Hz when like poles are tied and it is 2 Hz when the unlike poles are tied together, then the ratio `M_(1):M_(2)` is
A
`4:5`
B
`5:4`
C
`1:3`
D
`3:1`
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The correct Answer is:
B
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