Two bar magnets are placed in vibration ...

Two bar magnets are placed in vibration magnetometer and allowed to vibrate. They make `20` oscillations per minute when their similar pole are on the same side, while they make `15` oscillations per minute when their opposite poles lie on the same side. The ratio of their magnetic moments is

`4:3`

`25:7`

`7:5`

`25:16`

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