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The combination of two bar magnets makes...

The combination of two bar magnets makes 20 oscillations per minute in an oscillation magnetometer when like poles are tied together and 5 oscillations per minute when unlike poles are kept together. Then ratio of the magnetic moment of magnets is

A

`(1/4)`

B

`(17/15)`

C

`(2/3)`

D

`(3/5)`

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