A magnet of magnetic moment M oscillates...

A magnet of magnetic moment M oscillates in magnetic field B with time period 2 sec. If now the magnet is cut into two half pieces parallel to the axis, then what is new time period is only one part oscillate in field?

2 s

`2 sqrt(2) s`

`(1)/(sqrt(2)) s`

`2.4 s`

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