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A vibration magnetometer placed in magne...

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earths horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earths field by placing a current carrying wire, the new time period of magnet will be

A

`1 s`

B

`2 s`

C

`3 s`

D

`4 s`

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