A bar magnet suspended in magnetic merid...

A bar magnet suspended in magnetic meridian executes oscillations with a time period of `2` sec in the earth's horizontal magnetic field of `24` microtesla. When a horizontal field of `18` microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be:

1 s

2 S

3 S

4 s

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