A short magnet oscillates in an oscillat...

A short magnet oscillates in an oscillation magnetometer with a time period of 0.10s where the earth's horizontal magnetic field is `24 muT`. A downward current of `18A` is established in a vertical wire placed 20cm east of the magnet. Find the new time period.

0.076s

0.5s

0.1s

0.2s

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