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A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2s in earth's horizontal magnetic field of 24 $\mu$T. When a horizontal field is 18$\mu$T is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

(a) 1s          (b) 2s

(c) 3s          (d) 4s

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