At a point on the surface of earth, time period of oscillation of magnetic needle is T. Now a uniform magnetic field B, perpendicular to earth's horizontal component of magnetic field is produced in that region and time period of oscillation of the same needle at the same place is found to be . Then is equal to
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The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
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