If the period of oscillation of freely suspended bar magnet in earth's – McqOptions

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1.	If the period of oscillation of freely suspended bar magnet in earth's horizontal field H is 4 sec. When another magnet is brought near it, the period of oscillation is reduced to 2s. The magnetic field of second bar magnet is
A.	4H
B.	3H
C.	2H
D.	\[\sqrt{3}H\]
Answer» B. 3H

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