Two similar bar magnets are vibrating in the earth's magnetic field with their opposite poles on same side.Find the time period of oscillation.

Dear Pratik,

 The time period of vibrating T = where is the moment of inertia of the bar magnet about the axis of oscillation.
m = mass of the magnet
l = length of the magnet
b = breadth of the magnet
B_H= horizontal component of earth's magnetic field

  here,  M' = M - M = 0 as opposite poles on same side

as T is inversly proportional to M so,  T = ∞

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