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A conducting disc of mass 'm' and volume 'V' is suspended with
the help of a light spring of force constant 'k' from a fixed support.
Thickness of the disc is much smaller than its radius. A uniform
magnetic field of induction 'B' parallel to the plane of the disc is
established. The disc is slightly pulled down from equilibrium
position and then released. If the time period of small oscillations
of the disc is 2r,
Find the value of a. (Take ɛ, VB? = 2m)
k
B

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