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A line charge with linear charge density...

A line charge with linear charge density `lambda` is wound around an insulating disc of mass `M` and radius `R`, which is then suspended horizontally as shown in Fig. 3.90, so that it is free to rotate. In the central region, of radius `a`, there is a uniform magnetic field `B_(0)`, pointing up. Now the magnetic field is switched off, which causes the disc to rotate.
Find the angular speed with which the disc starts rotating.

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