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A line charge lambda per unit length is ...

A line charge `lambda` per unit length is pasted uniformly on to the wire of a wheel of mass `m` and radius `R`. The wheel has light non-conducting spokes and is free to rotate about a vertical axis as shown in `Fig. 3.166`. A uniform magnetic field extends over a radial rigion of radius `r` given by `B = -B_(0)hat(k)(r le a, alt R) = 0` (otherwise). What is the angular velocity of the wheel this field is suddenly switched off?

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