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A line charge lambda per unit length is ...

A line charge `lambda` per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light nonconducting spokes and is free to rotate without friction about its axis as per figure. A uniform magnetic field extends over a circular region within the rim. It is given by,
`B=-B_0 k ( r le a , a lt R)`
=0 (otherwise)
What is the angular velocity of the wheel after the field is suddenly switched off ?

Text Solution

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`-(Bpi a^2 lambda)/(MR) hatk`
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