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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 non-conducting spokes and is free to rotate without friction about its axis (Fig.) . 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)"):}`

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