" A line charge `lambda` per unit length is lodged uniformly onto the rim of a wheel of mass M and
Channel: Doubtnut
Date: 02/11/2021

" 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. 6.22). A uniform magnetic field extends over a circular region within the rim. It is given by,  `B=B_(0)k""     ""(ra le a,a lt R)`  =0 `""      ""` (otherwise)  What is the angular velocity of the wheel after the field is suddenly switched off?