Saved Bookmarks
| 1. |
The flat insulating disc of radius 'a' carries an excess charge on its surface with surface charge density sigmaC//m^2. Let the disc rotate around the axis passing through its centre and perpendicular to its plane with angular speed omega rad/s. If a magnetic field vec B is directed perpendicular to the rotation axis, then find the torque acting on the disc. |
| Answer» Solution :`pi SIGMA omega r^3 Bdr and tau= pi sigmaomegaB int_(0)^(a)r^3 DR = (pi sigmaomegaBa^4)/(4)` | |