14. A flat dielectric disc of radius R carries an excess charge on its surface. Thesurface charge density is o. "The discrotates about an axis perpendicular toits plane passing through the centrewith angular velocity w. Find themagnitude of the torque on the disc ifit is placed in a uniform magnetic fieldwhose strength is B which is directedperpendicular to the axis of rotation1(a) ΞσωπBR4.(b) 50σωπBR(c) -O0ABR4.(a)? ownBR4

14. A flat dielectric disc of radius R carries an excess charge on i

1.	14. A flat dielectric disc of radius R carries an excess charge on its surface. Thesurface charge density is o. "The discrotates about an axis perpendicular toits plane passing through the centrewith angular velocity w. Find themagnitude of the torque on the disc ifit is placed in a uniform magnetic fieldwhose strength is B which is directedperpendicular to the axis of rotation1(a) ΞσωπBR4.(b) 50σωπBR(c) -O0ABR4.(a)? ownBR4
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