Charge ‘q’ is uniformly distributed over the surface of an annular-non-conducting disc of inner radius R1 and outer radius R2. The disc is made to rotate about an axis passing through its centre and perpendicular to its plane with a constant frequency v (rotations per second). Magnetic moment of the disc can be expressed as :

Charge ‘q’ is uniformly distributed over the surface of an annular

1.	Charge ‘q’ is uniformly distributed over the surface of an annular-non-conducting disc of inner radius R1 and outer radius R2. The disc is made to rotate about an axis passing through its centre and perpendicular to its plane with a constant frequency v (rotations per second). Magnetic moment of the disc can be expressed as :
Answer» Charge ‘q’ is uniformly distributed over the surface of an annular-non-conducting disc of inner radius $R_{1}$ and outer radius $R_{2}$ . The disc is made to rotate about an axis passing through its centre and perpendicular to its plane with a constant frequency v (rotations per second). Magnetic moment of the disc can be expressed as :

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