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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A line charge with linear charge density λ is wound around an insulating disc of mass M and radius R, which is then suspended horizontally as shown in Fig. 3.90, so that it is free to rotate. In the central region, of radius a, there is a uniform magnetic field B0, pointing up. Now the magnetic field is switched off, which causes the disc to rotate. Find the angular speed with which the disc starts rotating.

A line charge with linear charge density λ is wound around an insulating disc of mass M and radius R, which is then suspended horizontally as shown in Fig. 3.90, so that it is free to rotate. In the central region, of radius a, there is a uniform magnetic field B0, pointing up. Now the magnetic field is switched off, which causes the disc to rotate. Find the angular speed with which the disc starts rotating.

A line charge with linear charge density λ is wound around an insulating disc of mass M and radius R of radius a pointing up. Now the magnetic field is switched off so that it is free to rotate. In the central region there is a uniform magnetic field B0 which causes the disc to rotate. Find the angular speed with which the disc starts rotating. which is then suspended horizontally as shown in Fig. 3.90