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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A coil of radius R carries current i1. Another concentric coil of radius r(r<<R) carries current i2. Planes of two coils are mutually perpendicular and both the coil are free to rotate about common diametre. Find maximum kinetic energy of smaller coil when both the coils are released, masses of coils are M and m, respectively.

A coil of radius R carries current i1. Another concentric coil of radius r(r<<R) carries current i2. Planes of two coils are mutually perpendicular and both the coil are free to rotate about common diametre. Find maximum kinetic energy of smaller coil when both the coils are released, masses of coils are M and m, respectively.

A spgherical shell of radius 'R' and uniformly charged with charge 'Q' is rotating about its axis with frequency 'f' . Find the magnetic moment of the sphere.