Two circular coils carrying currents are of nearly same radius have common centre and released from rest with their planes perpendicular . Assuming that they can freely rotate about their diameter, select the wrong alternative.

A circular ring and circular disc of same radius have equal moments of inertia about axes through their centres and perpendicular to their planes. The ratio of their masses is

Two identical coils carrying same current have common centre but have their planes at right angles to each other. If the field due to each is B, what is the resultant field?

A coil of radius R carries current i_1 . Another concentric coil of radius r(rlt ltR) carries current i_2 . 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 i_1 . Another concentric coil of radius r(rlt ltR) carries current i_2 . 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.

Two identical coils carry equal currents have a common centre and their planes are at right angles to each other. The ratio of the magnitude of the resulatant magnetic field at the centre and the field due to one coil is

Two identical coils carry equal currents have a common centre and their planes are at right angles to each other. The ratio of the magnitude of the resulatant magnetic field at the centre and the field due to one coil is

Two identical coils carry equal currents have a common centre and their planes are at right angles to each other. The ratio of the magnitude of the resulatant magnetic field at the centre and the field due to one coil is