A ring of mass 0.8 kg and radius 0.1 m makes `5//pi` rotations per second about an axis perpendicular to its plane through centre. Calculate angular momentum and kinetic energy of the ring

Two particles , each of mass m and charge q, are attached to the two ends of a light rigid rod of length 2 R . The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitudes of the magnetic moment of the system and its angular momentum about the centre of the rod

Find the moment of inertia of a thin circular ring about an axis passing through the centre and perpendicular to the plane of the ring

A conducting rod of 1 m length is rotated with a frequency of 50 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field of 1 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

Point masses m_1 and m_2 are placed at the opposite ends of a rigid rod of length L, and nelgligible mass. The rod is to be set rotating about an axis perpendicular to it. Find the position on this rod through which the axis should pass in order that the work required to set the rod rotating with angular velocity omega_0 should be minimum.

A 100 turn coil of area 0.1 m^(2) rotates at half a revolution per second. It is placed in a magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. Calculate the maximum voltage generated in the coil.

In a ceiling fan, each blade rotates in a circle of radius 0.5 m. If the fan makes 2 rotation per second and the vertical component of the earth's magnetic field is 8xx 10^-5 T , calculate the emf induced between the inner and outer ends, of each blade.

A gramophone disc rotates at 60 revolutions per minute. A coin of mass 13 g is placed at the disc at a distance of 8.0 cm from the centre. Calculate centrifugal force on the coin.