A bar magnet of magnetic moment `2.0 A m^2` is free to rotate about a vertical axis through its
Channel: Doubtnut
Date: 2020-07-05

A bar magnet of magnetic moment `2.0 A m^2` is free to rotate about a vertical axis through its centre. The magnet is released from rest from the east-west position. Find the kinetic energy of the magnet as it takes the north-south position. The horizontal component of the earth's magnetic field is `B = 25 muT`.