A bar magnet of magnetic moment is free to rotate about a vertical axis through its centre
PHYSICS · Subjective · CBSE · Physics · Magnetism and Matter · Magnetism and Matter
Problem
A bar magnet of magnetic moment 2.0 A⋅m2 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 Earth's magnetic field is B=25μT, directed from south to north.