NEET-XII-Physics
05: Magnetism And Matter
- #3A short bar magnet placed with its axis at 30° with a uniform external magnetic field of 0.25 T experiences a torque of magnitude equal to 4.5 × 10-2 J. What is the magnitude of magnetic moment of the magnet?
Ans : Magnetic field strength, B = 0.25 T
Torque on the bar magnet, T = 4.5 × 10-2 J
Angle between the bar magnet and the external magnetic field,θ = 30°
Torque is related to magnetic moment (M) as:
T = MB sin θ
Hence, the magnetic moment of the magnet is 0.36 J T-1.