A 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 to4.5 × 10–2 J. What is the magnitude of magnetic moment of the magnet?
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Given: The angle between magnetic field and magnetic moment is 30°, magnitude of the external magnetic field B=0.25T , and the torque experienced by the magnet is 4.5×10−2J.
The torque is given as,
Where, M is the magnitude of the magnetic moment.
By substituting the given values in the above equation, we get.
Thus, magnitude of the magnetic moment is 0.36JT−1.