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# A short bar magnet placed with its axis at 30o 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?

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#### Given data angle between magnetic moment and magnetic field θ=300External magetic field B=0.25TTorque τ=4.5×10−2JThe torque experienced by a bar magnet placed at an angle θ with the external magnetic field B is given by τ=MBsinθ⟹4.5×10−2=M×0.25sin30∘⟹M=0.36JT−1

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