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Given,
The angle between axis of bar magnet and external magnetic field, θ = 30°
Magnetic field strength, B = 0.25 T
Torque on the bar magnet, Τ = 4.5 x
J
We know,
Torque experienced by a bar magnet placed in a uniform magnetic field is:
T = m x B = mBsin
Hence, the magnitude of the moment of the Bar magnet is 0.36
.