# 5.3. 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 to  . What is the magnitude of magnetic moment of the magnet?

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

m = 0.36

Hence, the magnitude of the moment of the Bar magnet is 0.36 .

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