First slide
Magnetism
Question

A bar magnet has a magnetic moment of  200 Am2. The magnet is suspended in a magnetic field of 0.50 NA1m1 . The torque required to rotate the magnet from its equilibrium position through an angle of 300 will be

Moderate
Solution

Torque experienced by a magnet suspended in an uniform magnetic field is given by
 τ=MBsinθ
 Given  : M=200Am2;B=0.50NA1m1&θ=300
 τ=200×0.50×sin30
 τ=50Nm

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