A magnetic dipole experiences a torque of 80 3 N m when placed in uniform magnetic field in such a way that dipole moment makes angle of 6 0 ∘ with magnetic field. The potential energy of the dipole

Question

A magnetic dipole experiences a torque of 80 3 ​ N m when placed in uniform magnetic field in such a way that dipole moment makes angle of 6 0 ∘ with magnetic field. The potential energy of the dipole is :

TestHub · Accepted Answer

τ = M × B = MB sin 60 = 2 3 ​ ​ MB = 80 3 ​ ​ MB = 160 U = − M ⋅ B = − MB cos 60 U = − 160 × 1/2 = − 80 J ​

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