A current loop with magnetic dipole moment is placed in a uniform magnetic field B, with its

A current loop with magnetic dipole moment μ is placed in a uniform magnetic field B, with its moment making angle θ with the field. With the arbitrary choice of U = 0 for θ = 90°, prove that the potential energy of the dipole–field system is U = - μ∙B. You may imitate the discussion in Chapter 26 of the potential energy of an electric dipole in an electric field.