In which orientation of the magnetic dipole with the external uniform magnetic field is the system most stable?
Answer & explanation
Correct answer: option 4
The system will be most stable when the potential energy is the least. The potential energy of a magnetic dipole in a uniform magnetic field be the minimum when θ = 0.
Um = -m.B = -mB Cos θ
Umin = -mB ⇒ Cos θ = 1 ⇒ θ = 0