Magnetism: Torque — Stable Equilibrium MCQ

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Torque — Stable EquilibriumMediumQuestion 20196

Question

A magnetic dipole aligned with the external field B is in:

A
Unstable equilibrium
B
Stable equilibrium
Correct
C
Neutral equilibrium
D
Non-equilibrium

Correct answer

Stable equilibrium

Explanation

At θ = 0° (dipole parallel to B), torque τ = mB sinθ = 0 and energy U = −mB cosθ = −mB (minimum). Any displacement restores the dipole → stable equilibrium.

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