Current Loop as a Magnetic Dipole question from MHT CET 2026 (16 Apr, Shift 1)

Answer: (b)

1. Torque on a coil is a vector product: $\vec\tau = \vec m \times \vec B = nI(\vec A \times \vec B)$.
2. With the coil plane parallel to B, $\vec A \perp \vec B$, so $\tau = nIAB$ (maximum).
3. So the answer is (b) $nI(\vec A \times \vec B)$.