A square coil of side 0.1 m, with 50 turns, carries 1 A in a 0.2 T field. The maximum torque on the coil is

1. Magnetic moment m = NIA. 2. Area A = (0.1)² = 0.01 m²; m = 50 × 1 × 0.01 = 0.5 A·m². 3. Maximum torque τ_max = mB (when m is perpendicular to B). 4. τ_max = 0.5 × 0.2 = 0.1 N·m. _Source: NCERT Class 12 Physics Ch 4 "Moving Charges and Magnetism", §4.10.1_