Practice question

Given: The magnetic potential energy of a dipole with m = 0.9 A m² in a field B = 0.2 T at 90° is: These values define the system as per NCERT data. Formula: U_m = -m B cosθ. This is standard NCERT relation. Substitution & Calculation: Given: m = 0.9 A m², B = 0.2 T, θ = 90°, cos 90° = 0 . Substitute: U_m = -0.9 × 0.2 × 0 = 0 J . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.