Practice question

Given: A wire of length 0.6 m carrying 9 A is at 60° to a magnetic field of 0.4 T . What is the force on the wire? These values define the system as per NCERT data. Formula: F = I l B sin θ. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: F = 9 × 0.6 × 0.4 × sin 60° = 2.16 × 0.866 = 1.8706 approx 1.87 N . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.