Practice question

Given: A wire of length 1.8 m carrying 2 A is at 30° to a magnetic field of 0.45 T . What is the force on the wire? These values define the system as per NCERT data. Formula: Force F = I l B sin θ. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: F = 2 × 1.8 × 0.45 × sin 30° = 3.6 × 0.45 × 0.5 = 0.81 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.