NCERT 5.3 - Magnetism and Matter
Question: A closely wound solenoid of 800 turns and area of cross-section 2.5 × 10⁻⁴ m² carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?
Answer: m = 0.6 J/T (or A·m²) pointing along the axis of the solenoid by the right-hand rule
Full step-by-step NCERT solution with diagrams on Something by Zero.