A closely wound solenoid of 2000 turns and the area of cross-section 1.5 × 10 –4 m 2 carries a current of 2.0 A. It is s
Magnetic moment M=NIA=2000*1.5e-4*2=0.6 Am^2, torque τ=MB sinθ.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
