A closely wound solenoid of 800 turns and area of cross section

Number of turns in the solenoid, n = 800

Area of cross-section, A = 2.5 × 10−4 m2

Current in the solenoid, I = 3.0 A

A current-carrying solenoid behaves as a bar magnet because a magnetic field develops along its axis, i.e., along its length.

The magnetic moment associated with the given current-carrying solenoid is calculated as:

M = n I A

= 800 × 3 × 2.5 × 10−4

= 0.6 J T−1