Question

Given \( n \) turns, current \( I \), permeability, and diameter, find magnetisation.

Hint:

Magnetisation is calculated as the number of turns per unit length times the current in the coil.

Answer 1

Magnetisation is defined as the net magnetic moment developed per unit volume of a material. For a solenoid-type coil, wrapping \( n \) turns per unit length and driving current \( I \) through them produces a magnetisation of \( M = nI \) — simply the turn density multiplied by the current.