B-H curve is use to find the mmf of iron Part of the Magnetic circuit. BH Curve is a Plot of the Magnetic flux Density (
→
B
) riversus the Magnetic field strength (
→
H
). This is an importent machine. The B-H curve is the curve characteristic of magnetic property of a material or element or alloy. It tells you how the Material Responds to an external magnetic field and is a critical piece of information when designing Magnetic circuit.