# Magnetic permeability is maximum for (a) diamagnetic substances (b) paramagnetic substances (c) ferromagnetic substances (d) all of these

The more conductive a material is to magnetic fields, the higher its permeability. magnetic permeability is maximum for ferromagnetic substance. Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material.

Magnetic permeability μ (Greek mu) is thus defined as μ = B/H. The magnetic permeability in a vacuum is expressed as μ0.