Case : Read the passage and answer the question(s).

The magnetic susceptibility of a substance is defined as the measure of how readily it responds to an external magnetic field. It gives the measure of a substance's aptness to acquire magnetism. It has no units. Mathematically, it is defined as the ratio of the intensity of magnetization to the magnetic intensity. The susceptibility of a substance is given as (2.7 x 10^-5). 

What is the magnetic permeability of the substance?

13 x 10^-7

μ = μ_o μ_r = μ_o (1 + X)

X = 2.7 x 10^-5

μ_ο = 4π x 10^-7

μ = 12.5 x 10^-7