Here's why:
* Permeability is a measure of how easily a magnetic field can be established in a material. It essentially describes how much a material "wants" to be magnetized.
* Nonmagnetic materials have very low magnetic susceptibility. This means they don't get easily magnetized when exposed to an external magnetic field.
* Free space is a vacuum, which is inherently nonmagnetic.
* μ0 is a fundamental constant in electromagnetism and has a value of approximately 4π × 10-7 H/m (Henry per meter).
Therefore, for nonmagnetic materials, their permeability is essentially the same as the permeability of free space, μ0. This implies that the magnetic field behavior in these materials is very similar to that in a vacuum.
