RIEM News LogoRIEM News

What Is the Magnetic Constant and Why Does It Matter?

What Is the Magnetic Constant and Why Does It Matter?
Source: wired
Author: @wired
Published: 8/24/2025

To read the full content, please visit the original article.

Read original article
The article explains the concept of the magnetic constant (μ0), also known as the permeability of free space, and its fundamental role in electromagnetism. It highlights the interdependence of three key physical constants: the speed of light (c), the magnetic constant (μ0), and the electric constant (ε0). Since these constants are related, physicists define the speed of light exactly and then measure μ0 to calculate ε0, illustrating how measurement systems rely on defined units and relationships. The magnetic constant appears in equations like the Biot-Savart law, which describes how magnetic fields (B) are generated by moving electric charges or currents, with μ0 quantifying the strength of this relationship. The article further discusses practical implications of μ0, emphasizing that electric currents generate magnetic fields, which underpin technologies such as electromagnets, speakers, and electric motors. It also explains electromagnetic induction, where changing magnetic fields induce electric currents, a principle central to power generation. To measure μ

Tags

energyelectromagnetismmagnetic-constantelectric-currentmotorspower-generationelectromagnets