alleryStart learning →What is the value of the permeability of free space?
A4 pi x 10^-9 T m/A
B4 pi x 10^-7 T m/A
C4 pi x 10^-7 T/A m
D8 pi x 10^-7 T m/A
Answer & Solution
Correct answer: B. 4 pi x 10^-7 T m/A
1. The constant mu0 appears in every expression for a field created by a current.
2. Its value is 4 pi x 10^-7 T m/A.
3. It is called the permeability of free space and is one of the basic constants in nature.
4. It is later shown to be related to the speed of light.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.9 Magnetic Fields Produced by Currents: Ampere's Law_
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