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on July 1, 2020
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Intuitive Guide to Maxwell's Equations
They have to do with the behaviour of the electromagnetic field inside of different materials:
https://en.wikipedia.org/wiki/Electric_displacement_field
,
https://en.wikipedia.org/wiki/Magnetic_field#The_H-field
To get Maxwell's equations in a vacuum, just replace D with
ε
ₒE and replace H with B/
μ
ₒ.
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To get Maxwell's equations in a vacuum, just replace D with εₒE and replace H with B/μₒ.