Gauss' law for electricity and magnetism, Ampere's law and Biot-Savart's law — all of these laws are crucial for understanding electromagnetism and Maxwell's equations.

But I want to know how each of them derived their laws. If anyone could give me a link to any article or suggest me any kind of books then that would be big help too. I want to learn their methods for deriving these laws in a rigorous way.

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    $\begingroup$ It's generally better to ask one question at a time given our format here, so I would recommend that you edit this question to remove your question about the permeability & permittivity constants and ask it in a separate post. $\endgroup$ Jun 2 '21 at 18:41
  • $\begingroup$ Coulomb’s constant doesn’t have to be written as $1/4\pi\epsilon_0$. In Gaussian units it’s just $1$. You don’t need any permittivity and permeability constants for vacuum. It’s just a convention that SI has them. $\endgroup$
    – G. Smith
    Jun 2 '21 at 18:49
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    $\begingroup$ As pointed out above, this question would get better responses in History of Science and Mathematics $\endgroup$
    – silverrahul
    Jun 3 '21 at 5:36
  • $\begingroup$ Have you done any of your own research? Tried looking up short bio's of gauss, ampere, and biot and savart? Where should we start? These men were researchers in active fields, they developed theories building on a lot of work, and the laws themselves as we know them have their own long histories. $\endgroup$ Jun 13 '21 at 18:16

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