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The magnetic constant, or permeability of vacuum [itex]\mu_0[/itex] is defined to be [itex]4\pi \times 10^{-7} N/A^2[/itex].
The first time this constant comes up is usually in the Biot-Savart law, however it is not an empirical constant. Why? In what quantity is it incorporated? Is it used to define the ampere (which defines the Coulomb)? Then, which came first? The Coulomb, [itex]\epsilon_0[/itex] or [itex]\mu_0[/itex]?
I couldn't find anything about this...
The first time this constant comes up is usually in the Biot-Savart law, however it is not an empirical constant. Why? In what quantity is it incorporated? Is it used to define the ampere (which defines the Coulomb)? Then, which came first? The Coulomb, [itex]\epsilon_0[/itex] or [itex]\mu_0[/itex]?
I couldn't find anything about this...