4 ms·
> A circular coil of wire with N turns and a diameter D will generate a magnetic field of B = u0.I/D (u0 is defined to be 4.π.10^-7); That u0 is meant to symbo
by _Microft 2y ago
> A circular coil of wire with N turns and a diameter D will generate a magnetic field of B = u0.I/D (u0 is defined to be 4.π.10^-7);
That u0 is meant to symbolize μ_0 (mu zero, with zero being subscript) the vacuum magnetic permeability [0], in case you were wondering where that magic constant came from.
[0] https://en.wikipedia.org/wiki/Vacuum_permeability https://en.wikipedia.org/wiki/Vacuum_permeability
- lapetitejort 2y agoSee also ε_0 [0]. 1/sqrt(ε_0*μ_0) = c, the speed of light [0]: https://en.wikipedia.org/wiki/Vacuum_permittivity https://en.wikipedia.org/wiki/Vacuum_permittivity