Dear users LAMMPS
I have a plane electromagnetic filed so I can define the magnetic field according to the electric field by Maxwell’s equations but I need to know the Permittivity of free space and the Permeability of free space in the real unit of lammps.
How can I find them in the real unit?
I searched in the manual and Mailing list but I did not find anything.
The value of the constant C for the difference choices of units in the expressions of the latter manpage can be found as “qqr2e” in the function Update::set_units().
Any custom code should use that constant (i.e. force->qqr2e when converting interactions between charges to energies (or for forces use force->qqrd2e which is force->qqr2e/force->dielectric)) as do all current styles in LAMMPS that compute energies or forces resulting from interactions between charges.