[gmx-users] Question about the electric field?

[Xianwei Wang]

Dear GMX users：     I am doing simulation for protein with external electric field in Gromacs 4.5.4, I am confused about how the external electric field interact with  atoms. Is it like this : F(field)=F+qEF(field)  is the force of an atom in protein when  electric field is applied; F is the force due to the potential; q is the charge of the atom and  E is external electric field.