Question

In an electric field an electron is kept freely. If the electron is replaced by a proton, what will be the relationship between the forces experienced by them?

Answer 1

The charges on the electron and the proton are same. The only difference is that the charge on an electron is negative and the charge on a proton is positive. Thus the magnitude of the forces acting on the electron and the proton will be equal but in the opposite direction. It can be written as,
$$\begin{gathered} \mathrm{Fp}=-\mathrm{Fe} \\ \mathrm{Where}\mathrm{Fp}\mathrm{is}\mathrm{the}\mathrm{force}\mathrm{on}\mathrm{the}\mathrm{proton}\mathrm{and}\mathrm{Fe}\mathrm{is}\mathrm{the}\mathrm{force}\mathrm{on}\mathrm{the}\mathrm{electron}. \end{gathered}$$