Two point charges lie on the x axis. A charge of $6\mathrm{.}1\backslash$mu C is at the origin, and a charge of $-9\mathrm{.}6\backslash$mu C is at x$=10\mathrm{.}0$cm$.$ What is the net electric field at x$=4\mathrm{.}0$cm$?$ What is the net electric field at x$=+4\mathrm{.}0$cm$?$