In the figure, a very large plane sheet of positive charge is shown. ${\mathrm{P}}_{1 }\mathrm{and} {\mathrm{P}}_2$ are two points at distance l and 2l from the charge distribution. If $\mathrm{\sigma }$ is the surface charge density, then the magnitude of electric fields ${\mathrm{E}}_{1 }\mathrm{and} {\mathrm{E}}_2$ at ${\mathrm{P}}_{1 }\mathrm{and} {\mathrm{P}}_2$ respectively are :