A positive point charge is placed at $\mathrm{P}$ in front of an earthed metal sheet $\mathrm{S}$. $\mathrm{Q}$ and $\mathrm{R}$ are two points between $\mathrm{P}$ and $\mathrm{S}$ as shown in the figure. If the electric field strength at $\mathrm{Q}$ and $\mathrm{R}$ are respectively ${\text{E}}_{\text{Q}}$, ${\text{E}}_{\text{R}}$ and potential at $\mathrm{Q}$ and $\mathrm{R}$ are respectively ${\text{V}}_{\text{Q}}$, ${\text{V}}_{\text{R}}$. Then