Physics - Elecrostatics Question with Solution | TestHub

The potential at a point $x$ (measured in $\mu \mathrm{m}$ ) due to some charges situated on the $\mathrm{x}$-axis is given by $\mathrm{V}(\mathrm{x})=20/\left({\mathrm{x}}^2-4\right)\mathrm{Volts}$. The electric field $\mathrm{E}$ at $\mathrm{x}=4\mu \mathrm{m}$ is given by