The electric potential V at any point $(\mathrm{x},\mathrm{y},\mathrm{z})$ in space is given by equation $\mathrm{V}=4{\mathrm{x}}^2$ volt where x, y and z are all in metre. The electric field at the point $(1\mathrm{m},0,2\mathrm{m})$ in V/m is: