In any region, if electric field is define as $\overrightarrow{E}=(\hat{i}+2\hat{j}+\hat{k})\mathrm{V}/\mathrm{m}$, then the potential difference between two points $A(0, 0, 0)$ and $B(2, 3, 4)$ in that region, is

From the following graph, find the value of $\left|\overrightarrow{E}\right|$ at $r=3.5 \mathrm{m}$

If the given figure shows equipotential surfaces, then the magnitude of electric field is

A uniform electric field of $200 {\mathrm{Vm}}^{-1}$ is directed at $45°$ with $x-$axis as shown in figure. The co-ordinates of point $P$and point $Q$ are $(1, 0)$ and $(0, 2).$ Find the potential difference, $V_P-V_Q$ (in volts).