Solve this:
Q3. Electric potential in a region is varying according to the relation V = $\frac{3{\mathrm{x}}^2}{2}-\frac{{\mathrm{y}}^2}{4}$, where x and y are in metre and V is in volt. Electric field intensity (in N/C) at a point (1 m, 2 m) is

           (1) 3$\hat{\mathrm{i}}$– $\hat{\mathrm{j}}$                                                     (2) –3$\hat{\mathrm{i}}$+ $\hat{\mathrm{j}}$

           (3) 6$\hat{\mathrm{i}}$– 2$\hat{\mathrm{j}}$                                                   (4) – 6​ $\hat{\mathrm{i}}$+ 2$\hat{\mathrm{j}}$