The magnetic field existing in a region is given by $\vec{B}=0.2(1+2 x) \hat{k} T$. A square loop of edge 50 cm carrying 0.5 A current is placed in $x-y$ plane with its edges parallel to the $\mathrm{x}-\mathrm{y}$ axes, as shown in figure. The magnitude of the net magnetic force experienced by the loop is mN .