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