A 2 A current carrying straight metal wire of resistance $1\Omega$, resistivity $2 \times 10^{-6}\Omega\mathrm{m}$, area of cross-section $10\mathrm{~mm}^2$ and mass 500 g is suspended horizontally in mid air by applying a uniform magnetic field $\vec{B}$. The magnitude of $B$ is $\_\_\_\_$ $\times 10^{-1}\mathrm{~T}$ (given, $\mathrm{g} = 10\mathrm{~m/s}^2$).