A conduction rod of $1 \mathrm{m}$ length and $1 \mathrm{kg}$ mass is suspended by two vertical wires through its ends. An external magnetic field of $2 \mathrm{T}$ is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is  $\left[\mathrm{T}\mathrm{a}\mathrm{k}\mathrm{e}\mathrm{ }\mathrm{g}=10\mathrm{ }\mathrm{m }{\mathrm{s}}^{-2}\right]$