A straight wire A B of mass 40 g and length 50 cm is suspended by a pair of flexible leads in uniform magnetic field of magnitude 0.40 T as shown in…

A straight wire $\displaystyle A B$ of mass $\displaystyle 40$ g and length $\displaystyle 50$ cm is suspended by a pair of flexible leads in uniform magnetic field of magnitude $\displaystyle 0.40$ T as shown in the figure. The magnitude of the current required in the wire to remove the tension in the supporting leads is $\displaystyle \_\_\_\_$ A. (Take $\displaystyle \mathrm{g}=10 \mathrm{~ms}^{-2}$ ).