Magnetics

A massless square loop, of wire of resistance \(10 \Omega\), supporting a mass of \(1 \mathrm{~g}\), hangs vertically with one of its sides in a uniform magnetic field of \(10^{3} \mathrm{G}\), directed outwards in the shaded region. A dc voltage \(\mathrm{V}\) is applied to the loop. For what value of \(\mathrm{V}\), the magnetic force will exactly balance the weight of the supporting mass of \(1 \mathrm{~g}\) ?

(If sides of the loop \(=10 \mathrm{~cm}, \mathrm{~g}=10 \mathrm{~ms}^{-2}\))