A metallic rod of mass per unit length $0.5\,\,{\rm{kg}}\,{{\rm{m}}^{{\rm{ - 1}}}}$ is lying horizontally on a smooth inclined plane which makes an<br />angle of ${30^ \circ }$ with the horizontal. The rod is not allowed to slide down by flowing a current through it when a<br />magnetic field of induction ${\rm{0}}{\rm{.25}}\,\,{\rm{T}}$ is acting on it in the vertical direction. The current flowing in the rod to keep it<br />stationary is