Moving Charges And Magnetism

A metallic rod of mass per unit length \(0.5 \mathrm{~kg} \mathrm{~m}^{-1}\) is lying horizontally on a smooth inclined plane which makes an angle of \(30^{\circ}\) with the horizontal. A magnetic field of strength \(0.25 \mathrm{~T}\) is acting on it in the vertical direction. When a current \(I\) is flowing through it, the rod is not allowed to slide down. The quantity of current required to keep the rod stationary is