A metallic rod of mass per unit length 0.5 kg is lying horizontally on a smooth inclined plane which makes an angle of with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is
Mass per unit length of a metallic rod
Let I be the current flowing.