Question

A conducting rod of mass 30 g and length 48 cm has holes drilled near each end so that it is free to slide in a vertical direction along two conducting rails as shown in the figure below. A current of 240 A is made to flow through an identical rod at the bottom of the assembly and return through the sliding sliding rod. (Notice the placement of an insulator.) Determine the height of the sliding rod above the base rod when in equilibrium. Assume the horizontal rods are very long.
________cm?