A wire, whose linear mass density is 150g/m, carries a current of 40A. The wire is suspended in the air by a flexible connection and lies above and parallel to another horizontal wire on a table 4.0cm below. A current is being passed through the bottom wire, thus creating a magnetic field and force on the top wire.
Determine the upward magnetic force on 1 metre length of top wire required to repel and support the top wire above the bottom wire?