KVPY SA Exam 2016 Question Paper

In an experiment , setup A consists of two parallel wires which carry currents in opposite directions as shown in the figure. A second setup B is identical to setup A, except that there is a metal plate between the wires Let ${\mathrm{F}}_{\mathrm{A}}$ and ${\mathrm{F}}_{\mathrm{B}}$ be the magnitude of the force between the two wires in setup A and setup B, respectively.