Question

An infinitely long straight wire carries a conventional current as shown in the figure The rectangular loop carries a conventional current in the clockwise direction.

Answer 1

Net force acting on the loop = F

$F=\frac{{\mu }_{0}I{I}^{{}^{\prime }}c}{2\pi a}-\frac{{\mu }_{0}I{I}^{{}^{\prime }}c}{2\pi b}$

$F=\frac{{\mu }_{0}I{I}^{{}^{\prime }}c}{2\pi }[\frac{1}{a}-\frac{1}{b}]$