Physics - Magnetism Question with Solution | TestHub

Two long conductors, separated by a distance $\mathrm{d}$ carry current ${\mathrm{I}}_1$ and ${\mathrm{I}}_2$ in the same direction. They exert a force $F$ on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to $3\mathrm{d}$. The new value of the force between them is