According to Ampere's law, the relationship between the force on two parallel conductors, carrying an average current of I1 and I2, and displaced with a distance of r for a section of length l, is given by:
1
F \(\propto \ \frac{I_1I_2L}{r^2}\)
2
F \(\propto \frac{I_1I_2L^2}{r}\)
3
F \(\propto \frac{I_1 I_2 L}{r}\)
4
F \(\propto \frac{I_1I_2}{r}\)