Question

Calculate the force per unit length a long sraight wire carring of 4.0 A due to a parallel wire carrying current of 6.0 a . This distance between the wire is 3.0 cm.

Answer 1

The force per unit length between two current carrying conductors(wires) separated by distance 'r' is given by $\frac{F}{L}=\frac{M_0{I}_1{I}_2}{2\pi r}$

$=(4\times {10}^{-7})\left(4\right)\left(6\right)(2\times \pi +0.03)$

$=1.6\times {10}^{-4}$n/m.