A current of 10A passes through two very long wires held parallel to each other and separated by a distance of 1m. Wha is the force per unit length between them ?

Explanation

`i_(1)=i_(2)=10A`
r=1m
`(F)/(l)=(mu_(0) i_(1) i_(2))/(2 pi r)`
`=(4pi xx10^(-7)xx10xx10)/(2pi xx1)`
`(F)/(l)=2xx10^(-5) Nm ^(-1)`.