The magnitude of the electric field at a distance, r, from an infinitely-long wire with charge per unit length, λ, is given by: \[\begin{aligned} E = \frac{\lambda}{2\pi \epsilon_0r}\end...The magnitude of the electric field at a distance, r, from an infinitely-long wire with charge per unit length, λ, is given by: E=λ2πϵ0r A section of length, l, of the other wire carries charge, q=lλ, so that the force on that section of wire has a magnitude: FE=qE=λl(λ2πϵ0r)=λ2l2πϵ0r And the force …
