Two long, parallel wires are spaced $2$ m apart in air, and you have established a current of $1$ A in each. The force per unit length that each wire exerts on the other is approximately

$2{10}^{-7}\frac{N}{m}$

$2{10}^{-5}\frac{N}{m}$

$1{10}^{-7}\frac{N}{m}$

$2{10}^{-5}\frac{N}{m}$

$2{10}^{-6}\frac{N}{m}$