$(20$ points$)$ Two very long parallel wires are separated by a distance d$.$ The currents $I_1=3$A and the current $I_2=6A.$ The magnetic field on wire $2$ due to wire $1$ is $2{10}^{-5}T.$

$1-(5$ points$)$ Calculate the distance between the wires

$d=$ m

$2-(5$ points$)$ The magnetic field on wire $2$ due to wire $1$ is in the direction

$3-(5$ points$)$ The direction of the magnetic Force on wire $2$ is in the direction

$4-(5$ points$)$ The magnitude of the magnetic force per unit length on wire $2.$

F$/$L $=\frac{N}{m}$