Two parallel wires separated by $4\mathrm{.}00$ cm repel each other with a force per unit length of $2\mathrm{.}0010-$e N$/$ m$.$ The current in one wire is $5\mathrm{.}00$ A$.($a$)$ Find the current in the other wire. $($b$)$ Are the currents in the same direction or in opposite directions