Two long straight current$-$carrying wires run parallel to each other. The current in one of the wires is $5\mathrm{.}1$ A$,$ their separation is $3\mathrm{.}6$ cm and they repel each other with a force per unit length of $2\mathrm{.}010-4$ N$/$m$.$

$($a$)$ Determine the current in the other wire.

$7\mathrm{.}1$ A

$($b$)$ Determine if the currents are in the same or opposite direction.

oppositesame$$

$($c$)$ Determine what will happen if the direction of one current is reversed and tripled. $($Select all that apply.$)$

The wires are attracted to each other.The force per unit length is increased by a factor of $3.$The wires are repelled by each other.The force per unit length is decreased by a factor of $3.$