If two wires run parallel and the current passes through both wires in the same direction, which happens to the wires?
a.) the wires move together because the magnetic field of each wire attracts the other wire.
b.) the wires move apart because the magnetic fields of each wire are opposite, so they repel each other.
c.) the wires move together because the current of one wire pulls the other wire closer.

A.) The wires move together because the magnetic field of each wire attracts the other wire.

Explanation:

As we know that the current in two wires are along same direction

so here magnetic field due to one wire on the adjacent wire will produce magnetic force

this magnetic force is given as

since the direction of length vector is along the current in the wire so here the force on two wires due to magnetic field of its adjacent wire is always towards each other.

So two current carrying wires will attract each other when current flows in the two wires in same direction

so correct answer will be

A.) The wires move together because the magnetic field of each wire attracts the other wire.

an obstruction