Each wire sits in the magnetic field of the other, so each feels a force. Two currents in the same direction attract; two in opposite directions repel. Set the direction and size of each current and the separation, and watch the force change.
MissionSet both currents in the same direction, then predict whether the wires attract or repel.Streak 0Best 0
Two long parallel wires carrying current in the same direction:
currentssame direction
force per unit length ∝ I₁I₂/dattraction
separation d12 cm
Parallel currents in the same direction attract; in opposite directions they repel. The force grows with each current and falls with separation.