Consider two infinitely long, parallel conductors carrying current in opposite directions. What is the net magnetic field midway between the conductors? The magnetic field lines form concentric circles, and the field at the midpoint between both conductors acts in the same direction. The magnetic field due to a straight conductor is directly proportional to the current flowing through it, and inversely proportional to its distance from the conductor. However, according to the principle of magnetic field superposition, the net magnetic field due to multiple conductors is the vector sum of the field due to the individual conductors. So, the net magnetic field magnitude midway between the conductors is proportional to the sum of the current's magnitude in the individual conductor. The magnetic field magnitudes at any arbitrary point from either conductor can be estimated using the principle of superposition. For points very far from the conductors, the equations become simplified. So, the net field magnitude due to two conductors drops more rapidly with distance than in the case of a single conductor.