- The following diagram shows a pair of long, straight, parallel
wires, separated by a small distance, r. If equal currents are
established in the wires, what is the magnetic field midway between
the wires?
Here’s How to Crack It
Let B 1 be the magnetic field due to Wire 1 and B 2 be the magnetic field due to Wire
- The total magnetic field at point P is just their vector sum, B 1 + B 2. Using the
second right-hand rule, we know that B 1 is directed counter-clockwise around Wire