How to find Magnetic Force between Two Infinite Parallel Conductors
Channel: V H Apni Physics
Date: 2014-07-30

You might expect that there are significant forces between current-carrying wires, since ordinary currents produce significant magnetic fields and these fields exert significant forces on ordinary currents. But you might not expect that the force between wires is used to define the ampere. It might also surprise you to learn that this force has something to do with why large circuit breakers burn up when they attempt to interrupt large currents.
For more information you can see:
http://en.wikipedia.org/wiki/Amp%C3%A8re%27s_force_law