There's a north pole at one end ... Calculating that magnetic field, B, was the tricky part. But the equation he came up with, the one that we now call Ampere's Law, allowed him - and future ...

When an electric current flows through a conductor, it generates a magnetic field around it, as described by Ampère's Law. Conversely ... Magnetic poles are the areas of the magnet where the ...

Today, electromagnetic induction powers most electric motors, along with a phenomenon described in Ampere's law (involving the forces generated between the magnetic ... for steel poles to ...