If the voltage is the same, the current is automatically the same through either wire. The orbital motion of electrons. An electric current through a wire. The gravitational attraction between protons and electrons. A friend hands you a rectangular piece of metal, and claims that it has a single magnetic pole, located at the exact center of the object.
Most materials are magnetic because the domains are randomly aligned.
Increasing the alignment of magnetic domains in a piece of iron increases its magnetic field. Dropping a piece of iron repeatedly will cause the domains to line up, magnetizing the object. Stroking a piece of iron with a permanent magnet will line up the domains and magnetize it. You have four complete magnets, each one having a north and a south pole. One magnet has a south pole, one has a north pole, and two pieces are unmagnetized metal.