Does a North Pole Magnetic Field Create AC in a Wire Passing Through?

[arevolutionist]

I fail to recall this concept. When only a north pole magnetic field is passed along a wire, and then the magnet passes the reversed direction, does the electric current become an AC? The wire never enters the south pole magnetic field.

 

[berkeman]

When the magnetic flux through a wire *loop* changes, that induces a voltage between the ends of the loop. If the flux is changing at a constant rate (like increasing linearly), the coil voltage is DC. If the flux is changing with time (like moving a magnet past a loop, or as in the secondary of a transformer), then the output is AC.