Hi, I am trying to learn more about electromagnetic induction because I want to build a generator for a wind turbine. I am a bit confused about something, hopefully someone out there can help me! I recently opened a bike dynamo. It contains a permanent magnet that can rotate, and the magnet has 4 north poles and 4 south poles (I figured that out using another magnet); see attached drawing. A single coil of copperwire is surrounding the magnet. Now what I understood is that if a south pole is moved inside a coil, it should give rise to a current that has a direction opposite to a current initiated by the same movement of a north pole. That would mean that at any given timepoint, there should always be an equal amount of current trying to flow from both directions, resulting in no net current. Yet it works! Can anybody explain why??