http://blogs.howstuffworks.com/2010/09/02/how-does-an-electric-guitar-pickup-work/
Watch the vid, starting at 2:38, has a great graphic of it.
http://www.youtube.com/watch?v=lBAZepM5F_0&feature=player_embedded
In respect to the above post, what effect will an oscillating ferromagentic material above the coil have on said coils.(ie. guitar string) And what would the effect of the oscillating ferromagnetic material have on the said coils if magnetized from an outside source. (if magnets were placed...