Alfang said:I get all that. but the string is nevertheless moving in front of that magnet, and that is pushing and pulling on the magnet itself albeit a small amount of course.
Can you explain why you think the string moving in front of the magnet exerts force on the magnet itself?
EDIT
err.. I left out the word 'significant' above =p
What I meant is why do you think this is significant in this case? The force is much too small to have any effect on the magnet itself..