I'm in grade 12 physics trying to understand how motors work. My teacher is useless. I read the official law, but I do not understand how it conceptually works. Here is the aplet he gave me, if you want to explain with respect to a visual. http://micro.magnet.fsu.edu/electromag/java/lenzlaw/index.html Thank you very much! I really need to understand this. It is the first thing that seems applicable to the real world.