Sadly this time we have no winner for the ScrapLabs Challenger – #2 (http://blog.scraplabs.in/?p=119)! After reading over 300 emails on 50 threads we could find no entry that answered this convincingly. Though this provoked prolonged discussions with many students and provided them with an insight into concepts like magnetism, induction and electricity.
However, we do have a featured-commendation which was the closest to the correct answer. 🙂
The solution is posted and you can check it here: http://blog.scraplabs.in/?p=170