Hi! I sure like all you videos and they are very helpful to me, thank you. But I have a question about how charged insulators like for example a plastic ruler, can attract a conducter. I know that a conducter is neutral right? And the ruler is negatively charged/positive, but how is it the way they attract? Is it always that insulators attract conductors? In my science book it says that a negatively charged object repels negatively charged electrons. And positively charged object attracts negatively charged electrons.    Thanks! /Sara, ninth grade :)

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by saraspiano2 at December 30, 2011