1. The problem statement, all variables and given/known data Based on a lab we did at school, we charged a Styrofoam plate by rubbing it against wool and determined that it attracted pieces of paper but repelled pieces of aluminum foil. Can anyone clarify why this is because I believe that both the pieces of paper and aluminum foil are neutral so wouldn't they both attract? 2. Relevant equations N/A 3. The attempt at a solution My only reasonable explanation is that the aluminum foil is conductive and picks up the electrons from the negatively charged Styrofoam plate and repel while the pieces of paper which act as an insulator attract to the plate. All help is very much appreciated!