1. The problem statement, all variables and given/known data You have a new unknown material. You want to get a rough approximation as to the location of the unknown material on the electrostatic series. You only have two tools at your disposal; some wax and a charge detector. Design an experiment (procedure) that will help you infer whether the unknown material is near the top of the electrostatic series (above wax) in the middle of the electrostatic series (near wax) or at the bottom of the electrostatic series (below wax). 2. Relevant equations I don't think there are any relevant equations. 3. The attempt at a solution I have no idea of how to find the TYPE of charge. I am thinking that the only way to solve this is if the charge detector has a known charge itself and I could separately compare their respective charges after the rubbing them together. Since the charge detector does not have a known charge, the only useful information it could give is IF the material has a charge. Or can charge detectors (e.g. electroscopes) measure polarity as well?