1. The problem statement, all variables and given/known data 1.a ball is attracted to both positive and negative charge. state whether the ball has negative, positive, or no charge 2.why does electroscope use gold for the "leaf"?can others metal be used? 3.http://www.sciencebyjones.com/induction.gif [Broken] i do not understand that event 2. Relevant equations 3. The attempt at a solution 1.i do not know.same charge = repel, different charge = attract, no charge = nothing happen.how can a ball attract both positive and negative 2.do not know why it uses gold.maybe another metal can be used 3.i understand the right rod with positive charge will attract negative charge on middle rod.why left rod with positive charge attracts positive charge on middle rod? and at second figure,how can the it be like that? shouldn't the positive charge and negative charge on the middle rod mix again so that middle rod neutral?