1. The problem statement, all variables and given/known data Why when an insulated conductor is placed very close to the Van de Graaff generator dome, the conductor will have an excessive charge of the same sign as the dome? What is an insulated conductor?! why can the charge travel in air? 2. Relevant equations Electrostatics knowledge 3. The attempt at a solution I guess insulated conductor means it is a conductor but it is not earthed by the hands when manipulating it? When it places very near, they share charges by ionising the air particles?