The electric field at the point q due to Q is simply the force per unit positive charge at the point q : E = F/ q E = KQ/r 2 The units of E are Newtons per Coulomb ( units = N/C ). The electric field is a physical object which can carry both momentum and energy. It is the mediator (or carrier) of the electric force.
In all of these experiments, we are manually moving electrons from one material to another. Your hair stands up because it is full of electrons. The electrons don’t like each other and are trying to get as far away from each other as possible. The balloon sticks to the wall because it creates an induced charge.