3. If you rub cotton on human hair, by pulling on a t-shirt for example, what charge would your hair end up with? 4. If you charged a balloon by touching it with a charged ebonite rod (recall, ebonite gets a

3. If you rub cotton on human hair, the hair will typically end up with a **positive** charge. Electrons are transferred *from* the hair *to* the cotton, leaving the hair with a deficiency of electrons (and thus a positive charge).<br /><br />4. If you charge a balloon by touching it with a charged ebonite rod, the balloon will acquire the **same** charge as the rod. Touching (charging by contact) results in charge transfer until both objects reach the same potential. Ebonite rods typically acquire a **negative** charge when rubbed with fur, so the balloon will also become negatively charged.<br />