Nthis example we will use the quantization of charge to determine the number of excess electrons in an object. (a) a large plastic block has a net charge of −1.0μc=−1.0×10−6c. how many more electrons than protons are in the block? (b) when rubbed with a silk cloth, a glass rod acquires a net positive charge of 1.0 nc. if the rod contains 1.0 mole of molecules, what fraction of the molecules have been stripped of an electron? assume that at most one electron is removed from any molecule.