Explain the electrification of bodies in contact.

When a glass rod is rubbed against silk, it is charged positively, while the silk is charged negatively. This is due to the fact that, during friction, the electrons from the rod are transferred to silk, that is, from the substance in which the forces of attraction to the atomic nucleus are less, to the substance in which these forces are greater, as a result there will be a lack of electrons in the glass rod. and in silk there is an excess.