In electrical insulators (e.g. glass, wood, diamond, etc.), neither protons nor electrons can move beyond their "parent" atom or molecule --- i.e. both protons and electrons have "zero mobility" in insulators. Nevertheless, we observed in class that insulating objects (pith balls, wooden blocks, pieces of paper) are polarized by, and attracted to, a nearby charged object.
Explain how insulators become electrically polarized despite the "zero mobility" of both types of charge carrier. Include a conceptual sketch showing the location of protons and electrons before and after the insulator is polarized.