What does the fundamental rule of static electricity state?

The fundamental rule of static electricity states that like charges repel while unlike charges attract. This principle is a cornerstone of electrostatics and is based on the behavior of electric charges. When two objects with the same type of charge—either both positive or both negative—are brought close to each other, they will push away from one another due to the repulsive force between them. Conversely, when a positive charge and a negative charge are brought near each other, they will attract, pulling together due to the attractive force between opposite charges. This understanding is essential in various applications, from explaining everyday phenomena (like static cling) to intricate operations in electronic devices. It helps in predicting the behavior of charged particles in systems and is foundational for further studies in electricity and magnetism.