Here's why:
* Like charges repel: Particles with the same charge (both positive or both negative) will experience a repulsive force, pushing them apart.
* Opposite charges attract: Particles with opposite charges (one positive and one negative) will experience an attractive force, pulling them together.
This principle is fundamental to how electricity works, and it's responsible for phenomena like the attraction between a magnet and a piece of iron, or the bonding of atoms in molecules.
