Electric Charges Electric charges have four very important properties. Like charges repel one another and unlike charges attract one another.
Charge is quantized.
Electrical charge is always conserved. The force between charged particles varies as the inverse square of their separation. Conductors are materials in which charges move freely. Insulators are materials that don't readily transport charge. Coulomb's Law Coulomb's law describes the electrostatic force between two stationary, charged particles which are seperated by a distance r .