Electric Charge: Electric charge is a fundamental property of matter and is a source of the electromagnetic force. It can be positive or negative, and objects with the same charge type repel each other, while objects with opposite charge types attract each other.
Electric Field Lines: Electric field lines are a visual representation of the direction and magnitude of an electric field. They start at positive charges and end at negative charges, and the density of the lines indicates the strength of the electric field.
Coulomb's Law: Coulomb's law states that the force between two stationary, electrically charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.