E = k * |q| / r²
The equation E = k \cdot \frac|q|r^2 describes the electric field E created by a point charge q . Here, k is a constant known as Coulomb's constant, which helps quantify the strength of the electric field. The term |q| represents the absolute value of the charge, while r is the distance from the charge to the point where the electric field is being measured.
The electric field E indicates the force experienced by a unit positive charge placed in the field. As the distance r increases, the electric field strength decreases rapidly, following an inverse square relationship. This means that doubling the distance reduces the electric field to a quarter of its original strength, illustrating how electric fields weaken with distance from the source charge.