Coulomb’s Law  

In 1785, Coulomb established the fundamental law of electric force between two stationary, charged particles. Experiments show that an electric force has the following properties:

(1) The force is inversely proportional to the square of separation, r², between the two charged particles.

(2) The force is proportional to the product of charge q₁ and the charge q₂ on the particles.

(3) The force is attractive if the charges are of opposite sign and repulsive if the charges have the same sign.

where K is the coulomb constant = 9 × 10⁹ N.m²/C².

The above equation is called Coulomb’s law, which is used to calculate the force between electric charges. In that equation F is measured in Newton (N), q is measured in unit of coulomb (C) and r in meter (m).

The constant K can be written as

where ε_ο is known as the Permittivity constant of free space.

□ ε_ο = 8.85 × 10^-12 C²/N.m²

مواضيع ذات صلة

Thermal conductivity

Molecular diffusion

Ionic conductivity

The drift speed

Electrical transients

الشرر المقدس

الحقول الكهربية والشرر

الخلق غير المرئي

عجائب الكهرباء

مصادر الطاقة الكهربائية

التيارات الكهربائية التي تجري إلى الابد

النقل الكهربائي وقانون أوم