Coulomb's law, developed in the 1780s by French physicist Charles Augustin de Coulomb, may be stated as follows:

The magnitude of the electrostatic force between two point electric charges is directly propotional to the product of the magnitudes of each charge and inversely proportional to the square of the distance between the charges. The direction of that force is directed towards a point between them if they are of oppotite charge to each other and away from it if they are both of the same type of charge.

The Coulomb Force is the electric force (that acts on charges) is given by the following equation:

where e_o is the permitivitty of free space,

Q₁ and Q₂ are the charges and

r is the distance they are apart

The Coulomb force is a force - so it is a vector!

(a positive result indicates a repulsive force (two negative charges or two positives will result in that), whereas a negative result indicates an attractive result (one charge of each type will result in that))

The gravitational force (that acts on masses) is given my the following equation:

where G is the gravitational constant, m₁ and m₂ are the masses and r is the distance they are apart

(the negative sign shows that the force is always attractive)

Consider two electrons one metre apart:

mass of the electron m_e = 9.11 x 10^-31 kg

charge on the electron Q_e = 1.60 x 10^-19 C

G = 6.67 x 10^-11 m³ kg^-1 s^-2

e_o = 8.85 x 10^-12 F m^-1

The gravitational force acting on the two electrons is 8.3 X 10 ^-61 N

The coulomb force acting on the two electrons is 2.3 x 10^-28 N

Therefore the coulomb force is 10³² times bigger than the gravitational force (100,000,000,000,000,000,000,000,000,000,000 times bigger).... that's why we have to think of charges as being in a different dimension to us.... they experience hills and dales of electric field rather than gravitational field.

LOJ MARCH 2002