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According to Coulomb鈥檚 law, the magnitude of electric force (F) that one small object (having charge\({{\bf{Q}}_{\bf{1}}}\)) exerts on another small object (having charge\({{\bf{Q}}_{\bf{2}}}\)) is directly proportional to the product of the charges on both the objects and inversely proportional to the square of the distance (r) between them.

The expression for Coulomb鈥檚 force is given as:

\(F = k\frac{{{Q_1}{Q_2}}}{{{r^2}}}\)

Here, k is the electrostatic force constant.

According to Newton鈥檚 law of gravitation, the magnitude of gravitational force (F) that one object (having mass\({m_1}\)) exerts on another small object (having mass\({m_2}\)) is directly proportional to the product of the masses on both the objects and inversely proportional to the square of the distance (r) between them.

The expression for gravitational force is given as:

\(F = G\frac{{{m_1}{m_2}}}{{{r^2}}}\)

Here, G is the universal gravitational constant.

A person is not normally aware of the electric force between two ordinary objects. This is because ordinary objects contain a large number of electrons and protons but in equal amounts, i.e., they are electrically neutral as a whole.