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www.wikipedia.org (his life)
britannica.com
physics.info
http://www.physics-and-radio-electronics.com/electromagnetics/electrostatics/coulombs-law.html

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If we approach a plastic pen with a constant water flow, it remains unchanged; if instead I rub the pen on a cloth and break the balance between the charges inside the pen, it means that I loaded it electrically and then the pen’s charges and those of the water flow interact and there is an approach between pen and water
https://www.youtube.com/watch?v=89zBQe3d4dc&t=74s

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https://www.youtube.com/watch?v=rYjo774UpHI

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Coulomb’s second law states that, the force of attraction or repulsion between the two electrically charged particles is directly proportional to the product of magnitudes of two charges and inversely proportional to the square of the distance between two charges.
This force of attraction or repulsion between two charges is also depends on the medium in which charges are placed.

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Coulomb’s first law states that two charged particles of same charge (positive or negative) will repel each other and two charged particles of opposite charges (one positive and one negative) will attract each other.
In other words, if two positively or negatively charged particles are placed close to each other, they get repelled. On the other hand, if one positively charged particle and one negatively charged particle are placed close to each other, they get attracted.

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When you have two charged particles, an electric force is created. If you have larger charges, the forces will be bigger.
If you use those two ideas, and you add that charges can captivate and reject each other, you will understand Coulomb's Law.

F=k x q1q2/r2

F is the force between the two charges.
The distance between the two charges is r (Radius of separation), but you have to know that it is a distance. The q1 and q2 are values for the amount of charge in each of the particles. K is the constant of the equation.

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Coulomb's Law is one of the most famous basic ideas of electricity in physics. The law looks at the forces created between two charged objects. As distance increases, the forces and electric fields decrease. This simple idea was converted into a relatively simple formula.
The force between the objects can be positive or negative if themselves are captivated or rejected to each other. Charges that are closer together create greater forces.