# Coulomb's law facts for kids

**Coulomb's law** is a function developed in the 1780s by physicist Charles-Augustin de Coulomb. It explains how strong the force will be between two electrostatic charges. Electrostatic means electric charges without any motion.

## Direction

Let's think of two electric charges existing in an empty space. If the two charges are opposite, (+) and (-) charges for example, they will attract each other. And if two charges are both the same, both (+) or both (-) for example, they will push each other. This is similar to how magnets act, as N and S attract each other, and as N and N, S and S push each other.

This is because electric charges make an electric field. If two fields exist in the same space at the same time, then the two fields exert (~ put) force on each other. The force they make on each other is called 'Coulomb's force' or the **electrostatic force**. Coulomb's law explains how big the force will be.

## Scale

Coulomb's law explains the scale between two electric charges. The scale of electrostatic force follows the function below.

Coulomb's law explains that the force scale F is relative to ratio of ,.

and are the scales of each electric charge. is the distance between the two electric charges. And has a certain value. It does not change relative to , or . While remains constant, when multiples of and become bigger, the **electrostatic force** will also get bigger. When the distance becomes bigger, the electrostatic force will become smaller by the ratio of .

The exact size of is N m^{2} C^{−2} (or m F^{−1}). This constant is called **Coulomb's force constant** or the electrostatic force constant.

## Inverse-square law

The relation between the force of pushing or pulling (F) and the distance between the particles () follows the Inverse-square Law. Inverse-square law means that when the distance grows bigger, the force gets weaker by the ratio . Gravitation, Electromagnetic radiation, and sound loudness also follow this law.

## Related pages

- Coulomb, the SI unit of electric charge named after Charles-Augustin de Coulomb
- Inverse-square law, the physical law that shows the relation between distance and Intensity.
- Electrostatic
- Magnetic

## Images for kids

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Agnodice |

Aglaonice |

Mary the Jewess |

*Kiddle Encyclopedia.*