* Directly proportional to the product of their charges: This means that if you increase the charge of one object, the force increases proportionally.
* Inversely proportional to the square of the distance between their centers: This is the key part for your question. It means that as the distance between the charges increases, the force decreases rapidly.
Specifically:
* If you double the distance, the force becomes 1/4th of its original value.
* If you triple the distance, the force becomes 1/9th of its original value.
* If you halve the distance, the force becomes 4 times stronger.
In summary: The electric force weakens significantly as the distance between charges increases. This is why, for example, the electrical attraction between the Earth and the Moon is much weaker than the attraction between the Earth and a nearby object.
