Here's why:

* Electric field strength decreases with distance: The electric field strength created by a point charge or a distribution of charges weakens as you move further away from the source.

* Inverse square law: The electric field strength is inversely proportional to the square of the distance from the source. This means if you double the distance, the field strength becomes four times weaker.

Example: Imagine a single positive charge. The closer you are to the charge, the stronger the electric field you experience. As you move further away, the electric field gets weaker.