The term that describes a model where charge takes up no space and acts uniformly on surroundings is a point charge.

Here's why:

* Point Charge: This model treats all the charge as concentrated at a single point in space. It has zero dimensions and no spatial extent. This simplification allows for easier calculations, especially when dealing with electric fields and forces.

* Uniformity: The point charge model assumes that the charge's influence is felt equally in all directions, which is why it's considered to act uniformly on its surroundings.

While the point charge model is a simplification, it's a very useful tool in understanding the basics of electromagnetism.