The force that affects all particles in a nucleus and acts only at short range is the strong nuclear force.

Here's why:

* Short Range: The strong nuclear force is incredibly strong but acts over a very short distance, roughly the size of a proton or neutron. This is why it's called a "short-range" force.

* Affects all Particles in the Nucleus: The strong force is what holds protons and neutrons together in the nucleus of an atom, overcoming the electrostatic repulsion between the positively charged protons. It also binds quarks together to form protons and neutrons.

Let me know if you want to learn more about the strong nuclear force!