Final answer:
The attraction between a proton and an electron is due to electrical fields, specifically the electromagnetic force, which causes particles with opposite charges to attract each other.
Step-by-step explanation:
The attraction between a proton and an electron is due to electrical fields. This attraction is a result of the electromagnetic force, which is responsible for the electromagnetic attraction between particles with opposite charges. As detailed in Coulomb's Law, a proton, which has a positive charge, and an electron, which has a negative charge, experience an attractive force towards each other. In contrast, gravitational and magnetic fields do not primarily account for the attraction between a proton and an electron; gravitational force is negligible at the subatomic level, and magnetic forces do not cause attraction between static charges. However, when in motion, protons and electrons can generate magnetic fields, but this is not the reason for their fundamental attraction. It is the electromagnetic force that predominantly governs the interaction between these two particles.