Final answer:
The 20-letter term referring to the force between electrically charged particles is the 'electromagnetic force', which includes both static and magnetic phenomena.
Step-by-step explanation:
The 20-letter word for a type of physical interaction that occurs between two electrically charged particles is electromagnetic force. This force is one of the four fundamental forces of nature and includes both static electricity and magnetism. An electric field represents the area around a charged particle where its force can be felt. An individual charged particle, such as an electron, carries the smallest unit of negative electric charge. When two charged particles interact, they can experience electrostatic attraction if their charges are opposite, or electrostatic repulsion if their charges are the same. Coulomb's law mathematically describes how the electrostatic force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.