Trivia Question 7 Answer
These forces are: 1. Gravity, 2. Electromagnetism, 3. Strong Force, and 4. Weak force. The strong force (an attractive force between protons and neutrons involving gluons) and weak force (a force involved in beta decay) act over very short distances. (Of course there is the continued effort to unify all forces with one underlying unified model that can account for 'quantum gravity, ' but despite a myriad of string theories and other approaches, a unified theory has not yet been found.)
All 4 forces have some impact on the practice of radiology, but understanding the principles of electromagnetism is particularly relevant.