One of the four main types of forces in the universe, electromagnetism draws electrically charged particles toward or away from one another according to their charge. There are positive, neutral, and negatives charges. The electromagnetic force is much stronger than gravity, but not as strong as the strong nuclear force. The electromagnetic force causes the negatively charged electrons in an atom to orbit the positively charged protons.
Electromagnetic force Term Timeline in A Brief History of Time
The timeline below shows where the term Electromagnetic force appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
...that has been used to understand electricity and magnetism. He said wavelike disturbances in the electromagnetic field would travel at constant speeds, just like ripples in ponds. The different wavelengths (the... (full context)
...and Steven Weinberg both put forward ideas on this force that linked it with the electromagnetic force in 1967. They said three types of particle called massive vector bosons carried this... (full context)
...is that at some high energy, the strong nuclear force would be weakened, and the electromagnetic and weak nuclear force would strengthen, so that all three would be equal. In this... (full context)
...while expanding rapidly, particles had enough energy for the strong and weak nuclear forces and electromagnetic force to be unified in a single force. As the universe cooled, these forces broke... (full context)
...the symmetry eventually break between the strong nuclear force, the weak nuclear force, and the electromagnetic force. This would bring the universe back to the slower rate of expansion and cooling... (full context)