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Answer:
There are four fundamental forces in the universe. One is gravity. You know what that's all about, and gravity is the large scale organizing force in the universe. The second force is the electromagnetic force. Not the electric force and not the magnetic force, the electromagnetic force. It isn't possible to have a magnetic field without the movement of charged particles. It's that simple. And that's why the elctromagnetic force is a single force. Last are the strong force and weak force (the strong interaction and the weak interaction). These are nuclear forces, and the strong force holds protons together while the weak force oversees some types of nuclear decay.
That's all there are. Physicists are working to see if they can find ways that the forces can be combined using high energy physics (accelerators), and they've found the particles that carries the "combination" of the electromagnetic and weak forces, the so-called electro-weak force, the W and Z bosons. Other particles have been theorized, but it takes bigger and bigger accelerators (sometimes known as atom smashers) to do the research to see if they can be found.
You'll find some links below to relevant posts at Wikipedia.
First answer by Quirkyquantummechanic.
Last edit by Quirkyquantummechanic.
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