A community of Physics Phans!

As students of physics, we learn when studying Special Relativity that the speed of light is constant. When we study geometric optics, we learn that the speed of light slows down in a medium. This seeming contradiction leads to a completely understandable misconception about the nature of light.

I was looking at search terms that lead people to this website from Google and stumbled across this one: “the work done by the magnetic field on the charged particle during the semicircular trip.” Someone obviously was interested in how much work a magnetic field could “do”, and Google was kind enough to point them [...]