- #1

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I have tried to derive a relativistic formula for work using the E = ϒmc^2 equation and that work is equivalent to change in energy. But I have not gotten especially far and everything is messy.

However, when looking at solutions to some harder problems I encountered the formula:

W = pc (1)

which I thought decribes the total energy of a massless particle, but this time it was used in connection with an electron changing directions (velocity but not speed) in a magnetic field.

So my question is, do you know if equation (1) holds for work done on/by all kinds of particles or do you have any other suggestion?

Thank you! :)