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## Main Question or Discussion Point

I am studying relativity by myself. There is one problem in the book which says that the 4-dot product of the Minkowski force and proper velocity is zero. But again it say that qE.u = change in energy over time. Is there a contradiction? If not, Am I missing something important.

here q is the charge

E is the field

and u is a velocity vector.

Thanks

here q is the charge

E is the field

and u is a velocity vector.

Thanks