By SR, relativistic energy and mass are proportional to the Lorentz factor γ, therefore, grow to infinity for v[itex]\rightarrow[/itex]c. This relationship for the relativistic mass has been confirmed by the Kaufmann experiment and its successors, via measuring the deflection of high velocity electrons by an electric and/or magnetic field.(adsbygoogle = window.adsbygoogle || []).push({});

My question is: is this really unambiguous proof of energy/mass increase? Or, could as well the effective electric (and/or magnetic) deflection force on the electron go to zero for v[itex]\rightarrow[/itex]c, such that the inertial mass (and energy) only appears to increase?

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# Proof of relativistic energy/mass to grow to infinity for v approaching c?

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