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Measure the mass at different velocities and extrapolate to zero velocity.
There is other version of this device especially for photons. And most of physics have one of its version, as it's cheap toy:Crookes Radiometer:Nobody here studied physics or have physics at high school??
Electron accelerates and produces a magnetic field which resists the motion of the electron.Is the resistance to change of motion of the electron.... Its massIf true how do you find its rest mass?Or is the mass you refer to, not inertial mass?
I said "one of version".There is other version of Crookes radiometer that has no air inside and relies completely on momentum/energy of photon.
PmbPhy,In the case you are talking about, you need to do a different extrapolation.A charged particle moving in a circle is accelerating towards the centre and an accelerating charged particle emits radiation and loses energy.So it doesn't actually move in a circle, it spirals inwards.You have to extrapolate to the velocity it had before it lost some energy.Of course, if the speed is small, the rate of loss is low.On the other hand, if it's that low the relativistic effect is small enough to ignore so you can get the mass from equating 1/2 mv^2 with QVv = velocityV = accelerator voltage