# Recent content by David George

1. ### Question - electron mass & magnetic moment

I have to admit I didn’t think so. If the magnetic moment is calculated as ½ g q h / 2 pi 2 m, the mass is given. But is there not some magnetic effect on the electron when the mass is measured?
2. ### Question - electron mass & magnetic moment

Can an electron's mass and its magnetic moment be measured in the same experiment?

Thank you!
4. ### What is this?

I have no math training beyond high school 45 years ago, and I don’t remember much of it. However I am doing a project, and I find the series below is quite valuable. But I do not know what it is or what it is called. It is like this: X + 1 (1/x + 1/x^2 + 1/x^3 . . . ). It comes ever...
5. ### Magnetic Moment

Thank you blechman. If a potential difference of 13.6 volts is required to free the electron, do the particles gain some energy when they are free? Trying to visualize what actually happens, do the protons go one way and the electrons go the other way when the potential is on? Then won’t the...
6. ### Magnetic Moment

Thank you clem. What does magnetic moment refer to in this precession (going by wikipedia)? I read that it is measured in joules per tesla, I take that to mean joules per weber per square meter, with a weber being a change in magnetic flux. So the strength of the field changes, and that makes...
7. ### Magnetic Moment

Thank you blechman. I believe you about the spin (and textbooks scare me). Passing the proton through the magnetic field, this means the proton is accelerated, right? So it will gain mass?
8. ### Magnetic Moment

This is a question about proton magnetic moment. Does magnetic moment mean moment of inertia, as in resistance to change? Also it seems like this must be measured on an accelerated proton. Is that so, and if so, how is the proton accelerated? Is it a bare proton, or part of a larger system? (I...
9. ### Proton Mass

I think the fundamental physics is where I am looking. The problem which prompted me to post is as follows. The CODATA respective values for the electron and proton masses in kilograms are 9.10938215 e-31 and 1.672621637 e-27. I am trying to follow an idea or scenario in which the electron...
10. ### Proton Mass

Thank you folks for pointing me in the right direction, I appreciate it very much. The questions below may be scatter-brained, but I appreciate any response to help focus. From google search it appears that mass spectrometers are measuring the mass-to-charge ratio of ions, which I take to...
11. ### Proton Mass

rbj – I feel the same way: that it is the electron-proton ratio that is fundamental, not the electron-kilogram (particularly since the kilogram bar seems to be losing mass). (I have a problem with quarks as “fundamental” but I won’t go there for now.) mgb – Thank you, that is what I was...
12. ### Proton Mass

Thank you MGB, I am wondering how the proton mass is measured or derived, in the sense that the precision is pretty amazing to me – I can dimly understand that a specific value for the electron could be defined, then working from that value the experimenters or theorists would be able to...
13. ### Proton Mass

I read on NIST CODATA that electron mass is a fundamental constant. I take from this that proton mass is not fundamental. I also read it is possible that proton-electron mass ratio may vary. So I wonder how proton mass is measured or derived. I have no training in physics, however in studying a...