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Eugene Mosca wrote:
How about energy per unit charge?
Does this mean that the kinetic energy per unit charge of charged particle
in a beam passing through a surface is voltage?
No, that's not what I had in mind.
Loosely speaking, I was thinking of the energy-per-unit-charge of an
idealized test particle that had no kinetic energy, no gravitational
potential energy, et cetera.
More precisely, I was thinking of the part of the energy due solely to
the interaction of the particle's charge with the applied field. This
could be ascertained by comparing the energy of the charged particle
with the energy of an otherwise-similar uncharged particle.