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that
If you are somehow getting these from E = sigma/2epsilon then I think
is incorrect because that relation does not apply to this situation.And Michael wrote to John D:
Outside a conductor with surface charge density sigma the field is
sigma/1epsilon.
Literally we onlyfar
consider the charge on the near side because the electric field from the
side does not penetrate the conductor. So there is no field to "always
always always" add from the far side of the conductor. We only add the
fields from the charges on the near side