Starting from scratch, Michel.
Attractive forces acting on the electron at or near the earth's surface.
1, At the Bohr Radius 8.24e-8 newton
2, Attached to an H2O molecule 6.4e-11 newtons
3, The earth's fair weather field 2.0e-17 newtons
4, The earth's gravity field attractive 8.9e-30 newtons,
5, or could it be gravity repelled 8.9e-30 newtons?
In the latter case, if it is released in an evacuated vertical
tube the direction of force, 4, or 5, can be determined, provided
the tube is virtually free of extraneous electrical fields.
Shining a pulse of light on a Cs-CsO film on a silver-plated
foil placed on the bottom of the tube and looking for
arrival of the electrons about 0.3 seconds or so later
(3.0 meters/sec or so) using a faraday cup tied to an electrometer
capable of femto-coulomb or femto-ampere currents
(and the LED or other Photon source) at the top.
If no such charge or current is detected, then gravity attracts
electrons.
Fred
