Force,F on electrons with charge ‘q” in electric field E.
Mass of an electron in weight m_E in gravity, and g = m_E*.
F=m_E*g is the minimum weight for electric force to equal its weight
This means that q*E is equal to m_E*g
Hence, E= m_E*g/q
m_E = 9.1×1031 Kg
g = 9.8m/s2
q = 1.6×10^-19 C
We get the numbers by putting in our numbers
E = 5.6×10-11V/m the required electric fields.