The magnitude of electric field intensity E, such electron, placed in the field, would experience an electric force equal to its weight is :
Strength of elelctric field is given as:
E=Fqo
Here, qo=e;F=mg
eE=mg
E=mge
E=9.109×10−31×101.6×10−19
E=5.69×10−11NC−1