From what distance should a 100 eV electron be fired towards a large metal plate having a surface charge density of -2.0×10^-6 C-m^-2, so that it 'just' fails to strike the plate? (Electronic charge e=1.6×10^-19 C, epsilon0= 8.85×10^-12 C²m^-2, 1eV= 1.6×10^-19 J.)
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From what distance should a 100 eV electron be fired towards a large metal plate having a surface charge density of -2.0×10^-6 C-m^-2, so that it 'just' fails to strike the plate? (Electronic charge e=1.6×10^-19 C, epsilon0= 8.85×10^-12 C²m^-2, 1eV= 1.6×10^-19 J.)
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