A \( 100 \mathrm{eV} \) electron is projected directly toward a large metal plate that has surfa...

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A \( 100 \mathrm{eV} \) electron is projected directly toward a large metal plate that has surface charge density of \( -2.0 \times 10^{-6} \mathrm{Cm}^{-2} \). From what distance must the electron be projected, if it is to just fail to strike that plate?
(1) \( 0.44 \mathrm{~mm} \)
(2) \( 0.20 \mathrm{~mm} \)
(3) \( 1 \mathrm{~mm} \)
(4) \( 0.30 \mathrm{~mm} \)
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