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Consider an electron in front of metallic surface at a distance d (treated as an infinite plane surface). Assume the force of attraction

Calculate work in taking the charge to an infinite distance from the plate. Taking d = 0.1nm, find the work done in electron volts. [Such a force law is not valid for d < 0.1nm].

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Work done by an external agency

With d = 0.1nm, energy

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