5.A Water drop of radius 2.0 micro-meters is suspended in the atmosphere where the E-field's value is 500 V/m . How many electrons are there?
9.A 120-keV electron is fired directly toward a flat large plastic sheet with a charge density of -2 micro C/m^2. From what distance must the electron be fired if it is just to fail to strike the sheet?
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ok i solved number 5.it was easier than i expected. #9 i dont know how to start..
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