Two very large horizontal sheets are 4.25 cm apart and carry equal but opposite uniform surface charge

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Two very large horizontal sheets are 4.25 cm apart and carry equal but opposite uniform surface charge densities of magnitude σ. You want to use these sheets to hold stationary in the region between them an oil droplet of mass 324 µg that carries an excess of five electrons. Assuming that the drop is in vacuum,
(a) Which way should the electric field between the plates point, and
(b) What should σ be?
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College Physics

ISBN: 978-0321601834

7th edition

Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou

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