Question: Two very large horizontal sheets are 4.25 cm apart and carry equal but opposite uniform surface charge densities of magnitude . You want to use

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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IDENTIFY The sheets produce an electric field in the region between them which is the vector sum of the fields from the two sheets SET UP The force on the negative oil droplet must be upward to balance gravity The net electric field between the ... View full answer

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