A small drop of water is suspended motionless in air by a uniform electric field that is

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A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8480 N/C. The mass of the water drop is 3.50 × 10-9 kg.
(a) Is the excess charge on the water drop positive or negative? Why?
(b) How many excess electrons or protons reside on the drop?
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Physics

ISBN: 978-1118486894

10th edition

Authors: David Young, Shane Stadler

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