A small drop of oil is suspended motionless in the air by a


A small drop of oil is suspended motionless in the air by a uniform electric field that is directed upward and has a magnitude of N/C. The oil has a density of 0.8 g/cm^3.

A) Is the excess charge on the drop positive or negative? Why?

B) What is the mass of the drop?

C) What is the volume of the drop? How big is it?

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Physics: A small drop of oil is suspended motionless in the air by a
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