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August 27, 2014

Homework Help: PHYSICS

Posted by JOTHEY on Saturday, March 6, 2010 at 9:59pm.

In the early 1900s, Robert Millikan used small charged droplets of oil, suspended in an electric field, to make the first quantitative measurements of the electronís charge. A 0.67-um-diameter droplet of oil, having a charge of +e, is suspended in midair between two horizontal plates of a parallel-plate capacitor. The upward electric force on the droplet is exactly balanced by the downward force of gravity. The oil has a density of 860 kg/m^3, and the capacitor plates are 4.0 mm apart.

What must the potential difference between the plates be to hold the droplet in equilibrium?

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