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In the famous Millikan oil-drop experiment, tiny spherical droplets of oil are sprayed into a uniform...

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Physics

In the famous Millikan oil-drop experiment, tiny sphericaldroplets of oil are sprayed into a uniform vertical electric field.The drops get a very small charge (just a few electrons) due tofriction with the atomizer as they are sprayed. The field isadjusted until the drop (which is viewed through a small telescope)is just balanced against gravity, and therefore remains stationary.Using the measured value of the electric field, we can calculatethe charge on the drop and from this calculate the charge e of theelectron. In one apparatus, the drops are 1.40 mm in diameter andthe oil has a density of 0.850 g/cm3.

a) If the drops are negatively charged, which way should theelectric field point to hold them stationary? Up or down? Pleaseexplain your reasoning. (1)

b) If a certain drop contains four excess electrons, whatmagnitude electric field is needed to hold it stationary?Please express your answer to three significant figures.(2)

c) If you measure a balancing field of 5183 N/C for anotherdrop. How many excess electrons are on this drop? Pleaseexpress your answer as an integer. (2)

Answer & Explanation Solved by verified expert
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PART AThe gravitational force is acting downwards and hence we requrea force directing upward to balance the gravitational force Weknow    See Answer
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