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Q11

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

An oil droplet with excess electrons is observed between two parallel electrodes spaced apart. The droplet hangs motionless if the upper electrode is more positive than the lower electrode. The density of the oil is . What is the radius of the droplet?

Radius of the oil droplet

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Step by Step Solution

Step 1: Given information

Oil droplet is placed between the parallel plates of width . There are excess electrons in the oil droplet.

It is given that is the if upper electrode is more positive than the lower the droplet become stationary. (Density of oil )

Step 2: Equating the electrical force and weight:

Since the droplet become stationary the electrical force exerted by the plates balance the weight of the oil droplet .

Since we got the mass we can find the radius by the density formula.

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