Two horizontal parallel plates are provided with a potential difference so that

Question

Two horizontal parallel plates are provided with a potential difference so that a uniform. vertical electric field is created between them. A fine spray of tiny oil droplets is injected into this field. Due to X-rays, some charges are created, which stick to the oil droplets. If the mass of one oil drop is 10^-12 gram, and it has a charge of 2 electrons on it, what should be the strength of the electric field so that the droplet stays fixed in one position (i.e. it neither falls nor moves upward).

Explanation / Answer

For the droplet to stay fixed the electric force must be equal to the droplet

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