In a Millikan oil-drop experiment (Section 22-8), a uniform electric field of 5.78 x 105 N/C is maintained in the region between two plates separated by 8.56 cm. Find the potential difference (in V) between the plates.

The required potential difference is .

Explanation:

We know, electric field is nothing but the negative gradiant of potential. Mathematically, in three-dimension,

In one dimension, the magnitude of the electric field is

where '' is the applied voltage and ''is the distance through which the voltage is applied.

Given, .

So the required potential difference is

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

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