An oil drop of 12 excess electrons is held stationaty under a constant electric field of `2.55xx10^(4) NC^(-1)` in Millikan's oil drop experi,ment. The density of the oil is `1.26 g cm^(-3)`. Estimate the radius of the drop. `(g = 9.81 ms^(-2) , e = 1.60xx10^(19) C)`

Explanation

To solve the problem of estimating the radius of an oil drop with 12 excess electrons held stationary under a constant electric field, we will follow these steps:

### Step 1: Calculate the total charge on the oil drop
The total charge \( q \) on the oil drop can be calculated using the formula:
\[ q = n \cdot e \]
where:
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