To determine the number of extra electrons on the oil drop, we need to calculate the ratio of the charge of the drop to the charge of a single electron.
We already know the charge of the drop, which is 4.8×10^−19 C, and we also know the charge of a single electron, which is 1.6×10^−19 C.
To find the number of extra electrons, we can divide the charge of the drop by the charge of a single electron:
Number of extra electrons = Charge of the drop / Charge of a single electron
Number of extra electrons = 4.8×10^−19 C / 1.6×10^−19 C
Simplifying the expression gives:
Number of extra electrons = 3
Therefore, there are 3 extra electrons on this particular oil drop.