Question

In Milikan’s experiment, a static electric charge on the oil drops was obtained by shining X-rays. If the static electric charge on the oil drop is –1.282 × 10¹⁸C, calculate the number of electrons present on it.

Answer 1

Charge on the oil drop = 1.282 ×10¹⁸C
Charge on one electron = 1.6022 × 10¹⁹C
∴Number of electrons present on the oil drop
= \(\frac{1.282\times10^{-18}C}{1.6022\times10^{-19}C}\)
= 0.8001 × 10¹ = 8.0