# How to determine the charge on electron?

The charge on the electron was determined by Millikan by his Oil Drop Experiment.

### Explanation

The charge of the electron is equivalent to the magnitude of the elementary charge (e) but bearing a negative sign. Since the value of the elementary charge is roughly 1.602 x 10-19 coulombs (C), then the charge of the electron is -1.602 x 10-19 C.

• The experiment with Millikan is important since it defined the charge on an electron.
• Millikan used a very basic, very simple system in which the behaviour of gravitational, electrical, and (air) drag forces was controlled.