Question

What did Millikan find about the charge on an oil droplet?

Options

• It was always equal to the specific charge \[e/m\].

• It depended only on the material used as the cathode.

• It was always the same as the speed of light.

• It was always an integral multiple of an elementary charge.

Answer 1

Millikan found that the charge on an oil droplet was always an integral multiple of an elementary charge. This result established the quantisation of electric charge.