Question

Which of the Millikan's method is used for the determination of charge?

Answer 1

Millikan oil- drop experiment is used for the determination of the charge.

• Millikan oil- drop experiment was the first direct experiment to determine the electric charge of a single electron.
• The apparatus included two metal plates that were placed at a distance with the help of an insulated rod.
• There were four holes in the plate, and from three, the light was allowed to pass through them.
• The left hole was used to view the experiment from the microscope.
• Ordinary oil was not used for this experiment as it would evaporate by the light heat, which may cause an error in the experiment.
• So, for this vacuumed apparatus, oil of low vapor pressure was used.
• The scientist concluded that the charge on any particle would always be an integral multiple of e $(1.6\times {10}^{-19})$

Hence, the answer is Millikan oil-drop experiment.