Measuring the Electron’s Charge-to-Mass Ratio

Measuring the electron’s charge-to-mass ratio is the focus of this physics experiment. It recreates J. J. Thomson’s famous experiment from the end of the 19th century. Thomson used it to measure the charge-to-mass ratio of the electron.

This work also connects to Robert A. Millikan’s oil-drop exp...

Electrons play the leading role many areas of science and technology, as they possess electric charge, enabling them to carry current.

Electric charge, or q, is a physical property describing whether a unit of matter has more protons, making it positively charged, more electrons, making it negatively charged or an equal number of protons a...