Electron has Smallest Negative Electric Charge Possible
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Physical Law
The electric charge on the electron is the negative charge with the smallest possible magnitude that can be directly observed.
Justification
Electric charge has been observed as being quantized.
The quantum of positive charge is defined as being the elementary charge.
The electron bears a negative charge exactly equal in magnitude with the positive charge on the proton.
Sources
- 1958: C.A. Coulson: Electricity (5th ed.) ... (previous) ... (next): Chapter $\text {I}$: Preliminary Survey: $\S 1$. Electrostatics