Proton has Smallest Positive Electric Charge Possible
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Physical Law
The electric charge on the proton 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 proton bears exactly that elementary charge.
Sources
- 1958: C.A. Coulson: Electricity (5th ed.) ... (previous) ... (next): Chapter $\text {I}$: Preliminary Survey: $\S 1$. Electrostatics