Definition:Quark
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Definition
A quark is a theoretical elementary particle that is postulated to form one of the components of such as the proton and neutron.
The electric charge on a quark is an integer multiple of $\dfrac 1 3$ of the elementary charge $\E$.
Sources
- 1990: I.S. Grant and W.R. Phillips: Electromagnetism (2nd ed.) ... (previous) ... (next): Chapter $1$: Force and energy in electrostatics: $1.1$ Electric Charge (footnote)