Poisson's equation sets the Laplacian proportional to the negative of the density of this quantity.
This quantity equals isospin plus one-half the sum of baryon number, strangeness, charm, bottomness, and topness, according to the revised Gell-Mann-Nishijima formula for it. This quantity's conservation law can be written as "del dot J plus d-rho d-t equals zero". Poisson's equation sets the Laplacian proportional to the negative of the density of this quantity. This quantity collects in opposite values on either side of a capacitor, and its time-derivative is the current. The electric force between two objects is proportional to the product of this quantity for each object, according to Coulomb's Law. For 10 points, name this quantity measured in coulombs, which is positive for a proton.
This quantity equals isospin plus one-half the sum of baryon number, strangeness, charm, bottomness, and topness, according to the revised Gell-Mann-Nishijima formula for it.
charge [prompt on Q]