Kirchhoff's junction rule is an application of the conservation of this quantity, whose time derivative is current.
This quantity is equal to isospin plus the term hypercharge divided by two, according to the Gell-Mann–Nishijima formula. The net outward flux equals this quantity divided by the permittivity of free space, according to one of Maxwell's equations. Quarks have a value of positive two-thirds or negative one-third for this quantity. Kirchhoff's junction rule is an application of the conservation of this quantity, whose time derivative is current. Collected on the plates of a capacitor, this quantity is often measured in coulombs. For 10 points, name this quantity that is positive for protons and negative for electrons.
This quantity is equal to isospin plus the term hypercharge divided by two, according to the Gell-Mann–Nishijima formula.
{electric charge}