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Charge comes in integer multiples of e and is globally conserved.
Force between two point charges follows an inverse-square law.
Force per unit positive test charge around a source charge.
Work per unit charge to bring a charge from infinity; equipotentials.
Field and potential of a dipole on axis vs equatorial plane.
Total flux through a closed surface equals enclosed charge over ε₀.
Charge stored per unit voltage; geometry sets the value.
Inserting a dielectric multiplies capacitance by the dielectric constant.
Combination rules for capacitor networks.
Work done in charging the capacitor equals stored field energy.