This law explains why two surfaces rubbed together will attract each other.
A Cooper pair is created to satisfy this statement in Andreev  (on-DRAY-eff)  reflection. This statement is a consequence of the symmetry of a wavefunction with respect to rotation, since the U(1)   gauge  (U-one gayj) is invariant upon scalar addition. The continuity equation equivalent to this law says that the current density is divergence-free at steady-state. This law explains why inserting a dielectric into a capacitor changes voltage by the same factor as the capacitance. Kirchhoff's (*)  first rule, a consequence of this law, requires that current into a junction equals current out of it. This law explains why two surfaces rubbed together will attract each other. For 10 points, name this law, the basis of static electricity, which states that the total number of Coulombs in a system is constant.
A Cooper pair is created to satisfy this statement in Andreev  (on-DRAY-eff)  reflection.
law of  conservation of charge  [or electric  charge conservation ; prompt on partial answer]