What does galvanic current flow between?

Galvanic current typically flows between conductive materials, particularly metals and conductive non-metals when there is an electrochemical potential difference. This flow occurs as a result of an electrochemical reaction, often caused by the presence of an electrolytic solution (like water with dissolved salts) acting as a medium that facilitates the transfer of electrons.

In the context of the options presented, the choice that signifies the interaction between conductive non-metals (like carbon or some polymers that retain conductivity under specific conditions) and metals accurately describes the flow of galvanic current. This flow creates a situation where two different conductive materials come into contact, which can lead to corrosion or other electrochemical reactions.

Conductive non-metals and metals are prone to this interaction due to their opposing electrochemical properties, which can drive the galvanic process. Thus, option B accurately captures the essential condition for galvanic current flow.