Question

What will happen if we exchange the electrodes

Answer 1

By Interchanhing the electrodes , do you mean connecting annode to positive and cathode to negative ? Because in general for electroplating annode is made up of the the metal that is to be plated on the surface of cathode with electrolytic solution. Where power supply is directed from cathode to annode through electrolytic solution breaking electrolytic solution leading to the formation of ions of the metal that is to be plated on cathode. If you connect cathode to negative and annode to positive instead of cathode to positive and annode to negative , I don't think the electrolytic process happens. Instead there accumulates posit8ve ions at negative channel and may lead to shortcut. But in most cases the process itself doesn't start.