Question

What will happen, if we connect two charged copper spheres through a conducting wire?

Answer 1

We know that, if two bodies at different temperatures are kept in contact, heat flows from the body at a high temperature to the body at a low temperature. Likewise, water flows from the jar having a high water level to the jar having a low water level.
Similarly, if we join two charged conductors through a conducting wire, the electrons will flow from the conductor having more electrons to the conductor having less (or no) electrons. The movement of electrons stops only when the number of electrons in both the conductors becomes equal.