Which of the following statements about a metal wire in the steady state are true? select all that apply.

1. there may be a nonzero, uniform electric field inside the wire.
2. the net electric field everywhere inside the wire is zero.
3. there is a constant flow of mobile electrons inside the wire.
4. there may be excess charges in the interior of the wire.
5. there may be excess charges on the surface of the wire.
6. there is no net flow of mobile electrons inside the wire.
7. there are no excess charges in the interior of the wire.
8. the interior of the metal wire is neutral.
9. there cannot be excess charges on the surface of the wire.