I came across a question about charge accumulation. It states that if a steady current flows in a wire composed of a copper and iron wire of same area (see fig), will the charge accumulate on the junction or not?
My Approach: If I consider a battery is connected to the wire (driving the current in it), then it would be taking electrons from iron side and supplying to the copper. It would make the iron end +ve and copper end -ve. This drives electrons from junction to the end of iron wire making the iron sided junction +ve and copper sided junction -ve, overall developing a n electric field, which further drives the current.
So, according to me, electrons don't accumulate in the wire, but actually get's carried away by the battery (making wire +) and simultaneously supplied by the battery (making wire -ve) which makes the current to flow.
Otherwise, how can current flow in it??
Question: My final question is, am I right or not? Please explain this concept with a great detail to me.