A copper strip AB and an iron strip AC are joined at A. The junction A is maintained at 0°C and the free ends B and C are maintained at 100°C. There is a potential difference between (a) the two ends of the copper strip (b) the copper end and the iron end at the junction (c) the two ends of the iron strip (d) the free ends B and C.

A copper strip AB and an iron strip AC are joined at A. The junction A

1.	A copper strip AB and an iron strip AC are joined at A. The junction A is maintained at 0°C and the free ends B and C are maintained at 100°C. There is a potential difference between (a) the two ends of the copper strip (b) the copper end and the iron end at the junction (c) the two ends of the iron strip (d) the free ends B and C.
Answer» The correct answer is all.