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A copper wire and an iron wire, each having an area of cross–section A and lengths L 1 and L 2 are joined end to end. The copper end is maintained at a potential V 1 and the iron end at a lower potential V 2 . If σ 1 and σ 2 are the conductivities of copper and iron respectively, then the potential of the junction will be?

A copper wire and an iron wire, each having an area of cross–section A and lengths L1 and L2 are joined end to end. The copper end is maintained at a potential V1 and the iron end at a lower potential V2. If σ1 and σ2 are the conductivities of copper and iron respectively, then the potential of the junction will be? 

Grade:12

1 Answers

Saurabh Kumar
askIITians Faculty 2400 Points
9 years ago
Here in this question, you write three equations for the potential difference.
Vcopper – Viron= i (Riron + Rcopper) --------(i)
Calculate the value of current from here and put in the lower equation.
Vc – Vjunction = i Rcopper

As we know , R = i/sigma (L/A)
I hope you got the hint, that would help you to find the correct answer.


Good Luck.....................................................................................

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