The resistances of an iron wire and a copper wire at

Question:

The resistances of an iron wire and a copper wire at $20^{\circ} \mathrm{C}$ are $3.9 \Omega$ and $4.1 \Omega$ respectively. At what temperature will the resistances be equal? Temperature coefficient of resistivity for iron is $5.0 \times 10^{-3} \mathrm{~K}^{-1}$ and for copper it is $4.0 \times 10^{-3} \mathrm{~K}^{-1}$. Neglect any thermal expansion.

Solution:

Leave a comment

Close

Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now