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JEE MAIN 2021
26.0821_S1
Question
What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of $3 \Omega$ ? (Given resistivities of iron and copper-nickel alloy wire are $12 \mu \Omega \mathrm{~cm}$ and $51 \mu \Omega \mathrm{~cm}$ respectively)
Select the correct option:
A
82 m
B
97 m
C
110 m
D
90 m
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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