किस समान लम्बाई तथा \(2\) मिलीमीटर व्यास के एक लोहे के तार तथा एक ताँबा-निकिल मिश्रधातु के तार को समान्तर में जोडने पर \(3\) ओम का तुल्य प्रतिरोध प्राप्त होता है ? (\(m\) में) (दिया है लोहे तथा ताँबा-निकिल मिश्रधातु की प्रतिरोधकता क्रमशः \(12\, \mu \Omega \,cm\) तथा \(51\, \mu \Omega \,cm\) है)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.