एक 2 A धारावाही सीधा धात्विक तार जिसका प्रतिरोध \(1 \Omega\), प्रतिरोधकता \(2 \times 10^{-6} \Omega m\), अनुप्रस्थ काट का क्षेत्रफल \(10 mm^2\) और द्रव्यमान 500 g है, को एकसमान चुंबकीय क्षेत्र \(\vec{B}\) लगाकर क्षैतिज रूप से हवा में निलंबित किया गया है। \(B\) का परिमाण _______ \(\times 10^{-1} T\) है (दिया गया है, \(g =10 m / s ^2\) )।

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.