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` 10^(-3) " मीटर"^(2)` अनुप्रस्थ परिच्छेद वाले एक तार का प्रतिरोध `2 Omega ` तथा विशिष्ट प्रतिरोध ` 1.70 xx10^(-4) .^(@)C^(-1)` ओम मीटर है । तार कि लम्बाई ज्ञात कीजिए ।

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सूत्र `R = (rhol)/(A) ` से `R = (rhol)/A` से ` l = (RA)/(rho)`
दिया है A = `10^(-3) " मीटर"^(2)` R = 2 ओम
तथा ` rho = 1.6 xx 10^(-8) ` ओम - मीटर
सूत्र में मान रखने पर ,
`l = (2xx10^(-3))/(1.6xx10^(-8))= 1.25xx 10^(5)`

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