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The specific resistance of a wire is ρ, its volume is 3m3 and its resistance is 3 ohm,what will be its length?




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Resistance R = ρ L / A , 

       we have Volume V = A L     => A = V / L
      ρ = A R / L = V R / L²

     L² = V R / ρ =  3 * 3 / ρ

          L = 3 / √ρ  meters.

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