Question

The resistance of a Cu wire 200meter long is 21omega if its thickness is 0.44mm calculate its specific resistance in ohm meter

Answer 1

Answer: 0.0462ohm-meter IS THE ANSWER

Explanation:

GIVEN, R=21 ohm

          A=0.44mm²=0.44×10⁻⁶m²

           l=200m

        R=ρl/A

HERE ρ=SPECIFIC RESISTANCE

         l=LENGTH OF THE WIRE

         A=THICKNESS OF AREA

==>21=ρ×200/0.44×10⁻⁶==>ρ=21×0.44×10⁻⁶/200=0.0462ohm-meter

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