A wire of cross-sectional area 2π *  10\(^-{8}\) m\(2\) and resistivity 1.1 x 10\(^-{8}\) Ω m, has a…

Physics WAEC 2021

A wire of cross-sectional area 2π *  10\(^-{8}\) m\(2\) and resistivity 1.1 x 10\(^-{8}\) Ω m, has a resistance of 21Ω.

Calculate the length of the wire. [π=22/7]     

  • 180 m
  • 140 m
  • 120 m checkmark
  • 240 m

The correct answer is: C

Explanation

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