A constantan wire has a cross sectional area of 4 x 10-8m2 and a resistivity…

Physics WAEC 2005

A constantan wire has a cross sectional area of 4 x 10-8m2 and a resistivity of 1.1 x 10-6\(\Omega\)m. If a resistor of resistance 11\(\Omega\) is to be made from this wire, calculate the length of the wire required

  • 0.4m checkmark
  • 0.8m
  • 2.5m
  • 5.0m

The correct answer is: A

Explanation

L = \(\frac{RA}{e} = \frac{11 \times 4 \times 10^{-8}}{1.1 \times 10{-4}} = 0.4m\)
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