A constantan wire has a cross sectional area of 4 x 10 -8 m 2
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
- A. 0.4m
- B. 0.8m
- C. 2.5m
- D. 5.0m
Correct Answer: A. 0.4m
Explanation
L = \(\frac{RA}{e} = \frac{11 \times 4 \times 10^{-8}}{1.1 \times 10{-4}} = 0.4m\)
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