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

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

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Correct Answer: Option A

Explanation

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

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

Correct Answer: Option A

Explanation

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