A wire of cross-sectional area 0.60mm2 has a restivity of 7.2 x 10-7 \(\Omega\). Calculate...

WAEC 2015

A wire of cross-sectional area 0.60mm² has a restivity of 7.2 x 10^-7 \(\Omega\). Calculate the length of wire that will have a resistance of 3\(\Omega\).

A. 0.25m
B. 2.50m
C. 3.60m
D. 36.00

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Correct Answer: Option B

Explanation

R = \(\frac{PL}{A}\)

C = \(\frac{RA}{P}\)

C = \(\frac{0.60 \times 10^{-6} \times 3}{7.2 \times 10^{-7}}\)

C = 2.50m

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A wire of cross-sectional area 0.60mm2 has a restivity of 7.2 x 10-7 \(\Omega\). Calculate...

Correct Answer: Option B

Explanation

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