Physics WAEC

A constantan wire has a cross-sectional area of 4 x 10-8m2 and a resistivity of 1.1 x 10-6Ωm. If a resistor of resistance 11Ω 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: Option A

Explanation

L = RA/e=(11×4×10^−8)/(1.1×10^−4)

=0.4m

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