Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm² if the resistance is 3.0 Ω.

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A. 0.0000267Ωcm
B. 0.006Ωcm
C. 0.26700Ωcm
D. 0.27500Ωcm
E. 0.060000Ωcm

Correct Answer:

Option B = 0.006Ωcm

Explanation
R = αL/A
P = RA/L = (3 x 0.004)/2 = 0.006

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