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

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

A 0.0000267Î©cm
B 0.006Î©cm
C 0.26700Î©cm
D 0.27500Î©cm
E 0.060000Î©cm

waec 1988 physics

The correct answer is B. 0.006Î©cm

R = Î±L/A

P = RA/L = (3 x 0.004)/2 = 0.006

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