Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the resistance is 3.0 Ω.
-
A.
0.0000267Ωcm -
B.
0.006Ωcm -
C.
0.26700Ωcm -
D.
0.27500Ωcm -
E.
0.060000Ωcm
Correct Answer: Option B
Explanation
R = αL/A
P = RA/L = (3 x 0.004)/2 = 0.006