Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004m2 if the resistance is 3.0 \Omega.
A
0.0000267Ωcm
B
0.006Ωcm
C
0.26700Ωcm
D
0.27500Ωcm
E
0.060000Ωcm
Verified Correct Answer: B.
Physical Principles & Numerical Solution
R = \alphaL/A
0.004 cm\(^2\) is equal to 0.00000004 m\(^2\)
P = RA/L = (3 x 0.00000004)/2 = 0.00000006 \Omegacm
Source: Myschool Past Questions Archive (Record #23842)