A wire of cross-sectional area 0.60mm2 has a restivity of 7.2 x 10-7 \(\Omega\). Calculate the length of wire that will have a resistance of 3\(\Omega\).
A
0.25m
B
2.50m
C
3.60m
D
36.00
Verified Correct Answer: B.
Physical Principles & Numerical Solution
R = \(\frac{PL}{A}\)
C = \(\frac{RA}{P}\)
C = \(\frac{0.60 \times 10^{-6} \times 3}{7.2 \times 10^{-7}}\)
C = 2.50m
Source: Myschool Past Questions Archive (Record #45553)