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
Correct Answer: Option B
Explanation
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