A wire of cross-sectional area 0 60mm2 has a re... - WAEC Physics 2015 Question
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
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Correct Option: B
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
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