The resistance of a 5m uniform wire of cross-sectional ar...
The resistance of a 5m uniform wire of cross-sectional area 0.2 x 10-6m2 is 0.425. What is the resistivity of the material of the wire?
1.10 x 10-6Ωm
4.25 x 10-6Ωm
2.40 x 10-7Ωm
1.70 x 10-8Ωm
Correct answer is D
Resistance = Resistivity x AreaArea
= 0.425 x 0.2 x 10-6
= 1.7 x 10-8Ωm