What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter?

What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter? The resistivity of copper is 1.68×10^-8Ω⋅m.

Solutions

Expert Solution

Here length, area of radius of wire and resistivity is given. From radius of wire we can find area of cross section. And then to find resistance we need to apply the farmula that is-

R = ( p • l ) / A

Hence resistance of this wire is R = 3.1649 • 10-⁴ ohm.

Resistance of the given copper wire is 3.16 • 10-⁴ Ω.

Ajay Kumar Gupta answered 3 years ago

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