what is the resistance of a 12m long wire having radius( 210 to the power - 4) and resistivity (3.1410 to the power - 8)ohmM

1 answer:

3 0

R = ρl/A

Where R = Resistance in Ohms, Ω, ρ = Resistivity in Ωm, l = Length in m.

Area in m²

ρ = Resistivity = 3.14 * 10⁻⁸ Ωm, Length l = 12m,

Area = πr² = π* (2*10⁻⁴)² m² ≈ 3.14 * (2*10⁻⁴)² m²

R = ρl/A

≈ 3.14 * 10⁻⁸ * 12 / (3.14 * (2*10⁻⁴)²)

≈ 3

Resistance, R ≈ 3 Ω

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