A wire is 1.0 m long 0.2 mm in diameter has resistance of 10 OMs calculate resistivity
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Length of wire, L = 1 m
Diameter = 0.2 mm
Radius, r = 0.2/2 = 0.1 mm
Resistance, R = 10 ohms
So, resistivity, p = Rπr² / L
p = 10 × 3.14 × (0.1 × 10^–3)² / 1
p = 10 × 3.14 × 0.1 × 10^–6
p = 3.14 × 10^–6 ohm metre
Length of wire, L = 1 m
Diameter = 0.2 mm
Radius, r = 0.2/2 = 0.1 mm
Resistance, R = 10 ohms
So, resistivity, p = Rπr² / L
p = 10 × 3.14 × (0.1 × 10^–3)² / 1
p = 10 × 3.14 × 0.1 × 10^–6
p = 3.14 × 10^–6 ohm metre
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