Question

calculate the resistance of 2 km long copper wire of radius 2 mm. (Resistivity of copper is 1.72×10^(-8))

Answer 1

Pls verify one time, my calculations could be wrong. I hope it was helpful

Answer 2

GIVEN THAT

• Length of copper wire = 2 km = 2000 m
• Radius of copper wire = 2 mm = 2 × 10-³ m
• Resistivity of copper = 1.72 x 10⁻⁸

CALCULATION OF RESISTANCE

• (Resistivity of copper × Length)/(Area)
• (Resistivity of copper × Length)/(πr²)
• [1.72×10⁻⁸*2000]/[3.14×(2×10⁻³)²]
• 2.7 ohm