Question

Calculate the resistance of 1 kilometre long copper wire of radius 1 mm. Resistivity of copper is 1.72 X10 power -8 *

Answer 1

Explanation:

not sure though...process is right calculation might go wrong.

Answer 2

GIVEN THAT

• Length of copper wire = 1 km = 1000 m
• Radius of copper wire = 1 mm = 1 × 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*1000]/[22/7×(1×10⁻³)²]
• 5.5 ohm