Question

calculate the resistance of 1 km long copper wire of radius 1mm resistivity of the copper is 1.72*10-8​

Answer 1

Explanation:

refer attachment

hope it helps

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