Question

Calculate the resistance of 1 km long copper wire of radius 1 mm. Resistivity of the copper is 1.72 × 10–8 ω m.

Answer 1

Answer:

The resistance of 1 km long copper wire of radius 1 mm.

Resistivity of the copper is 1.72 × 10–8 ω m.

Originally Answered: If radius of a wire is doubled then what happens to its resistance.

So by doubling the radius of wire , the resistance of the wire will become 1/4 time the previous resistance.

Answer 2

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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