Question

Calculate the resistence of 1 km long copper wire of
radious 1 mm. Resistivity of the
Resistivity of the copper is 1.72×10^-5​

Answer 1

Answer:

Solution:Given: length= 1 km = 1000mradius= 1mm = 1×10^-3mand resistivity = 1.72×10^-8 ohm mArea of cross section = πr² = 3.14×(10^-3)²= 3.14× 10^-6m²Now, resistance = (resistivity×length)/(area of cross section)resistance = (1.72×10^-8×1000)/(3.14×10^-6)resietance = 1.72×10/3.14resistance = 5.478 ohmHence, the resistance of copper wire is 5.478 ohm.

Explanation:

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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