Question

calculate the resistance of 1km long copper wire of radius 1mm . Resistivity of copper is 1.72×10*-8ohm​​

Answer 1

Answer:

5.48

Explanation:

Here, length of the wire, l=1km=1000m

radius of the wire, r=1mm=10−3m, resistivity of cooper, ρ=1.72×10−8Ωm

cross-sectional area of the wire, A=πr2=3.14×(10−3m)2=3.14×10−6m2

If R is the resistance of the given wire, then R=ρlA=(1.72×10−8Ωm)×(1000m)3.14×10−6m2=5.48Ω.

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 × 10-⁷ohm