Physics, asked by dharanidinagara, 1 year ago

calculate the resistance of 1 km long copper wire of radius 1 mm. (resistivity of copper =1.72 x 10^-8)

Answers

Answered by enormous010
33
Hi friend,

#5.5 ohm
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Solution :- Lenght = 1km = 1000m

Radius = 1mm = 1*10^-3 m

So, Resistivity of copper = 1.72×10^-8

➡Formula :-

➡Resistence = (Resistivity of copper*Lenght) / Area

=> Resistivity of copper*Lenght/22/7 ^2

➡Therefore ,

Resistence = ➡[1.72*10^-8×1000]/[22/7*10^-3]^2

= 5.5ohm ( proved)...i hope it helps you

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Answered by OoINTROVERToO
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

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