Question

calculate the resistance of 1km long copper wire of radius 1mm .resistivity of the copper is 1.72 x 10-3ohm metre​

Answer 1

Answer:

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Answer 2

Answer:

.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

Explanation:

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