Physics, asked by ashutoshjha10, 1 year ago

what length of a copperof cross sectional are 0.01mm ^2 would be repired to obtain a resistance of 1K ohm?resistivity of copper 1.7x10^-8Ohm m​

Answers

Answered by Anonymous
0

Answer:

Explanation:

Length of a copper cross sectional = 0.01mm² (Given)

Resistivity = 1.7 x 10⁻⁸ (Given)

Resistance of a wire is given as = R = ρL/A

where,

ρ is the resistivity, L is the length and A is the area

Area = πr²

= π(0.05 x 10⁻³)²

= 25π x 10⁻¹⁰ m²

Given R = 1

= ρL/A = 1

= (1.7 x 10⁻⁸ x L)/25π x 10⁻¹⁰ = 1

= L = 1 x 25π x 10⁻²/1.7

= L = 1.4π = 4.4 meters

Hence the length of the wire should be 4.4 meters

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