Question

Calculate the resistance of 100m long copper wire. The area of cross- section of the
wire is 1m
^2 take resistivity ( f ) of copper =1.7x10-8 m.​

Answer 1

Explanation:

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Answer 2

ANSWER:

8.5 × 10^(-3) Ω

STEP BY STEP SOLUTION:

RESISTANCE (R) = RESISTIVITY (rho) × LENGTH (L) / AREA OF CROSS SECTION (A)

R = rho × L / A

GIVEN:

THERE IS A COPPER WIRE

ITS LENGTH = 1 m

AREA OF CROSS SECTION = 2 mm² = 2 × 10^(-6) m²

RESISTIVITY = 1.7 × 10^(-8) Ωm

HENCE THE REQUIRED RESISTANCE OF THE COPPER WIRE

= 1.7 × 10^(-8) Ωm × 1 m / 2 × 10^(-6) m²

= 0.85 × 10^(-2) Ωm²/m²

= 8.5 × 10^(-3) Ω

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