Question

Calculate the area of cross section of a wire of length 1 m, resistance 20Ω and resistivity
1.84x10^-6 Ωm

Answer 1

Answer:

9.2 * 10^-8 m2

The steps are in the attachment

Answer 2

From question,we have;

• Length of wire = 1 m
• Resistance of wire = 20Ω
• Resistivity of wire = 1.84x10^-6 Ωm

We know that, resistance is,

R = p l/A

20 = 1.84x10^-6 × 1/A

20/1.84 × 10^-6 = 1/A

1.84 × 10^-6/20 = A

9.2 × 10^-8 = A

Therefore, the area of cross section is 9.2 × 10^-8 m²

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