Question

Calculate the resistance of 50 cm length of wire of cross sectional area 0.01 square mm

and of resistivity 5 × 10-8 Ω m​

Answer 1

To calculate the resistance of a wire, you can use the formula:

Resistance (Ω) = Resistivity (Ω·m) × Length (m) / Cross-sectional area (m²)

In this case, the resistivity is 5 × 10-8 Ω m, the length is 50 cm = 0.50 m, and the cross-sectional area is 0.01 square mm = 0.01 × 10-6 m². Plugging these values into the formula, we get:

Resistance (Ω) = 5 × 10-8 Ω m × 0.50 m / 0.01 × 10-6 m²

= 0.25 Ω

So the resistance of the wire is 0.25 Ω.