# Aluminium wire has radius 0.25 mm and length or 75 m. If the resistance of the wire is 10Ω, calculate the resistivity of aluminium.

The formula of resistance is:

Where, resistivity

Length of the conductor

A = Area of the conductor

Here:

R = 10

r = 0.25mm

l = 75m

We know that the area of the wire will be:

Putting the given values in the above formula,

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