Question

A wire of length 1 m and radius 0.1 mm has a resistance of 100Ω. Find the resistivity of the material.

Answer 1

Length = 1 m
Area = πr² = 3.14 × 10 ^-8 m
Resistance = 100 ohm

Resistivity = Resistance × Area ÷ length
$resis = \frac{100 \times 3.14 \times {10}^{ - 8} }{1} = 3.14 \times {10}^{ - 6} ohm - m$

Answer 2

Answer: a

Explanation:

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