A wire of length 1 m and radius 0.1 m has a resistance of 100 ohm . find the resistivity of the material solution.

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A wire of length 1 m and radius 0.1 m has a resistance of 100 ohm . find the resistivity of the material solution.

sd0936110 11th Jun, 2021

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Answer (1)

Arshiya 11th Jun, 2021

Hello

Formula for resistivity (p) is:

p = (R×A)/l

where R = resistance of the material

A = cross sectional area ( pi × r^2 )

l = length of the wire

so, p = ( 100 × (22/7) × 0.1 × 0.1) / 1

= 22/7 or 3.14 ohm-m

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