Question

Write a note on Resistivity

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Answer 1

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⭕⭐RESISTIVITY

》It is defined as the resistance of a conductor of unit length and unit area of cross section.

》Its SI unit is ohm metre.

》The resistivity of a material does not depend on its length of thickness but depends on the nature of the substance and temperature.

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Answer 2

$\huge\underline\green{\sf Resistivity}$

★ Its symbol is $\sf{\rho}$ .

The resistance (R) of a conductor of uniform cross section is directly proportional to its Lenght (L) and inversely proportional to its area of cross section (A)

★$\large{\boxed{\sf R {\alpha} {\frac{l}{A}}}}$

★$\large{\boxed{\sf R ={\rho}{\frac{l}{A}}}}$

Here :-

R = Resistance

$\sf{\rho}$ = Resistivity

A = Area of cross section

When l = 1 , A = 1 , then $\sf{\rho}$ = R

★Thus Resistivity is defined as the resistance of conductor of unit Lenght and unit area of cross section

Unit of Resistivity = ohm.cm

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