Archive
9th of September 2015
Physics
Q:

define resistivity

Shriya Natta - CBSE - Class X

Wednesday, September 09, 2015 at 18:48:PM

A:

Hi Shriya,

The resistance of a conductor is directly proportional to its length (l) and inversely proportional to its area of cross section (A).

begin mathsize 12px style straight R space proportional to space straight I divided by straight A straight R space equals space ρI divided by straight A end style

where is Ρ constant of proportionality called specific resistance or resistivity of the material of the conductor.

The S.I. unit of resistivity is ohm metre (m).

Wednesday, September 09, 2015 at 18:54:PM