Question

define resistivity. write its dimensional formula ​

Answer 1

Answer:

The dimensional formula for resistivity is [ML^3T^(-3)A(-2). Where ; R is resistance, ρ is resistivity , l is the length of the conductor , A is the cross sectional area of the conductor.

Answer 2

Answer:

Resistivity is defined as the resistance offered by a wire of that material of unit length and unit cross-sectional area. Electric current is defined as the rate of flow of electric charge through a conductor

Resistance = \rhoρ l/A

so, resistivity (\rhoρ ) = RA/L

Resistance (R) = V/I

V = Work done /charge

So, Resistance = Work done/charge /Current

= [ML²T-²]/[TA]/[A]

= [ML²T-³A-²]

Resistivity = Resistance