Question

define the specific resistance and derive the relation for it​

Answer 1

A measure of the potential electrical resistance of a conductive material. It is determined experimentally using the equation ρ = RA/l, where R is the measured resistance of some length of the material, A is its cross-sectional area (which must be uniform), and l is its length. It is measured in ohm-meters...

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Answer 2

Specific resistance is defined as the resistance of a conductor of unit length and unit area of cross-section.

DERIVATION:

R ∝ l

R ∝ 1/A

⇒R = ρl/A   (where 'ρ' is a constant known as 'resisitivity' or 'specific resistance'.)