Question

what is resistivity?write its mathmatical formula?​

Answer 1

the resistivity of a metal is defined as the resistance per unit length of a material of unit area of cross section. And formula is R =rho l /a

Answer 2

Resitivity is a constant of proportionality.The S.I unit of resistivity is ohm metre. It is a characteristic property of the material.

The Conductors have very low resitivity whereas Insulators have high resistivity.It is denoted by p that is rho.
R=rho(p)l/A

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