Question

define law of resistivity​

Answer 1

Answer:

The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: ... Whether or not a material obeys Ohm's law, its resistance can be described in terms of its bulk resistivity

Answer 2

$resistivity \: \: p \times \frac{a}{l}$

it is directly proportional to rho and area and inversely proportional to length