Question

Two coppre wire of same length but one is thicker than other tgen which wir will have more resistance

Answer 1

First of all 
Specific resistance the inherent property of a material… It is defined as “ the resistance offered per unit length and unit cross sectional area of that material when a known quantity of voltage is applied at its end”.
It depends on its material and temperature.

Mathematical equation for specific resistance is as follows:

p=(RA)/L

Where,

p is Specific resistance/ resistivity

R is Resistance

A is cross sectional area of the material

L is length of the material

Now coming to the question Both the copper wire will have same specific resistance insipte of difference in their diameters.
As due to difference in diameter their resistance will also change but the value of R*A will remain constant for both the wire