What is the advantage of using thick metallic strips to join wires in a potentiometer ?

Explanation

In potentiometer instead of using a very long wire, wire of different length are connected by using thin metal strip such that necessary equivalent length is obtained. Resistance of these metal strip is very small and can be neglected. There is no need to calculate length of strips.
In experiment instead of using one long wire, different wire of l m length are joined together to obtain necessary length of potentiometer.
In potentiometer centimeter scale or meter scale are used hence null point can be accurately obtained.