What happens to the resistance as the conductor is made thicker?

As the thickness of the conductor is increased, the resistance of the conductor decreases. This is because: R = (ρl)/(A)

Where,

R is the resistance

l is the length of the conductor

A is the area of cross section of the conductor And ρ is the resistivity

Since, area is directly proportional to the radius of the wire, increase in cross-sectional area or the thickness will result in decrease in resistance and current flow will be more.