for to wires of same lenght and differentradii, does the resistance of wire change?

							The resistance will be different because of radii difference .As the resistance is the difficulty faced in electrons`s flow and it`s inversely proportional to the diameter or radii. The more wider the wire is the less will be the collision of electron with the atoms of the wire so the resistance will also be less.On the contrary, the less wider wire will result in more resistance to the flow of electrons`s.
						

							Resistance is inversely proportional to area ,if radius decreases then resistance increases.R is proportional to length and inversely proportional to area[radius].
						

							
We have, Resistance = Resistivity * (length of wire/area of wire’s cross section)
Area = pi* r2
If we alter the radius of the wire, keeping the wire material and length of the wire unchanged, its resistance will change. Because, resistance of the wire is inversely proportional to its area of cross section or wire radius.
Higher the area of cross section or wire radius lower wil be its resistance and vice-versa...