Question

How does the resistance of a wire change when:
(1) Its length is tripled?
(2) Its diameter is tripled?
(3) Its material is changed to one whose resistivity is three times?

Answer 1

resistance becames 3 times if length tripled.
resistance became  4/9 times if diameter is tripled.
resistance became same if resistivity change...

Answer 2

resistance becames 3 times if length tripled.
resistance became  4/9 times if diameter is tripled.
resistance became same if resistivity change.