How does the resistance of a piece of conducting wire change if both its length and diameter are doubled?

(a) Remains the same

(b) 2 times as much

(c) 4 times as much

(d) 1/2 as much

(e) 1/4 as much

The resistance of a conductor of length L and diameter d is given by R = pL (d/2)2 where p = resistivity of material of conductor. it . pL _ 7:(2d/2)2 When diameter is doubled, the resistance becomes R' = R/4