[poll id=”27″]
ANSWER: C – 1/3
The resistance formula is R = p(L/A) ; where p=resistivity, L=length and r=radius.
Tripling the length gives 3L, whereas tripling the radius would make the area 9x as big (A=2pi*r^2). Thus, you would end up with a ratio of 3/9, which is 1/3 the resistance of the new wire.