Question

A wire has a resistance of 16ohm it is melted and drwan into a wireof halfits length calculate the resistance ofthenew wire what is rhe percentage change in its resistance

Answer 1

R=ρL/A
so resistance is directly dependent on L
if  L become L/2 then R will also to half

SO new R = 16/2 = 8ohm

% change = 50%

Answer 2

75% is the right answer by shortest one