"The resistance of a wire is directly proportional to its length and inversely proportional to the
Channel: Doubtnut
Date: 2020-04-05

"The resistance of a wire is directly proportional to its length and inversely proportional to the square of its radius. Two wire of the same material l have the same resistance and their radii are in the ratio of 9:8. If the length of the first ire is 162 cm, find the length of the other wire."