Question

A wire of resistance R and length L is compressed to one third of it's original length. New resistance of wire is

Answer 1

Answer:

resistance decrease bi 9 Times

Explanation:

R is directly proportional to (length)²

let R=k(L)²

and R(new)=k(L/3)²

therefore , R(old) /R(new) = 9

that implies R(new)=R(old)/9