Question

a cylindrical wire is stressed to increase it length by 2%. Calculate the percentage to increase in resistance​

Answer 1

⭐《ANSWER》

$\huge\mathfrak{\underline {\underline\pink {ANSWER}}}$

↪Actually welcome to the concept of the CURRENT ELECTRICITY

↪Basically here we are going to use the formula of the Resistance as

↪R = rho * l/A

↪now here , there is increase in the 2 % length , we get as

↪New length ==》 L + 0.02 L = 1.02 L

↪So now here we get as

↪R' = rho * 0.02 l / A .. ( no change is cross sectional Area , as it depends upon the radii factor of the wire )

↪So here we get as

〽R' = 1.02 R