Question

A wire of length L has resistance R . what will be the resistance if length of wire becomes 1.5L after stretching?​

Answer 1

Answer:

Explanation:

If the length of wire is doubled the resistance will be

But resistance is also inversely proportional to the area of cross-section, and as area of cross-section is halved due to doubling of length, the resistance is once more doubled due to the halfing of the area of cross-section. So overall the resistance of the wire becomes four times the original resistance.

Answer 2

Answer:

there is a trick to find this ( applicable only when length is increased)

the trick is R'= n²R

R'= 1.5² R = 2.25R ohm

if this trick is useful mark it as brainliest answer