“There is a wire whose resistance is R. it is streched, and its length gets increased to 2%. find new resistance.” – Knishka Agrawal asked Answer: The resistivity does not change due to stretching, but the length and area of cross section changes; but the volume remains constant. Therefore, resistance changes which can be calculated **...Read the full post**

# If a Cu wire is stretched to make it 0.1% longer , the %age change in its resistance is ?

When stretched, the volume remains constant. So, A1l1=A2l2 Original resistance R1= rl1/A1 Final Resistance R2= rl2/A2 Percentage change in resistance = (R2-R1)x100/(R1) Substitute the values and try to get the answer