Q. If an increase in length of copper wire is 0.5% due to stretching, the percentage increase in its resistance will be
A) 0.1%
B) 0.2%
C) 1%
D) 2%
Explanation
(c) Approximate change in resistance=$2 \times \%$ change in length by stretching
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.