Q. Which of the following resistivity ( $\rho$ ) v/s temperature (T) curves is most suitable to be used in wire bound standard resistors?
A) [image:2025J22S1_Q45_opt_a.png]
B) [image:2025J22S1_Q45_opt_b.png]
C) [image:2025J22S1_Q45_opt_c.png]
D) [image:2025J22S1_Q45_opt_d.png]
Explanation
[Solution by Dr. Abubacker] Standard resistors use alloys such as manganin or constantan, whose resistivity is large and almost independent of temperature. That is graph (4), a nearly flat line with a very small slope. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.