Q. When the number of turns and the length of the solenoid are doubled keeping the area of cross-section same, the inductance
A) Remains the same
B) Is halved
C) Is doubled
D) Becomes four times
Explanation
(c) $L = \mu_{0}\frac{N^{2}}{l}A$. When $N$ and $l$ are doubled $L$ is also doubled
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.