Two long coaxical insulated solenoid's `S_1` and `S_2` of equal lengths are would one over the
Channel: Doubtnut
Date: 02/08/2020

Two long coaxical insulated solenoid's `S_1` and `S_2` of equal lengths are would one over the other as shown in figure. A steady current `'T'` flows through the inner solenoid `S_1` to the other end B, which is connected to the outer solenoid `S_2` through which the same current flows in opposite direction so as to come out at end A. If `n_1` and `n_2` are the number of turns per unit length, find the magnitude and direction of net magnetic field at a point (i) inside on the axis and (ii) outside the combined system.  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_XII_V01_C03_S01_458_Q01.png" width="80%"