(a) State Ampere\'s circuital law, expressing it in the integral form. (b) Two long coaxial inlsulat
Channel: Doubtnut
Date: 2020-01-19

(a) State Ampere\'s circuital law, expressing it in the integral form. (b) Two long coaxial inlsulated soenoids, `S_(1)` and `S_(2)` of equal lengths are would one over the other as shown in the figure. A steady current \'\'I\'\' 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 \'\'I\'\' flows in the opposite direction so as the 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 the net magnetic field at a point (i) inside on the axis and (ii) outside the combined system.