Assuming that the solenoid can be approximated as an infinitely long, tightly wound coil, which are symmetries (or antisymmetries) of this system? antisymmetric under 180° rotations reversing the 2-аxis O symmetric under 180° rotations reversing the Z-аxis symmetric under translations in the z-direction antisymmetric under 180° rotations around the z-аxis symmetric under translations in the r-direction symmetric under rotations around the z-axis
Consider a long solenoid consisting of a coil of wire with radius ?R and ?n turns per unit length. The solenoid carries a current ?I as shown in the figures. Using symmetry and Ampere's law, you will find the magnitude and direction of the magnetic field inside the solenoid. For the purposes of this problem, use a cylindrical coordinate system such that the central axis of the solenoid is in the +?+z‑direction, as shown coming out of the screen in the top illustration. The radial ?r‑coordinate of each point is the distance to the central axis of the solenoid, and the angular ?ϕ‑direction at each point is perpendicular both to the ?z‑direction and to the ?r‑direction as shown.
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