Longitudinal part of the magnetic field at each point on the sphere direction that marks the green line [image]
![Longitudinal part of the magnetic field at each point on the sphere direction that marks the green line [image]](https://i0.wp.com/www.eurekalert.org/multimedia/pub/web/256906_web.jpg?fit=300%2C300&ssl=1 "Longitudinal part of the magnetic field at each point on the sphere direction that marks the green line [image]")
