Assume two parallel conducting plates perpendicular to the z axis of Cartesian system. They are separated by “d”. The coordinate center is at the center of the plate system. Each plate is large with and edge length of L. The upper plate has a surface charge density of – sigma and the lower has + sigma. Between the plates oriented along the x axis there is a constant magnetic field B0. What is the angular field momentum density between the plates and the total angular momentum? If the B0 field suddenly goes to zero, is the field momentum conserved?

Assume two parallel conducting plates perpendicular to the z axis of Cartesian system. They are separated by “d”. The coordinate center is at the center of the plate system. Each plate is large with and edge length of L. The upper plate has a surface charge density of – sigma and the lower has + sigma. Between the plates oriented along the x axis there is a constant magnetic field B0. What is the angular field momentum density between the plates and the total angular momentum? If the B0 field suddenly goes to zero, is the field momentum conserved?