This page explains Ampere's law related to static current densities, linking the magnetic field →H with current density →J in different geometries. It details calculations for cylindri...This page explains Ampere's law related to static current densities, linking the magnetic field →H with current density →J in different geometries. It details calculations for cylindrical currents and describes the uniform magnetic field between parallel plates with opposing currents. The text emphasizes the role of Maxwell's equations and the Lorentz force law in electromagnetic phenomena, providing simplified models of electric and magnetic fields.