AN EXAMPLE OF SURFACE-CHARGE DISTRIBUTION ON CONDUCTORS CARRYING STEADY CURRENTS

In order to constrain electrons to move along ohmic conductors carrying steady currents, there must be a surface charge density that is usually very difficult to calculate. An approximate analytic expression for this surface charge density on a conducting square ring is presented here where the only source of emf is a changing external magnetic field. The corresponding electric field is determined and it is checked that the energy balance for this system holds.