Discussion on the Boundary Relation of Electromagnetic Rield
The boundary relation of electromagnetic field is comprehensively analyzed.The normal component of dielectric displacement vector and parallel component of magnetic field are discontinuous across the interface due to the free surface charge and the free surface current.Bound surface charge and bound surface magnetized current give rise to the discontinuous normal component of intensity of polarization and the parallel component of intensity of magnetization across the interface.The boundray relations are independent with each other in the case of the steady electromegnetic field;however,they are dependent in the case of the time-dependent electromagnetic field,where only the tangential component of boundary relations needs to be considered.