Presentation Information
[16a-M_135-8]Frequency Dependence of the Displacement Current Density Between Capacitor Plates
〇Toshio Hyodo1 (1.KEK-IMSS)
Keywords:
displacement current density,capacitor,electromagnetic wave
When an alternating current with angular frequency ω flows through a parallel plate capacitor, displacement current density (ε0 × time derivative of the electric field) is generated between the region between the plates. The frequency dependence of the amplitudes of its Coulombic electric field component JC and induced electric field component JI is investigated. While the amplitude of JC remails constant for any value of ω, the amplitude of JI is extremely small at low frequencies, increases proportionally with ω², and becomes comparable to that of JC for sufficiently high frequencies. This finding helps resolve misunderstandings regarding the relationship between the displacement current density between the plates, the magnetic field there, and electromagnetic waves.