Find the magnitude of the displacement current density in air at a frequency of 18GHz in frequency domain. Take electric field E as 4 units.(a) 18(b) 72(c) 36(d) 4The question was asked in unit test.This interesting question is from Displacement and Conduction Current in chapter Electric Fields in Material Space of Electromagnetic Theory

Find the magnitude of the displacement current density in air at a fre

1.	Find the magnitude of the displacement current density in air at a frequency of 18GHz in frequency domain. Take electric field E as 4 units.(a) 18(b) 72(c) 36(d) 4The question was asked in unit test.This interesting question is from Displacement and Conduction Current in chapter Electric Fields in Material Space of Electromagnetic Theory
Answer» Correct option is (d) 4 The explanation: Jd = dD/dt = εdE/dt in TIME domain. For frequency domain, CONVERT using Fourier TRANSFORM, Jd = εjωE. The magnitude of Jd = εωE = ε(2πf)E. On SUBSTITUTING, we get 4 ampere.

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