Question

In the four regions, I, II, III and IV, the electric fields are described as : Region I : Eₓ = E₀ sin (kz – ωt) Region II : Eₓ = E₀ Region III : Eₓ = E₀ sin kz Region IV : Eₓ = E₀ cos kz The displacement current will exist in the region :

Explain the following, giving proper reason : (a) During charging of a capacitor, displacement current exists in the capacitor. But there is no displacement current when it gets fully charged. (b) The frequency of microwaves in ovens matches with the resonant frequency of water molecules. (c) Infrared waves are also known as heat waves.