Hi, suppose there are two parallel plates, say, of PEC material, and the material between them is air. Now, the E-field calculated is just from the formula E=V/d, where V is the potential difference between the plates and d is the distance between the plates. With this, if we include some conductors in between the parallel plates, the E-field gets intensified. Why? ( I seem to think because of surface charge density but I'm not sure of it).
Secondly, with the presence of these conductors between the parallel plates, if we provide DC excitation to the plates (say 1MV to the top plate and 0V to the bottom plate), the field near the top surface of the conductor placed near the top positive plate is observed to be higher than the field near the bottom conductor nearer to the ground plate. Now, if we change the excitation to an AC time-varying signal, the situation reverses, i.e., the field strength is seen to be more near the bottom conductor(nearer to the ground plate), and it is observed to be less near the top conductor(nearer to the top positive plate).
Can anyone help me with this? I have been studying the effect of time-varying excitation on E-field but can't seem to understand it precisely. An analytical answer with some typical practical values (maybe mathematical analysis with formulas) is much appreciated. Thanks.
