In a few questions, I have some confusion on how to take the resultant capacitance(Of a parallel plate capacitor) with a combination of dielectric in between.
Here is a an example
k1,k2,k3 represent the dielectric constants of the dielectric slabs. A is the plate area, d the distance between the plates.I know that we could split it into equivalent capacitors and from there it is easy to find the resultant capacitance.
But I am confused on how to split them. I have 2 possible approaches
(k1,k2,k3 represent the dielectric constants of the dielectric slabs. A is the plate area, d the distance between the plates)
The 2nd part makes more sense to me and it also turn out to be the right method. However I cannot understand why the 1st part shouldn't work out.
Here is another example:
Even here I could split it in 2 ways-
Here (i) is the correct way but (ii) isn't. I do not understand how either could be wrong or right.
Would really help if someone could point out what I am missing out.
(p.s: The spaces between the dielectrics that I have left in my solution are just to illustrate how I split the system. They indicate no real spaces.)