A little circuit reduction question

[inquel112]

Homework Statement

The attached file has a circuit reduction which I can understand all but the missing capacitance C between B' and C' to the ground each from figure (a) in figure (b)

Homework Equations

N/A

The Attempt at a Solution

Shouldn't there be another capacitance of 2C in the bottom line of figure (b)?

 

[gneill]

Looks like the voltage sources have been suppressed (Thevenin?). Thus B' and C' both are grounded through the shorted supplies. Both ends of those two caps are thus grounded... and they disappear in a puff of logic

 

[inquel112]

oh wow. i feel a little embarrassed now but never thought i would make that out in my head. thanks so much!

 

[gneill]

No problem. Glad to help.