Find potential of A and B in the given figure. (pardon poor quality, I only have a webcam)
The Attempt at a Solution
marking 1 to 4 from left to right. C1,C2,C3 are in series. C123=(2/3)C. which is in parallel with C4. C effective is 5C/3. What now? I don't know what to make of the point between them (lets call it D) being earthed.