1. The problem statement, all variables and given/known data (See image) 2. Relevant equations C=Q/V 3. The attempt at a solution Part a took a while but I now understand that the electrons gather on the right plate of the 2μF capacitor and on the right plate of the 4μF capacitor. This imparts a negative charge of 133μC on each capacitor. Part b is where I cannot justify the answer. The charge should flow to equalise the pd's, that's All I know. Part c is fine.