Since where i live it is raining like crazy, my family and i make a fire in the fire place. so i place the wood in the fire and it starts to pop like crazy. why is the wood popping?

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.