Solution to task 355 from Chertov´s for extramural stud

Solution to task 355 from Chertov´s for extramural stud

355. Two identical flat air capacitors with a capacity of C = 100 pF each are connected in series into a battery. Determine how much the capacity C of the battery will change if the space between the plates of one of the capacitors is filled with paraffin.