Four conducting lobes (2) of area S each are glued to the non-conducting disk (1). When the disk rotates, the lobes alternately enter the gap between the shielding plates (3), while touching the sliding grounded contacts (4). The contact is interrupted when the lobe leaves the plates. The lobe then touches the electrode (5) connected to the capacitor of capacitance C. After the contact with the electrode is interrupted, the lobe enters the gap of the second pair of plates, etc. How many times will the voltage across the capacitor increase after n turns of the disk? The gap between the petal and the shielding plates d is small compared to the petal dimensions.