The distance between the plates of a flat air capacitor connected to a voltage source with an emf of 180 V is 5 mm. The area of the capacitor plates is 175 cm2. Find the job of moving the plates apart to a distance of 12 mm in two cases: 1) the capacitor is disconnected from the source before moving the plates apart; 2) the capacitor is constantly connected to the source during the process of moving the plates apart.
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