A capacitor of capacitance C = 900pF is charged fully by 100V battery B as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance C = 900pF as shown in figure (b). The electrostatic energy stored by the system (b) is:
(1) 2.25 × 10-6 J
(2) 1.5 × 10-6 J
(3) 4.5 × 10-6 J
(4) 3.25 × 10-6 J