Four condensers each of capacity 4μF are connected as shown in figure. VP-VQ=15volts . The energy stored in the system is [CPMT 1976, 89]
2400ergs
1800ergs
3600ergs
5400ergs
Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current ampere as shown in figure, the potential difference VP−VQ is