A capacitor of capacitance $C =900\,pF$ is charged fully by $100\,V$ battery $B$ as shown in figure $(a)$. Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance $C =900\,pF$ as shown in figure $(b)$. The electrostatic energy stored by the system $(b)$ is $\dots\dots\times 10^{-6}\,J$
NEET 2022, Medium
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