A body of capacity $4 \; \mu F$ is charged to $80\;V$ and another body of capacity $6 \; \mu F$ is charged to $30\;V$. When thet are connected the energy lost by $4 \; \mu F$ capacitor is :

Question

( A ) 4.6 mJ
( B ) 2.5 mJ
( C ) 3.2 mJ
( D ) 9.8 mJ