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# A $5 \mu F$ capacitor is charged by a $100 V$ supply. It is then disconnected from the supply and is connected to another uncharged $3 \mu F$ capacitor. How much electrostatic energy of the first capacitor is lost, in the form of heat and electromagnetic radiation, in the process of attaining the steady situation?

$0.9 \times 10^{-2} J$
Hence A is the correct answer.