The plates of a parallel plate capacitor of capacity \[50\mu C\] are charged to a potential of \[100\ volts\] and then separated from each other so that the distance between them is doubled. How much is the energy spent in doing so [MP PET 1997; JIPMER 2000]

• A. \[25\times {{10}^{-2}}J\] 
• B.   \[-12.5\times {{10}^{-2}}J\]
• C. \[-25\times {{10}^{-2}}J\]       
• D.   \[12.5\times {{10}^{-2}}J\]