A variable condenser is permanently connected to a 100 \[V\] battery. If the capacity is changed from \[2\mu \,F\] to \[10\,\mu \,F\], then change in energy is equal to [BHU 2000]

• A.            \[2\times {{10}^{-2}}\,J\]
• B.         \[2.5\times {{10}^{-2}}\,J\]
• C.            \[3.5\times {{10}^{-2}}\,J\]
• D.         \[4\times {{10}^{-2}}\,J\]