Question

a capacitor of capacitance 10 microfarad is charged to a potential of hundred volt now connecting it in parallel with an uncharged capacitor the resultant potential difference become 40 volt the capacitance of the capacitor is

Answer 1

The energy stored on a capacitor can be calculated from the equivalent expressions: This energy is stored in the electric field. and will have stored energy E = x10^ J. From the definition of voltage as the energy per unit charge, one might expect that the energy stored on this ideal capacitor would be just QV.