The insulated spheres of radii ${R_1}$ and ${R_2}$ having charges ${Q_1}$and ${Q_2}$ respectively are connected to each other. There is

  • A

    No change in the energy of the system

  • B

    An increase in the energy of the system

  • C

    Always a decrease in the energy of the system

  • D

    A decrease in the energy of the system unless ${Q_1}{R_2} = {Q_2}{R_1}$

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