One metallic sphere $A$ is given a positive charge,whereas another identical metallic sphere $B$ of exactly the same mass as $A$ is given an equal amount of negative charge. Then:

  • A
    Mass of $A$ and mass of $B$ still remain equal.
  • B
    Mass of $A$ increases.
  • C
    Mass of $B$ decreases.
  • D
    Mass of $B$ increases.

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