If the potential of a capacitor having capacity of $6\,\mu F$ is increased from $10\, V$ to $20\, V$, then increase in its energy will be
  • A$12 \times 10^{-6} \,J$
  • B$9 \times 10^{-4} \,J$
  • C$4 \times 10^{-6} \,J$
  • D$4 \times 10^{-9} \,J$
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