A $6\,\mu F$ capacitor is charged from $10\;volts$ to $20\;volts$. Increase in energy will be
  • A$18 \times {10^{ - 4}}\,J$
  • B$9 \times {10^{ - 4}}\,J$
  • C$4.5 \times {10^{ - 4}}\,J$
  • D$9 \times {10^{ - 6}}\,J$
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