A parallel plate air capacitor has a capacitance $C$. When it is half filled with a dielectric of dielectric constant $5$, the percentage increase in the capacitance will be.....$\%$

  • [AIIMS 2009]
  • A

    $400$

  • B

    $66.6$

  • C

    $33.3$

  • D

    $200$

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  • [JEE MAIN 2019]

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