A parallel plate capacitor with air between the plate has a capacitance of $15 pF$. The separation between the plate becomes twice and the space between them is filled with a medium of dielectric constant $3.5.$ Then the capacitance becomes $\frac{ x }{4}\,pF$.The value of $x$ is $............$

  • [JEE MAIN 2023]
  • A

    $10.5$

  • B

    $1.05$

  • C

    $105$

  • D

    $108$

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  • [JEE MAIN 2023]

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