There are two identical capacitors, the first one is uncharged and filled with a dielectric of constant $K$ while the other one is charged to potential $V$ having air between its plates. If two capacitors are joined end to end, the common potential will be

  • A

    $\frac{V}{K-1}$

  • B

    $\frac{K V}{K+1}$

  • C

    $\frac{K V}{K-1}$

  • D

    $\frac{V}{K+1}$

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