Half of the space between parallel plate capacitor is filled with a medium of dielectric constant $K$ parallel to the plates . If initially the capacity is $C$, then the new capacity will be

  • A

    $2KC/(1+K)$

  • B

    $C\, (K+1)/2$

  • C

    $CK/(1+K)$

  • D

    $KC$

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