An uncharged parallel plate capacitor having a dielectric of constant $K$ is connected to a similar air-cored parallel capacitor charged to a potential $V$. The two share the charge and the common potential is $V'$. The dielectric constant $K$ is
An uncharged parallel plate capacitor having a dielectric of constant $K$ is connected to a similar air-cored parallel capacitor charged to a potential $V$. The two share the charge and the common potential is $V'$. The dielectric constant $K$ is
- A
$\frac{{V' - V}}{{V' + V}}$
- B
$\frac{{V' - V}}{{V'}}$
- C
$\frac{{V' - V}}{{V}}$
- D
$\frac{{V - V'}}{{V'}}$
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