An uncharged parallel plate capacitor having 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) V' - V/V' +V  
(b) V' - V/V
(c) V' - V/ V'
(d) V - V'/V'

I got d as answer

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