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The parallel combination of two air filled parallel plate capacitors of capacitance C and nC is connected to a battery of voltage, V. When the capacitors are fully charged, the battery is removed and after that a dielectric material of dielectric constant K is placed between the two plates of the first capacitor. The new potential difference of the combined system is :

1. n K V +
2. n K nV +
3. ) n K ( V ) 1 n ( + +
4. V

Correct answer: ) n K ( V ) 1 n ( + +

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