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Question

Two parallel-plate capacitors of capacitance C and 2C are connected in parallel and charged to potential difference V . The battery is then disconnected and the region between the plates of C is filled completely with a material of dielectric constant K. The common potential difference across the combination becomes

  1. fraction numerator 2 V over denominator K plus 2 end fraction
  2. fraction numerator V over denominator K plus 2 end fraction
  3. fraction numerator 3 V over denominator K plus 3 end fraction
  4. fraction numerator 3 V over denominator K plus 2 end fraction

The correct answer is: fraction numerator 3 V over denominator K plus 2 end fraction

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