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QAIPM-2015-Ph-1326: NEET 2015 Physics - Class 12 AIPM-2015-Ph-1326 Solution: A parallel plate air capacitor of capacitance C is connected to …

A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K which can just fill the air gap of the capacitor is now inserted in it. Which of the following is incorrect? The change in energy stored is 12CV2(1K−1)\frac{1}{2}CV^2(\frac{1}{K}-1) The charge on the capacitor is not conserved. The potential difference between the plates decreases K times. The energy stored in the capacitor decreases K times.

Multiple Choice Options

  • A The change in energy stored is 12CV2(1K−1){1 \over 2}C{V^2}\left( {{1 \over K} - 1} \right) 2 1 _ C V 2 ( K 1 _ _ 1 )
  • B The charge on the capacitor is not conserved.
  • C The potential difference between the plates decreases K times.
  • D The energy stored in the capaciotor decreases K times.

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