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Capacitor question

2015 · Q115
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Capacitor question

2015 · Q115

NEETPhysicsCapacitorMCQ+4 / −1
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 dieletric constant K, which can just fill the air gap of the capacitor, is now inserted in it . Which of the following is incorrect ?
  1. A
    The change in energy stored is 12CV2(1K−1){1 \over 2}C{V^2}\left( {{1 \over K} - 1} \right)21​CV2(K1​−1)
  2. B
    The charge on the capacitor is not conserved.
  3. C
    The potential difference between the plates decreases K times.
  4. D
    The energy stored in the capaciotor decreases K times.
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