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12th Class Physics Electrostatics & Capacitance Question Bank MCQ - Electrostatic Potential and Capacitance

  • question_answer
    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?

    A) The energy stored in the capacitor decreases K times

    B) The change in energy stored is \[1/2C{{V}^{2}}\left( 1/K-1 \right)\]

    C) The charge on the capacitor is not conserved

    D) The potential difference between the plates decreases K times

    Correct Answer: C

    Solution :

    (c) The charge on the capacitor is not conserved


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