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12th Class Physics Electrostatics & Capacitance Question Bank Case Based (MCQs) - Electrostatic Potential and Capacitance

  • question_answer
    A parallel plate air capacitor has capacity C farad, potential V volt and energy E joule. When the gap between the plates is completely filled with dielectric:

    A) Both V and E increase    

    B) Both V and E decrease

    C) V decreases, F increases  

    D) V increases, £ decreases

    Correct Answer: B

    Solution :

    (b) Both V and E decrease When the gap between the plates is completely filled with dielectric of dielectric constant K, then potential is             \[V=\frac{Qd}{A{{\varepsilon }_{0}}K}\]                                                                                                                                   … (1) And electric field is \[E=\frac{Q}{A{{\varepsilon }_{0}}K}\]                                                                                                                         … (2) From eqs. (1) and (2), both electric field and potential decrease.


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