A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then…

Physics · Class 12 · CBSEElectrostatic Potential & Capacitance

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?

  1. The charge on the capacitor is not Conserved
  2. The change in energy stored is \(\frac{1}{2} C V^{2}\left(\frac{1}{k}-1\right)\)
  3. The energy stored in the capacitor decreases \(\kappa\) times
  4. The potential difference between the plates decreases \(\kappa\) times

Answer

(A) The charge on the capacitor is not Conserved

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