state gov BSSC Laboratory Assistant Mock Test Series 2025 Physics Capacitance Capacitor with a Dielectric
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 energy stored in the capacitor decreases K times.
2
The chance in energy stored is \(\frac{1}{2} C V^{2}\left(\frac{1}{K}-1\right)\).
3
The charge on the capacitor is not conserved.
4
The potential difference between the plates decreases K times.