NEET2015Physics-Electrostatics
NEET 2015 Physics Capacitors and Dielectrics MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A parallel plate 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 potential difference between the plates decreases k times.
B
The energy stored in the capacitor decreases k times.
C
The change in energy stored is 1/2 CV² (k - 1).
D
The charge on the capacitor is not conserved.
Correct Answer
Option C
Detailed Explanation
When the capacitor is disconnected, the charge remains constant. The potential difference and energy change due to the dielectric, but the charge is conserved.
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