Question

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 change in energy stored is

B

The charge on the capacitor is not conserved

C

The potential difference between the plates decreases K times

D

The energy stored in the capacitor decreases K times

Hard
NEET

Solution

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Correct option is B)





After the capacitor is disconnected from the battery, charge on the capacitor cannot change.


since as given

Option(A) is correct.

Option (B) :
Charge on the capacitor remains same since battery is disconnected.

Option (C):
C increases K times.
Since and Q remains same, V decreases K times.

Option D:
The energy stored in the capacitor decreases K times.






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