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Q.

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?

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a

The energy stored in the capacitor decreases K times.

b

The change in energy stored is 12CV21K−1

c

The charge on the capacitor is not conserved.

d

The potential difference between the plates decreases K times.

answer is C.

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