MHT CET 2026 Physics question

A parallel plate air capacitor has capacity 'C' farad, potential 'V' volt and energy 'E' joule. When the gap between the plates is completely filled with dielectric

(A)V increases, E decreases.
(B)V decreases, E increases.
(C)both V and E increase.
(D)both V and E decrease.Correct

Answer: (D)

Solution

The charged capacitor is assumed to be isolated, so its charge remains constant. Filling the gap with a dielectric of constant raises the capacitance to . Then decreases, and the stored energy

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Question ID VK-100834