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MHT CET202122 Sep 2021Morning ShiftPhysicsCapacitanceActual

When the battery across the plates of a charged condenser is disconnected and a dielectric slab is introduced between its plates then the energy stored

Options

  1. Abecomes infinity
  2. Bdoes not change
  3. Cincreases
  4. Ddecreases

Correct answer

D. decreases

Step-by-step solution

Since the battery is disconnected, the charge on the capacitor remains constant. When the dielectric slab is introduced, the capacitance increases k times. Energy stored, U _ i = q ^2 2 C U _ f = q ^2 2 kC < U _ i

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