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MHT CET202124 Sep 2021Morning ShiftPhysicsCapacitanceActual

If the potential difference across a capacitor is increased from 5 ~V to 15 ~V , then the ratio of final energy to initial energy stored in the capacitor is

Options

  1. A1 : 3
  2. B27 : 1
  3. C3 : 1
  4. D9 : 1

Correct answer

D. 9 : 1

Step-by-step solution

Initial energy W ₁= 1 2 CV ₁^2 Final energy W ₂= 1 2 CV ₂^2 W ₂ ~W ₁ = ( V ₂ ~V ₁ )^2= ( 15 5 )^2=(3)^2=9

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