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Question 31545
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Capacitance: Energy With Dielectric – Battery MCQ

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Energy With Dielectric – BatteryMediumQuestion 31545

Question

When a dielectric (K=2) is inserted between plates of a capacitor connected to a battery (voltage fixed), energy stored:
  1. A
    Doubles
    Correct
  2. B
    Halves
  3. C
    Stays same
  4. D
    Quadruples

Correct answer

Doubles

Explanation

C doubles, V is constant, so U = ½CV² doubles. Battery supplies the extra energy (it also supplies energy that goes to the slab as work).

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