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Question 31540
JEE Physics · Medium

Capacitance: Capacitance from Energy MCQ

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Capacitance from EnergyMediumQuestion 31540

Question

A capacitor stores 18 mJ at 6 V. Its capacitance is:
  1. A
    1 mF
    Correct
  2. B
    6 mF
  3. C
    1 μF
  4. D
    3 mF

Correct answer

1 mF

Explanation

U = ½CV² → C = 2U/V² = 2×18×10⁻³/36 = 1×10⁻³ F = 1 mF.

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