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Question 31579
JEE Physics · Hard

Capacitance: Corona Discharge MCQ

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Corona DischargeHardQuestion 31579

Question

Corona discharge occurs when:
  1. A
    Capacitor is fully charged
  2. B
    Electric field exceeds dielectric strength of air (~3 MV/m)
    Correct
  3. C
    Temperature rises above 100°C
  4. D
    Current exceeds 1 A

Correct answer

Electric field exceeds dielectric strength of air (~3 MV/m)

Explanation

At ~3 MV/m, air ionises near sharp points. This limits the voltage on real conductors and is the principle behind lightning rods.

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