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When does a dielectric become a conductor?

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When does a dielectric become a conductor?

(a) At avalanche breakdown

(b) At high temperature

(c) At dielectric breakdown

(d) In the presence of magnetic field

This question was posed to me during an online interview.

Asked question is from Properties of Dielectric Materials topic in chapter Dielectrics of Engineering Physics II

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Best answer
The correct option is (c) At dielectric breakdown

Best explanation: When a dielectric is placed in an electric field and if the electric field is increased, when the electric field exceeds the critical field, the dielectric loses its insulating property and becomes conducting. This is called dielectric breakdown.

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