Discussion
The electrical breakdown strength of insulating materials depends on:
Answer: D
Breakdown strength depends on All of the above.
The breakdown strength of an insulating material is not a fixed number. It depends on the nature of the applied voltage (DC, AC or impulse, and how long it is applied), on imperfections such as voids, cracks and impurities where local discharges start, and on the environment: pressure, temperature and humidity all change it, the last especially for gases and surfaces.
Each of the first three options names a genuine factor, so none alone is the full answer.
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