Water
Oil
Air
SF6
Answer is Wrong!
Answer is Right!
The correct answer is D. SF6.
SF6 (sulfur hexafluoride) is a gas that is used as an insulating medium in high-voltage equipment. It is non-flammable, non-toxic, and has a very high dielectric strength. This makes it ideal for use in circuit breakers, which need to be able to interrupt high currents without arcing.
Water is a good conductor of electricity, so it is not suitable
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