Which of the following is a commonly utilized insulator in the utility field?

Fiberglass is a commonly utilized insulator in the utility field because of its excellent electrical insulating properties, lightweight nature, and resistance to corrosion. Fiberglass insulators are used in various applications, including overhead power lines and electrical transmission systems. They can withstand high voltages and are less susceptible to breakage compared to traditional ceramic insulators.

Additionally, fiberglass can be manufactured to provide a high level of electrical resistance, making it ideal for environments where electrical interference might occur, as well as for situations where weather-related stress might affect other materials. Its mechanical strength also contributes to its reliability in support structures for electrical systems, thus ensuring safety and efficiency in energy transmission.