What does dielectric strength indicate about an insulating material?

Dielectric strength is a critical property of insulating materials as it indicates the maximum electric field that the material can withstand before experiencing dielectric breakdown. When a material reaches its dielectric strength, it can no longer act as an effective insulator, often resulting in a breakdown that allows current to flow through the material, which can lead to potential failure in electrical systems. This property is important for ensuring safety and reliability in electrical applications.

The correct response focuses on the relationship between the material's capacity to resist electric fields and its performance as an insulator. Understanding dielectric strength helps engineers select appropriate materials for various applications, ensuring they can handle the expected electrical stresses without failing.