Dielectric strength is an important property of insulating materials. Which of the following best describes the dielectric strength of a material?

The Correct Answer is 2) The maximum voltage a dielectric material can withstand without breaking down

Explanation:

Dielectric Strength is a key property of insulating (dielectric) materials and is defined as:

• The maximum electric field (or voltage per unit thickness) that a material can withstand without electrical breakdown.

• It is typically expressed in kV/mm or V/mil.

When the dielectric strength is exceeded:

• The material loses its insulating properties

• It allows current to pass, resulting in dielectric breakdown

Option Analysis

• 1) Electrical conductivity under stress – Conductivity is the opposite of insulation.

• 3) Amount of heat tolerated before melting – Refers to thermal properties, not dielectric.

• 4) Resistance to thermal expansion – Describes mechanical/thermal property, not electrical insulation.