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The undesirable property of an electrical insulating material is

1. high dielectric strength
2. high relative permittivity
3. high thermal conductivity
4. high insulation resistivity

Correct answer: high relative permittivity

Solution

High relative permittivity indicates that a material can store more electric charge, which can lead to increased leakage currents and reduced effectiveness as an insulator, making it undesirable for electrical insulating applications.

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