Which outcome occurs when exceeding the dielectric breakdown voltage in coaxial cable?

💡 Explanation

Exceeding the dielectric strength causes insulation breakdown because applied voltage generates an electric field surpassing the dielectric's withstand limit, triggering destructive discharge. This dielectric breakdown creates a conductive path, thus permanent failure, therefore 'insulation failure', rather than 'impedance decreases' if the dielectric wasn't compromised.

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