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1. Dielectric strength of air is 3 × 10^6 V/m. What does it mean?

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1. Dielectric strength of air is 3 × 106 V/m. What does it mean?

2. High power lines cannot be insulated. Why?

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1. When electric field on air exceeds the 3 × 106 v/m, air becomes conductor and conduct electricity.

2. Insulator shows conducting property at high voltage.

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