The dielectric strength of air is . . . . . . .
- A$3 \times 10^9 \frac{V}{cm}$
- B$3 \times 10^6 \frac{V}{m}$
- C$3 \times 10^9 \frac{V}{\mu m}$
- D$3 \times 10^9 \frac{V}{m}$
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