Physics · Electrostatic Potential

The dielectric strength of dry air is approximately \( 3 \times 10^6\text{ V}\cdot\text{m}^{-1} \). The maximum potential difference that can be maintained between two parallel plates separated by an air gap of \( 2\text{ mm} \) without dielectric breakdown is:

1. A
   \( 1.5\text{ kV} \)
2. B
   \( 6\text{ kV} \)
3. C
   \( 60\text{ kV} \)
4. D
   \( 15\text{ kV} \)