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What potential difference across a 1 cm air gap reaches air's breakdown field?
A3 × 10⁸ V
B3 × 10² V
C3 × 10⁴ V
D3 × 10⁶ V
Answer & Solution
Correct answer: C. 3 × 10⁴ V
V = E d = 3×10⁶ V/m × 0.01 m = 3×10⁴ V.
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