A spark occurs at the tip of a metal needle if the electric field strength exceeds 3.0
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A spark occurs at the tip of a metal needle if the electric field strength exceeds 3.0 × 106 N/C, the field strength at which air breaks down. What is the minimum surface charge density for producing a spark?
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Related Book For 
Physics for Scientists and Engineers A Strategic Approach with Modern Physics
ISBN: 978-0133942651
4th edition
Authors: Randall D. Knight
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