St. Elmos fire, electrical discharges, generated by low-radius outlines, whereas the more larger radius,outlines emit no discharges.

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Photo credit: © Kim Christensen / Alamy / Afripics
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Keywords: charge, coulomb, curvature, demonstration, density, discharge, education, electric, elerical, elmos, field, fire, grade, outlines, potential, radius, science, sct, spikes, surface, towers, university