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<p><a href="page.php?w=thunder">thunder</a>, is an example of a large-scale ESD event), but also less dramatic forms, which may be neither seen nor heard, yet still be large enough to cause damage to sensitive electronic devices. Electric sparks require a field strength above approximately 4 million V/m in air, as notably occurs in lightning strikes. Similar forms of <a href="page.php?w=electric_discharge">electric discharge</a> include <a href="page.php?w=corona_discharge">corona discharge</a> from sharp electrodes, <a href="page.php?w=brush_discharge">brush discharge</a></p><p>
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