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It is because there are a build up of electrons on a material. If it is static it can be plastic or paper etc . The electrons are surplus to atomic requirements of the material so a negative charge will build up. If the charge is big enough the electrons will try and find a positive source to neutralise the charge. The only thing stopping it from doing so is the insulating material such as air

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13y ago
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Q: Why does an electric discharge occur?
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