When we remove polyester or woolen cloth in dark, we can see spark and hear a cracking sound. These are due to

static electricity

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current electricity

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reflection of light

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refraction of light

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Solution

The correct option is A static electricity
When we wear polyester or woolen cloth for a period , charge is stored in cloth due to friction from dry skin , called static electricity . When we remove cloth , this static charge discharges in the surrounding in the form of light and sound , resulting in spark and cracking sound .

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