When we remove polyester or woollen cloth in dark, we can see sparkand 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
The polyester or woolen cloth get rubbed with inner shirt and due to friction among these static charge gets accumulated on polyester or woolen cloth. This static charges get discharges while removing polyester or woolen cloth causing sparks and crackling sound.

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