Sometimes a crackling sound is heard while taking off a sweater during winters. Explain.

Sweater is made of wool and generally shirt we wear is made of cotton blended with some synthetic fibers. Constant friction between the shirt and sweeter lets transfer of electrons from one material to the other. This results in building of electric potential. When enough potential has been accumulated, while taking of the sweater it discharges and transfer of electrons take place. Passage of electrons through air in the forms of spark let out heat and sound energy. Thus we hear the crackling sound and in dark rooms we may see the spark lights as well.  

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 The clothes get charged due to rubbing with other clothes worn inside them. So, when we take them off, we hear some crackling sounds.

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When we take off the sweater , and gets rubbed. While getting rubbed due to friction it gets charged.Thus we hear a crackling sound while taking it off.

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because of accumilation of charges due to rubbing between body and sweater. thumbssss up plz

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