Q. 43.8( 154 Votes )

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Answer :

Sweater is made of wool and generally shirt we wear is a combination of cotton with some synthetic fibers. The rubbing of sweater and the shirt causes a friction between the shirt and sweater. This results in building up of electric charge. When enough charge has been accumulated, while taking off the sweater it discharges and transfer of electrons take place through air in the forms of spark and sound energy is released. Thus, we hear the crackling sound 

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