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



A sweater is made up of wool. 

When we take off a woollen sweater, it rubs against our body or the shirt we are wearing.

This rubbing produces opoosite electric charges

Thus, the discharge of these electric charges produces a crackling sound

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.