Question

sometimes a crackling sound is heard while taking off a sweater during winters
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Answer 1

Answer:

It is because the particles in sweater are in rest and when we pull it out then, the external force is exerted on sweater. So because of the particles,the particles comes in motion. So, we hear a crackling sound.

Explanation:

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Answer 2

When a sweater is taken off. the woolen sweater gets charged because of the friction between your hands and the sweater { electro static } ....................