A crackling sound is heard while taking off sweater during winters. Explain the reason behind this.
Updated 1/12/2026
What is pressure? How is pressure related to the surface area on which it acts?
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Why a copper rod cannot be charged by friction, if held by hand?
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Why Porters wear turbans when they have to carry heavy loads on their heads?
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Describe coal and its various products along with their uses.
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