Answers

2015-05-13T22:48:16+05:30
The answer is Static electricity ,when we walk on the carpet their prevails a current of static nature which wants to get earthed so when you touch a metal knob or any other conducting material the static charge from your body enters the conductor and you feel a spark 
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  • Brainly User
2015-05-14T09:58:30+05:30
Due to electricity because of the sudden actiuon of charge trasfer from one body to another 
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