When we remove polyester or woollen clothes in dark, we can see a spark and hear a crackling sound. Which of the following is responsible for it?

Static electricity

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Convection

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Potential difference

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Radiation

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Solution

The correct options are
A
Static electricity

C
Potential difference

The sparks and crackling sound are due to the discharging of static electricity. When there is enough potential difference, transfer of charges occur with light and sound. Woollen clothes get charged easily and while we remove them, the transfer of charge from woollen clothes to our hair or body takes place. This transfer of charge is what causes the spark and sound.

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