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Grade:12

1 Answers

Ashwin Muralidharan IIT Madras
290 Points
12 years ago

Hi Llyod,

 

A switch effectivel creates a potential difference when it is switched off.  Due to the PD, the air molecules are ionised and spark is generated.

 

Hope it helps.

 

Best Regards,

Ashwin (IIT Madras).

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