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Although ordinary rubber is an insulator...

Although ordinary rubber is an insulator, the special rubber tyres of aircraft are made slightly conducting. Explain why.

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The aircraft while in motion gets charged due to atmospheric air friction. The continuous charging may raise the sharp conducting metal parts to discharge state which will cause spark and even explosion. If the tyres are made conducting, charge will be collected to the tyres and at the time of launching it may safely get discharged to the ground.
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