Why does electric discharge in lightning occur if air is a bad conductor?

Air becomes a very good conductor when lightning occurs.

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The magnitude of accumulated charges in clouds is very high

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Water particles in the air help in the flow of charges.

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Winds help in improving the conductivity of air.

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Solution

The correct option is B The magnitude of accumulated charges in clouds is very high
When the amount of the accumulated charges becomes very large, air which is normally a poor conductor of electricity is not able to resist their flow. Thus, charges discharge through the air during lightning.

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