Question

Air is a poor conductor of electricity. but you may have also read the during lightning,an electric current passes through air. How is it possible? what important result you can conclude regarding the insulators from the above case?

Answer 1

Lghtening is an electric discharge between clouds and earth surface that takes place due to the development of electric charges on the clouds.

when there is quick charge on the clouds is very large the voltage between the clouds and Earth's surface become so high that electric current pass through air.

From the above case we can conclude that under summer special conditions materials classified as poor conductors also allow electricity to pass through them.


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Answer 2

$\huge \tt\red {Question :}$

Air is a poor conductor of electricity. but you may have also read the during lightning,an electric current passes through air. How is it possible? what important result you can conclude regarding the insulators from the above case?

$\huge \tt\red{Answer :-}$

$\huge \green\star$ With a lightning strike, the charge separation in distance between the cloud and the ground (or another part of the same cloud, a different cloud, or sometimes just a different region of air) is very large.

$\huge \green\star$ In order for the charge to equalise over this great distance of insulating air, the charge differences between the cloud and the area that it equalises to also have to be very large.

$\huge \green\star$The breakdown begins when a small channel of ionised air known as a charged leader extends from the charged cloud towards the region of opposite charge.

$\huge \green\star$This can travel fairly slowly and is faint relative to the later lightning strokes.

$\huge \green\star$The charged leader extends further and further from the cloud becoming a stepped leader and as it does so, similar leaders begin to extend towards the cloud from the region of opposite charge.

$\huge \green\star$Eventually, the charged leader from the cloud will meet either a leader from the region of opposite charge or perhaps just the region itself and the circuit is complete.

$\huge \green\star$There is now a channel of ionised air between the 2 charged regions, allowing the flow of charge from one to the other.

$\huge \green\star$This resulting enormous movement of electrons is known as the return stroke and is the first bright flash of lightning that usually see.

$\huge \green\star$The charged regions can continue to use the ionised channel to equalise the charge between the regions, which can result in a lightning strike consisting of multiple strokes as the charge in different regions is equalised through the channel.

$\huge \blue\rightarrow$This is why lightning appears to flicker when you watch it.