Lightning can occur between a charged cloud and the Earth’s surface when the electric field strength in the intervening atmosphere reaches $25kN{C^{ - 1}}$. The diagram shows the electric field between the base of a cloud and the Earth’s surface.
What is the minimum potential difference between the Earth and the base of a cloud, 2 km high, for lightning to occur?
1 )
12.5 MV
2 )
25 MV
50 MV
4 )
100 MV
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