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Lightning is a huge spark caused by electric discharge taking place between
Clouds
Within the same cloud
Cloud and earth
Any of above
Any of above
Lightning is a high-voltage electrostatic discharge occurring due to the accumulation of electrical charges in the atmosphere. This discharge can occur between different clouds (inter-cloud), within the same cloud (intra-cloud), or between a cloud and the Earth, acting as a massive spark to neutralize potential differences.
Lightning is a high-voltage electrostatic discharge occurring due to the accumulation of electrical charges in the atmosphere. This discharge can occur between different clouds (inter-cloud), within the same cloud (intra-cloud), or between a cloud and the Earth, acting as a massive spark to neutralize potential differences.
E=dVтАЛ тАФ electric field intensity required for dielectric breakdown
Q=CтЛЕV тАФ charge stored in the cloud-earth capacitor system
Charge separation occurs within a cumulonimbus cloud due to collisions between ice crystals and graupel, causing positive charges to accumulate at the top and negative charges at the base. Once the electric field strength exceeds the dielectric breakdown strength of air (approx. 3├Ч106V/m), an ionized path called a 'stepped leader' is formed. The rapid flow of charge to neutralize this potential results in the luminous flash known as lightning.
Lightning is essentially a massive natural capacitor discharging its stored energy.
The breakdown strength of dry air is approximately 30,000V/cm.
Cloud-to-cloud lightning is more common than cloud-to-ground lightning globally.
Fixes atmospheric nitrogen into the soil (nitrates) which aids plant growth.
Regulates the global electrical circuit of the Earth.
Causes significant damage to power transmission systems and infrastructure.
High risk of fire and catastrophic damage to sensitive electronic equipment.
Surge protection device (SPD) testing
Grounding system design validation
Lightning follows the path of least electrical resistance or impedance.
Option D is the correct choice because the physics of charge neutralization applies to any potential difference between two conducting regions, regardless of their nature (cloud or ground).
D is correct тАФ lightning occurs as a result of potential equalization between any two points of opposite polarity in the atmosphere-earth system.
In power systems, remember that lightning strikes induce high-frequency travelling waves (transients), typically represented by the standard 1.2/50╬╝s wave shape in insulation coordination tests.