7. Assertion : The lower end of the lightning conductor is made up of a flat thick metal surface. Reason : It provides a safe and easy passage for the flowing charges.
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We know that surface density of charge is very large on the sharp ends of a conductor. This charge from pointed ends sets up a charged electric wind. This charged electric wind comes in contact with the charged cloubs and then source of its building neturalised and so potential drops between building is reduced. Even if lightning strikes the building, charge is conducted by the lightning conductor to the earth and there is no harm to building.
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