Lightning conductor
This is a simple device used to
protect tall buildings from the lightning.
It consists of a long thick copper rod passing through the building to ground.
The lower end of the rod is connected to a copper plate buried deeply into the
ground. A metal plate with number of spikes is connected to the top end of the
copper rod and kept at the top of the building.
When a negatively
charged cloud passes over the building, positive charge will be induced on the
pointed conductor. The positively charged sharp points will ionize the air in
the vicinity. This will partly neutralize the negative charge of the cloud,
thereby lowering the potential of the cloud. The negative charges that are attracted to the
conductor travels down to the earth. Thereby preventing the lightning stroke
from the damage of the building
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