What is the purpose of using charcoal and salt mixture near the copper plate that is buried in the ground?

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Solution

The layer of charcoal and salt helps to maintain low resistance to earth fault currents.
Because of the ionic behaviour of salt and charcoal, they will maintain moisture.
Charcoal is used to retain the moisture for a long duration because it is an adsorbent and salt is added to increase the conductivity both these products help to pass the leakage current through earth wire as early as possible to remove the chances of shock.

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