Question

The plate of earthing is surrounded by a mixture of ___________ to make a good earth connection. Fill in the blank.
A. Salt
B. Charcoal
C. Both
D. None of the above.

Answer 1

Hint: Earthing protects electrical and electronic components which return the excess current to the neutral point. It is preventing electrical components from high levels of current.

Complete step by step answer:
Earthing is giving protection against electric shock. For an effective earthing the earth resistance must be low as possible. Earthing is protected from leakage currents due to improper insulation of the wire, earthing completes their circuit through the earth wire.
Earthing provides the current, going back to the neutral point of the transformer from which the house is getting the electric supply. Now more than $90\,\% $of the resistance of electrodes to earth is due to the earth within a few feet surrounding it.
So, earthing is accumulated by charcoal and salt which is used for lower resistance. Generally, the earth pit is filled with clay, and the surroundings covered by the charcoal and the salt layer. During the earthing, we should have to select the position where the electrode is dipped in the soil. Soft clay with a low resistivity is more than the resistance of electrodes to the earth.
Therefore, from the above options, option C is correct.

Note: In the process of earthing, electrodes are surrounded by a lower resistive element which makes a good earth connection. Gravel is also used for earthing because it is also a lower resistive element. If we don’t provide the earthing connection to the components, the component fails due to the high current.