Answer / promise mbanga

Looking at this question from the chemistry point of view,
l can confidently say:

(i) Coal in form of graphate, is a good conductor of
electricity due to a free electron wondering around it's
bonds, hence the resitance of earth reduces due to the
presents of coal.

(ii) Salt in solution for does ionise to Na+ and Cl-
ions. These ions are good conductors of electricity, hence
the earth resistance does reduces when salt is present on
earth.

(iii) Water does partially ionise to give H3O+ and OH- ions
which conduct electricity. This also reduces the earth's
resistance.

Answer / ankush miglani

the hard water is one of the good conductor of elecricity
as explained in ship earthing.
the mixing of these things in earth makes the earth
conductive n hence reduces the earth resistance.

Answer / gkumar

Hi,
Both coal & salt acts as good conductor of electricity .
also when they are mixed & put in the earthing pit they
provide conductivity as well as moisture for better passage
of current

Answer / p mishra

Coal are the form of graphite which is a best conductor.So
for reducing the earth resistance we use coal.Like salt is
made of Na+ Cl-.These ions are good conductors of
electricity, hence the earth resistance does reduces when
salt is present on earth. Water conducts partially. So all
the materials when mixed the resistance/ohmic value is
reduced.

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