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NCERT Solutions Class 8 Science Solutions for Exercise in Chapter 14 - Chemical Effects and Electric Current
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A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
Answer:
The amount of dissolved salts present in the seawater is more than that of the drinking water. So, the sea water will be a better conductor than the drinking water. That is the reason behind the increased deflection of the needle in the seawater when compared with the drinking water.
Video transcript
"hello students my name is pramit singh
and i welcome you all to lido learning
homework
one of india's best online classes now
today in this video
we have a question that is based on the
concept
of conductivity of water and sea water
the question says a child staying in a
coastal region
tests the drinking water and also the
sea water
with his tester so basically
we have drinking water
and we have sea water
he finds that the compass needle
deflects more in case of sea water
can you explain the reason now as you
know sea water is basically what that
consists
dissolved salts in it so the dissolved
salts or the amount of the dissolved
salt
present in the sea water is more than
that of the drinking water
sea water will consist of more amount of
dissolved salt than
drinking water so sea water will be a
better conductor
so obviously sea water will be a better
conductor
of electricity than the
drinking water so that's why that is the
reason behind the
increased deflection of the needle so if
you bring the compass needle near it
so obviously the sea water will deflect
the needle
more when compared with the drinking
water because sea water consists of more
amount of salts as compared to drinking
water
so i hope you have understood the
concept very clearly but still if you
have any doubt
do comment in the comment box and please
like and subscribe our channel for lido
thank you
"
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