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Chemical Effects Of Electric Current

Question
CBSEENSC8005902
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A student staying in a coastal region tests the drinking water and also the sea water with a circuit in which a part of the connecting wire is wound around a match box containing compass. He find that the compass needle deflects more in the case of sea water. Explain the reason.

Solution

Sea water contains a large amount of dissolved salts in it. Due the presence of a large amount of dissolved ions, sea water conducts electricity. 

Drinking water contains only a small amount of dissolved salt in it.

The greater electric current passing through sea water produces stronger magnetic field in wire and hence deflects the compass needle more. 

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