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 matchbox containing compass. He finds that the compass needle deflects more in the case of sea water. Can you explain the reason ?

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Solution

Sea water contains a large amount of dissolved salts in it. Due to the presence of a large amount of dissolved salts in it, sea water is a much better conductor of electricity than drinking water (which contains only a small amount of dissolved salts 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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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?

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?