We have seen in the earlier chapter how a rich negative ion field can be created by using crystal plates.
You should now know something about ions and their effects on us. The atmosphere surrounding us contains electrically-charged particles which can be either positively charged or negatively charged. These are called positive ions and negative ions [...]

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Crystals which are found in Nature have certain unique properties which have helped in the growth of the Electronics industry enormously.
A class of crystals called the piezo electric crystals produce electricity when they are subjected to mechanical stress. Similarly if an electrical field is applied, the crystal exhibits mechanical stress.
This property of the crystal is [...]

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