When a plastic scale rubbed on dry hair is kept close to small paper pieces, it attracts the paper pieces. When the rubbed portion of scale is touched with hand, the pen looses attractive nature. Give reason for this.

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Solution

When rubbed on dry hair, the plastic scale acquires charges, that exerts force on paper pieces and attract them. As soon as we touch the scale, the scale lose charge to the earth through our body. We say that the foil strips are discharged. As there is no charge, it looses the attractive nature.

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