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[Solved] Why the amount of positive charges on the glass rod is equal to the amount of negative charges on the silk cloth after rubbing them with each other?

  

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Why the amount of positive charges on the glass rod is equal to the amount of negative charges on the silk cloth after rubbing them with each other?

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A positive charge is a deficiency of electrons and a negative charge is an excess of electrons. So when the glass is rubbed with silk, glass loses electrons to be become positively charged. On the other hand silk gains the electrons lost by the glass to become negatively charged.

The silk gains the same number of electrons as the ones lost by the glass. This means that the deficiency of electrons on the glass is the same magnitude as excess of electrons on the silk.

Therefore the positive charge on the glass is equal to the negative charge on the silk.

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